A method, system and medium for controlling the discharge of medical radioactive waste liquid

Abstract

The present invention relates to the technical field of emission control, and in particular to an emission control method, system and medium for medical radioactive waste liquid, which are applied to N decay tanks connected in sequence, wherein valves are arranged at the ends of the N decay tanks; the method comprises: averaging a plurality of actual emission amounts and adding a redundant emission amount to obtain an expected emission amount; calculating the capacity of a single decay tank and the divisor of the expected emission amount, and determining an ideal temporary storage period according to the decay time threshold, the divisor and the emission period; determining an initial temporary storage period of the decay tank according to the activity range of the decay tank, adjusting the radioactive waste liquid in the decay tank within the activity range of the decay tank, so as to adjust the initial temporary storage period of the decay tank to an ideal temporary storage period; controlling the N decay tanks to sequentially open corresponding valves every other ideal temporary storage period to discharge the radioactive waste liquid; the present invention can improve the emission efficiency of radioactive waste liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of emission control, and in particular to an emission control method, system and medium for medical radioactive waste liquid. Background Art

[0002] Traditional methods for treating medical radioactive waste liquid usually use multiple decay tanks alternately, and manually monitor and control the liquid level to achieve step-by-step treatment of the waste liquid. However, this method has the problems of complex operation and low efficiency.

[0003] When designing the volume of the attenuation tank, an assessment is usually made based on the number of patients treated in the nuclear medicine department, the amount of radionuclides used, and the amount of wastewater generated. However, this assessment method makes it difficult to predict the subsequent treatment capacity of radioactive waste liquid. When the treatment capacity of radioactive waste liquid fluctuates greatly, if reasonable emission control is not carried out, it may lead to a shortage of attenuation tank capacity, affecting the discharge of radioactive waste liquid. Summary of the invention

[0004] The present invention aims to provide a method, system and medium for controlling the discharge of medical radioactive waste liquid, aiming to improve the discharge efficiency of radioactive waste liquid by dynamically adjusting the radioactive waste liquid in each decay tank.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a method for controlling the discharge of medical radioactive waste liquid, the method being applied to N decay tanks that are connected in sequence and have the same capacity, and valves are provided at the ends of the N decay tanks; N is an integer greater than 3;

[0007] The method comprises the following steps:

[0008] S100, obtaining actual discharge amounts of radioactive waste liquid in multiple past discharge cycles, averaging multiple actual discharge amounts and adding redundant discharge amounts to obtain an estimated discharge amount;

[0009] S200, obtaining a preset decay time threshold, calculating the capacity of a single decay tank and the divisor of the expected emission, and determining an ideal temporary storage period according to the decay time threshold, the divisor and the emission period; wherein the sum of N ideal temporary storage periods is greater than the preset decay time threshold;

[0010] S300, determining the activity ranges of the N decay slots, and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots; wherein the activity ranges of the N decay slots are determined according to a preset critical nuclide activity threshold;

[0011] S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period;

[0012] S500, every ideal temporary storage period, controlling the N decay tanks to open corresponding valves in sequence to discharge the radioactive waste liquid.

[0013] Optionally, in S200, determining the ideal temporary storage period according to the decay time threshold, the divisor and the emission period includes:

[0014] Determine whether the product of the divisor and the emission period is greater than the decay time threshold. If so, take the product of the divisor and the emission period as the ideal temporary storage period; otherwise, divide the decay time threshold into N equal parts as the ideal temporary storage period.

[0015] Optionally, in S300, determining the activity ranges of the N decay slots, and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots, includes:

[0016] S310, obtaining a critical nuclide concentration threshold for the radioactive waste liquid to meet the discharge standard, and multiplying the critical nuclide concentration threshold by the volume of a single decay tank to obtain a critical nuclide activity threshold;

[0017] S320, numbering the N decay tanks according to the discharge order of the radioactive waste liquid, and setting the activity range of the i-th decay tank to [exp(Ni)·Rth, exp(N-i+1)·Rth); wherein i=1, 2, 3, ..., N; and Rth is the activity threshold of the key nuclide;

[0018] S330, predicting an initial temporary storage period of the decay tank according to the activity range of the decay tank.

[0019] Optionally, in S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period includes:

[0020] S410, for N attenuation slots, obtaining an ideal temporary storage period and a minimum activity range of the attenuation slot;

[0021] S420, determining an ideal activity of the decay tank according to an ideal temporary storage period of the decay tank and a minimum value of the activity range, so that the radioactive activity of the decay tank is reduced to the minimum value of the activity range of the decay tank within the ideal temporary storage period;

[0022] S430, obtaining the current radioactivity of the decay tank, and adjusting the radioactive waste liquid in the decay tank according to the current radioactivity of the decay tank and the ideal activity.

[0023] Optionally, in S430, adjusting the radioactive waste liquid in the decay tank according to the waste liquid adjustment volume of the decay tank includes:

[0024] S431, within the current ideal temporary storage period, obtaining the current radioactivity activities of N decay tanks, determining the activity difference of the decay tank according to the current radioactivity activities of the decay tank and the ideal activity, and determining the waste liquid adjustment volume of the decay tank according to the activity difference of the decay tank and the volume of the radioactive waste liquid in the decay tank, wherein the waste liquid adjustment volume is the volume of the radioactive waste liquid that needs to be adjusted in the decay tank;

[0025] S432, for the i-th decay slot, calculate the time difference between the initial temporary storage period and the ideal temporary storage period of the decay slot, and determine whether the time difference is a positive number. If so, record the decay slot as a discharge slot; if not, record the decay slot as a holding slot;

[0026] S433, traverse the N decay slots in descending order of the decay slot numbers, and for the i-th decay slot, determine whether the decay slot is the first decay slot, if so, execute S436; if not, execute S434;

[0027] S434, determine whether the i-th decay slot is a holding slot, if so, execute S435; if not, update i=i-1 and execute S433;

[0028] S435, determine whether the i-1th decay slot is a holding slot, if so, update i=i-1, and execute S433; if not, execute S436;

[0029] S436, obtaining the remaining capacity Vi of the i-th holding tank and the waste liquid adjustment volume ΔV(i-1) of the i-1-th decay tank, and taking min(Vi,ΔV(i-1)) as the total receiving volume δi of the i-th decay tank; wherein min() indicates taking a smaller value;

[0030] S437, controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total receiving amount δi;

[0031] S438, determining the current remaining temporary storage time of the N attenuation slots. If it is determined that the time deviations of the current remaining temporary storage time of the N attenuation slots and the ideal temporary storage period are both within the time deviation threshold range, then the process ends; otherwise, after the current ideal temporary storage period ends, the process executes S431.

[0032] Optionally, in S437, controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total received amount δi includes:

[0033] S4371, obtaining the radioactivity R(i-1) of the i-1th decay tank, the volume of radioactive waste liquid V(i-1) of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank, and determining the instantaneous received dose Δδi of the i-th decay tank according to the radioactivity R(i-1) of the i-1th decay tank, the volume V(i-1) of radioactive waste liquid of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank;

[0034] S4372, determine the total receiving amount δi and the instantaneous receiving amount Δδi of the i-th decay slot, if δi>Δδi, execute S4373; if δi≤Δδi, execute S4374;

[0035] S4373, obtaining the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, and the radioactivity R(i) of the ith decay tank, and determining the estimated waiting time Δti for the ith decay tank to receive the radioactive waste liquid according to the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, the total receiving amount δi of the ith decay tank, and the radioactivity R(i) of the ith decay tank;

[0036] S4374, determine the estimated waiting time Δti and the ideal temporary storage period ti, if Δti>ti, execute S4375; otherwise, execute S4376;

[0037] S4375, controlling the i-th decay tank to receive the i-1-th decay tank and discharge the radioactive waste liquid according to the instantaneous receiving amount Δδi;

[0038] S4376, after the expected waiting time Δti, control the i-th decay tank to receive the i-1-th decay tank to discharge the radioactive waste liquid according to the total received amount δi.

[0039] In a second aspect, an embodiment of the present invention provides a discharge control system for medical radioactive waste liquid, the system comprising:

[0040] at least one processor;

[0041] at least one memory for storing at least one program;

[0042] When the at least one program is executed by the at least one processor, the at least one processor implements the method for controlling the discharge of medical radioactive waste liquid as described in any one of the first aspects.

[0043] In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method for controlling the discharge of medical radioactive waste liquid as described in any one of the first aspect.

[0044] The beneficial effects of the present invention are as follows: the present invention discloses a discharge control method, system and medium for medical radioactive waste liquid. The present invention obtains the expected discharge amount by averaging multiple actual discharge amounts and adding redundant discharge amounts; then calculates the capacity of a single decay tank and the divisor of the expected discharge amount, and determines the ideal temporary storage period according to the decay time threshold, the divisor and the discharge period; thereby obtaining an ideal temporary storage period that meets the discharge requirements and has a higher discharge efficiency; then determines the initial temporary storage period of the decay tank according to the activity range of the decay tank, and adjusts the radioactive waste liquid in the decay tank within the activity range of the decay tank to adjust the initial temporary storage period of the decay tank to the ideal temporary storage period; finally, every other ideal temporary storage period, controls N decay tanks to open the corresponding valves in turn to discharge the radioactive waste liquid. The present invention can achieve the goal of minimizing the temporary storage time and improve the discharge efficiency of radioactive waste liquid by dynamically adjusting the remaining capacity of each decay tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 It is a schematic flow chart of a method for controlling discharge of medical radioactive waste liquid in an embodiment of the present invention;

[0047] Figure 2 is a schematic diagram of a scenario of a method for controlling discharge of medical radioactive waste liquid in an embodiment of the present invention;

[0048] Figure 3 It is a schematic diagram of the structure of the discharge control system of medical radioactive waste liquid in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0050] See also Figure 1 and Figure 2 , Figure 1 It is a flow chart of a method for controlling the discharge of medical radioactive waste liquid provided by the present invention, wherein the method is applied to N decay tanks that are connected in sequence and have the same capacity, and valves are provided at the ends of the N decay tanks; N is an integer greater than 3;

[0051] The method comprises the following steps:

[0052] S100, obtaining actual discharge amounts of radioactive waste liquid in multiple past discharge cycles, averaging multiple actual discharge amounts and adding redundant discharge amounts to obtain an estimated discharge amount;

[0053] Specifically, setting the redundant emission amount can take into account the fluctuation of the actual emission amount, so as to facilitate the subsequent more reasonable determination of the ideal temporary storage period; the size of the redundant emission amount is set according to the actual situation, for example, the redundant emission amount is set to the average deviation of multiple actual emissions, or directly set to: redundant emission amount = the average value of multiple actual emissions * 0.2 based on experience.

[0054] S200, obtaining a preset decay time threshold, calculating the capacity of a single decay tank and the divisor of the expected emission, and determining an ideal temporary storage period according to the decay time threshold, the divisor and the emission period; wherein the sum of N ideal temporary storage periods is greater than the preset decay time threshold;

[0055] Specifically, the activity range of the decay tank is input into the activity decay model to predict the decay time threshold; the mathematical expression of the activity decay model is: R(t)=R·exp(-k·t); wherein t is the decay time threshold, R(t) is the minimum value of the activity range, R is the maximum value of the activity range, k is the decay constant, and e is the base of the natural logarithm.

[0056] The capacity of a single decay tank and the divisor of the expected emission volume can reflect the maximum number of emissions that can be met when a single decay tank is used to discharge radioactive waste liquid according to the expected emission volume; combining the decay time threshold, the divisor and the emission period, an ideal temporary storage period greater than the decay time threshold can be determined, and the ideal temporary storage period for each decay tank is the same.

[0057] S300, determining the activity ranges of the N decay slots, and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots; wherein the activity ranges of the N decay slots are determined according to a preset critical nuclide activity threshold;

[0058] In the relevant technology, medical radioactive waste refers to liquid, solid and airborne wastes generated in the medical practice of applying radioactive nuclides, whose radioactive specific activity or radioactive concentration exceeds the relevant national regulations. The most common radioactive nuclides in hospital radioactive waste liquid include: technetium-99m, fluorine-18, iodine-131, etc. Most of them are short half-life nuclides with low radioactive specific activity. Among them, the half-life of technetium-99m (Tc-99m) is 6.02 hours. This is a radioactive isotope widely used in nuclear medicine, known for its ideal half-life and single gamma ray characteristics. The half-life of fluorine-18 (F-18) is about 110 minutes, and the half-life of iodine-131 (I-131) is about 8 days. During the decay process, radioactive waste will produce alpha rays, beta rays, and gamma rays, which are harmful to human tissues and organs. The radioactive concentration of total alpha rays at the discharge port of radioactive waste liquid shall not exceed 1Bq / L, the radioactive concentration of total beta rays shall not exceed 10Bq / L, and the radioactive concentration of iodine-131 shall not exceed 10Bq / L. Based on the emission standard of radioactive concentration, combined with the volume of a single decay tank, the activity threshold of key nuclides can be pre-set to determine the activity range of N decay tanks.

[0059] S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period;

[0060] It should be noted that radioactive waste liquid usually needs to be stored and decayed for ten half-lives before radiation level testing. If it meets the emission standards, it can be treated and discharged as general waste. Assuming that four decay tanks are used, the discharge cycle of the radioactive waste liquid is 1 day, the half-life is about 8 days, and the maximum temporary storage time set according to the half-life is 8 days, 4 days, 2 days, and 1 day, respectively. This will lead to a shortage of capacity in the front decay tank. When the front decay tank cannot accommodate more radioactive waste liquid, the radioactive waste liquid will accumulate in the front decay tank. If the radioactive waste liquid in the front decay tank is arbitrarily discharged into the rear decay tank, it will cause confusion in the discharge time. In this embodiment, by adjusting part of the radioactive waste liquid in the front decay tank to the rear decay tank, the radioactivity of each decay tank is adjusted, that is, the initial temporary storage cycle of each decay tank is adjusted. For example, the ideal temporary storage cycle of the four decay tanks is adjusted to 4 days, which can balance the discharge time intervals of each decay tank, so as to achieve the effect of one in and one out of the decay tank during the discharge cycle of the radioactive waste liquid; at the peak period of the radioactive waste liquid, sufficient residual capacity can also be reserved without affecting the overall discharge time.

[0061] S500, every ideal temporary storage period, controlling the N decay tanks to open corresponding valves in sequence to discharge the radioactive waste liquid.

[0062] Specifically, every ideal temporary storage period, the N decay tanks are controlled to discharge in sequence according to the order of numbers from large to small. The radioactive waste liquid in the last decay tank is discharged first, and after the last decay tank is emptied, the penultimate decay tank is controlled to discharge, so that the radioactive waste liquid in the N decay tanks is discharged in sequence.

[0063] The present invention can achieve the goal of minimizing the temporary storage time and improve the discharge efficiency of radioactive waste liquid by dynamically adjusting the residual capacity of each decay tank.

[0064] In some embodiments, before S100, the method further includes:

[0065] S110, obtaining the amount of radioactive waste liquid to be discharged Ve and the discharge period, and determining the remaining capacity V1 of the degradation tank and the size of the amount of radioactive waste liquid to be discharged Ve;

[0066] It should be noted that the method in the embodiment of the present invention is applied to a decay pool, and the decay pool includes a plurality of decay tanks connected in sequence;

[0067] The degradation tank in the present invention plays the role of buffering the currently discharged radioactive wastewater; the degradation tank is connected to the first decay tank.

[0068] First, the radioactive wastewater used in medical units is introduced into the degradation tank for preliminary treatment, including the degradation and crushing of solid impurities in the radioactive wastewater; then the treated radioactive waste liquid in the degradation tank is introduced into the decay tank connected to it through a self-priming sewage pump, and then the radioactive waste liquid is discharged step by step by controlling the valves between the two adjacent decay tanks. After the radioactive waste liquid in the last attenuation tank meets the emission index requirements, it is pumped to the sewage treatment station for treatment through a water pump.

[0069] S120: If it is determined that the remaining capacity V1 of the degradation tank is greater than the amount to be discharged Ve, S100 is executed.

[0070] If the remaining capacity V1 of the degradation tank can meet the amount to be discharged Ve, the remaining capacity of each decay tank needs to be reasonably allocated. For the degradation tank, as much remaining capacity as possible should be freed up. For the subsequent decay tanks, the emission time interval between two adjacent decay tanks should be optimized from the corresponding half-life to a multiple of the emission cycle. This can reserve enough remaining capacity to meet the demand for the amount to be discharged Ve as much as possible without affecting the overall emission time.

[0071] In some embodiments, in S200, determining the ideal temporary storage period according to the decay time threshold, the divisor and the emission period includes:

[0072] Determine whether the product of the divisor and the emission period is greater than the decay time threshold. If so, take the product of the divisor and the emission period as the ideal temporary storage period; otherwise, divide the decay time threshold into N equal parts as the ideal temporary storage period.

[0073] Specifically, the ideal temporary storage period selected in this embodiment has a certain redundancy, which can ensure that the radioactivity of the decay tank is reduced to the minimum activity threshold value within the ideal temporary storage period.

[0074] In some embodiments, in S300, determining the activity ranges of the N decay slots, and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots, includes:

[0075] S310, obtaining a critical nuclide concentration threshold for the radioactive waste liquid to meet the discharge standard, and multiplying the critical nuclide concentration threshold by the volume of a single decay tank to obtain a critical nuclide activity threshold;

[0076] Specifically, the discharge of radioactive waste liquid needs to meet the requirements of key nuclide activity threshold, key nuclide concentration threshold and decay time threshold at the same time. The requirements of emission indicators have been taken into account when designing the capacity of the attenuation tank. The radioactivity concentration represents the ratio of the radioactivity of the radioactive waste liquid to the volume of the radioactive waste liquid, and the unit is becquerel per liter (Bq / L). The radioactivity concentration is monitored by high-precision radioactivity monitoring instruments.

[0077] S320, numbering the N decay tanks according to the discharge order of the radioactive waste liquid, and setting the activity range of the i-th decay tank to [exp(Ni)·Rth, exp(N-i+1)·Rth); wherein i=1, 2, 3, ..., N; and Rth is the activity threshold of the key nuclide;

[0078] Specifically, the activity range of each decay slot is determined according to the key nuclide activity threshold, and the activity range of each decay slot is divided based on a half-life.

[0079] S330, predicting an initial temporary storage period of the decay tank according to the activity range of the decay tank.

[0080] Specifically, the initial temporary storage period is predicted by the formula R(i)max=R(i)min·exp(-k·ti); wherein R(i)max is the maximum value of the activity range, R(i)min is the minimum value of the activity range, ti represents the initial temporary storage period, k is the decay constant, and e is the base of the natural logarithm; after the ideal temporary storage period, the radioactivity of the decay tank decreases from the maximum value of the activity range to the minimum value of the activity range.

[0081] In some embodiments, in S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period includes:

[0082] S410, for N attenuation slots, obtaining an ideal temporary storage period and a minimum activity range of the attenuation slot;

[0083] S420, determining an ideal activity of the decay tank according to an ideal temporary storage period of the decay tank and a minimum value of the activity range, so that the radioactive activity of the decay tank is reduced to the minimum value of the activity range of the decay tank within the ideal temporary storage period;

[0084] Specifically, the ideal activity is predicted by the formula R(ti)=R(t0)·exp(-k·ti); wherein t0 represents the current time, R(t0) is the radioactive activity at the current time t0, that is, the ideal activity; ti represents the ideal temporary storage period, R(ti) is the radioactive activity after the ideal temporary storage period, that is, the minimum value of the activity range, k is the decay constant, and e is the base of the natural logarithm; after the decay tank has passed an ideal temporary storage period, the radioactive activity of the decay tank is reduced to the corresponding minimum value of the activity range.

[0085] S430, obtaining the current radioactivity of the decay tank, and adjusting the radioactive waste liquid in the decay tank according to the current radioactivity of the decay tank and the ideal activity.

[0086] Specifically, by adjusting the radioactive waste liquid in the decay tank, the radioactivity of the decay tank can be adjusted to an ideal activity within an ideal temporary storage period, so that after an ideal temporary storage period, the decay tank can be reduced to the minimum value of the corresponding activity range.

[0087] In some embodiments, in S430, adjusting the radioactive waste liquid in the decay tank according to the waste liquid adjustment volume of the decay tank includes:

[0088] S431, within the current ideal temporary storage period, obtaining the current radioactivity activities of N decay tanks, determining the activity difference of the decay tank according to the current radioactivity activities of the decay tank and the ideal activity, and determining the waste liquid adjustment volume of the decay tank according to the activity difference of the decay tank and the volume of the radioactive waste liquid in the decay tank, wherein the waste liquid adjustment volume is the volume of the radioactive waste liquid that needs to be adjusted in the decay tank;

[0089] Specifically, the time when the last decay tank discharged radioactive waste liquid for the last time is obtained as the start time of the current ideal temporary storage period; within the current ideal temporary storage period, the current radioactivity activities of the N decay tanks are obtained, and then the subsequent steps are performed; the activity difference is calculated according to the formula ΔR=R1-R0, and the waste liquid adjustment volume of the decay tank is calculated according to the formula ΔV=ΔR·V0 / R1, wherein ΔV represents the waste liquid adjustment volume, V0 represents the current volume of the radioactive waste liquid, ΔR represents the activity difference, V0 represents the current volume of the radioactive waste liquid, R1 represents the current radioactivity activity, and R0 represents the ideal activity;

[0090] S432, for the i-th decay slot, calculate the time difference between the initial temporary storage period and the ideal temporary storage period of the decay slot, and determine whether the time difference is a positive number. If so, record the decay slot as a discharge slot; if not, record the decay slot as a holding slot;

[0091] Specifically, the time difference = initial temporary storage period - ideal temporary storage period, the decay slot with a positive time difference is recorded as a discharge slot, and the decay slot with a negative time difference is recorded as a holding slot. Since the initial temporary storage periods of the N decay slots are uneven, and the total initial temporary storage period of the N decay slots meets the requirements of the decay time threshold, the ideal temporary storage period can be approximated as the average or median of the N initial temporary storage periods; therefore, the discharge slot and the holding slot must exist at the same time, and the radioactive waste liquid in the discharge slot and the holding slot needs to be adjusted.

[0092] If the initial temporary storage period is less than the ideal temporary storage period, it means that the initial temporary storage period of the corresponding decay tank needs to be shortened, and the radioactive activity in the decay tank needs to be reduced, that is, the radioactive waste liquid needs to be discharged, and the decay tank is recorded as a discharge tank; otherwise, it means that the corresponding decay tank can be temporarily stored for a longer time, that is, the radioactive activity of the decay tank is at a lower level, and it is recorded as a holding tank.

[0093] S433, traverse the N decay slots in descending order of the decay slot numbers, and for the i-th decay slot, determine whether the decay slot is the first decay slot, if so, execute S436; if not, execute S434;

[0094] Specifically, starting from the Nth decay slot, traversing to the first decay slot in sequence, the traversal ends.

[0095] S434, determine whether the i-th decay slot is a holding slot, if so, execute S435; if not, update i=i-1 and execute S433;

[0096] S435, determine whether the i-1th decay slot is a holding slot, if so, update i=i-1, and execute S433; if not, execute S436;

[0097] S436, obtaining the remaining capacity Vi of the i-th holding tank and the waste liquid adjustment volume ΔV(i-1) of the i-1-th decay tank, and taking min(Vi,ΔV(i-1)) as the total receiving volume δi of the i-th decay tank; wherein min() indicates taking a smaller value;

[0098] Specifically, min(Vi,ΔV(i-1)) represents the smaller value of Vi and ΔV(i-1), and the total receiving amount δi of the i-th decay tank cannot exceed its remaining capacity Vi. If ΔV(i-1)>Vi, the radioactive waste liquid of the i-1th decay tank is adjusted during the next cycle control process.

[0099] S437, controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total receiving amount δi;

[0100] Specifically, based on the total received amount δi, the i-1th decay tank is controlled to discharge radioactive waste liquid not exceeding the total received amount δi to the i-th decay tank, thereby ensuring that the i-th decay tank and the i-1th decay tank are both within the corresponding activity range.

[0101] S438, determining the current remaining temporary storage time of the N attenuation slots. If it is determined that the time deviations of the current remaining temporary storage time of the N attenuation slots and the ideal temporary storage period are both within the time deviation threshold range, then the process ends; otherwise, after the current ideal temporary storage period ends, the process proceeds to S431.

[0102] Specifically, the current remaining temporary storage time of the i-1th attenuation slot is calculated according to the formula R(i-1)min=R(i-1)·exp(-k·t(i-1)); wherein t(i-1) represents the current remaining temporary storage time of the i-1th attenuation slot, R(i-1)min represents the minimum value of the activity range of the i-1th attenuation slot, and R(i-1) represents the radioactive activity of the i-1th attenuation slot.

[0103] The duration deviation threshold range is pre-set according to the actual situation, for example, it is set to 2 hours. If the deviation between the current remaining temporary storage time of the decay tank and the duration of the ideal temporary storage cycle is within the duration deviation threshold range, it is an acceptable deviation, indicating that the goal of balanced regulation has been achieved and the cyclic regulation process can be ended. If the regulation cannot be completed in the current ideal temporary storage cycle, the radioactive waste liquid in the decay tank is adjusted again after the subsequent ideal temporary storage cycle arrives, so that each decay tank is gradually adjusted to the ideal activity.

[0104] In some embodiments, in S437, controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total received amount δi includes:

[0105] S4371, obtaining the radioactivity R(i-1) of the i-1th decay tank, the volume of radioactive waste liquid V(i-1) of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank, and determining the instantaneous received dose Δδi of the i-th decay tank according to the radioactivity R(i-1) of the i-1th decay tank, the volume V(i-1) of radioactive waste liquid of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank;

[0106] Specifically, the instantaneous received amount Δδi is calculated according to the formula R(i-1)·Δδi / V(i-1)=R(i)max-R(i), where R(i)max represents the maximum value of the activity range of the i-th decay slot; since the instantaneous received amount is relative to the i-th decay slot, the instantaneous received amount is numbered i.

[0107] S4372, determine the total receiving amount δi and the instantaneous receiving amount Δδi of the i-th decay slot, if δi>Δδi, execute S4373; if δi≤Δδi, execute S4374;

[0108] S4373, obtaining the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, and the radioactivity R(i) of the ith decay tank, and determining the estimated waiting time Δti for the ith decay tank to receive the radioactive waste liquid according to the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, the total receiving amount δi of the ith decay tank, and the radioactivity R(i) of the ith decay tank;

[0109] Specifically, the estimated waiting time Δti is calculated according to the formula R(i-1)·(1-exp(-k·Δti))·δi / V(i-1)=R(i)·exp(-k·Δti).

[0110] S4374, determine the estimated waiting time Δti and the ideal temporary storage period ti, if Δti>ti, execute S4375; otherwise, execute S4376;

[0111] S4375, controlling the i-th decay tank to receive the i-1-th decay tank and discharge the radioactive waste liquid according to the instantaneous receiving amount Δδi;

[0112] Specifically, if the expected waiting time Δti exceeds the size of the ideal temporary storage period ti, it means that the current discharge cycle cannot adjust the radioactive waste liquid in the i-1th decay tank to the ideal activity. First, discharge it according to the instantaneous receiving amount Δδi of the i-th decay tank within the current ideal temporary storage period, and then adjust the radioactive waste liquid in the decay tank again later, so as to gradually adjust each decay tank to the ideal activity.

[0113] S4376, after the expected waiting time Δti, control the i-th decay tank to receive the i-1-th decay tank to discharge the radioactive waste liquid according to the total received amount δi.

[0114] In this embodiment, the discharge of radioactive waste liquid must not only meet the remaining capacity condition of the i-th decay tank, but also meet the activity range condition of the i-th decay tank. This embodiment can meet these two conditions at the same time by providing specific control steps, and only discharge radioactive waste liquid once in an ideal temporary storage period, thereby reducing the number of times the valve is opened and reducing the risk of pollution caused by possible leakage of radioactive waste liquid during the discharge process.

[0115] In addition, refer to Figure 3 One embodiment of the present invention further provides a discharge control system for medical radioactive waste liquid, the system comprising:

[0116] at least one processor;

[0117] at least one memory for storing at least one program;

[0118] When the at least one program is executed by the at least one processor, the at least one processor implements the above method.

[0119] It can be seen that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0120] In addition, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by a processor or controller, for example, by a processor in the above-mentioned electronic device embodiment, so that the above-mentioned processor can execute the emission control method of medical radioactive waste liquid in the above-mentioned embodiment.

[0121] Similarly, the contents of the above method embodiments are all applicable to the present storage medium embodiments. The functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0122] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0123] The above is a specific description of the preferred implementation of the present disclosure, but the present disclosure is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present disclosure. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present disclosure.

Claims

1. A method for controlling the discharge of medical radioactive waste liquid, characterized in that: The method is applied to N decay tanks that are connected in sequence and have the same capacity, and valves are provided at the ends of the N decay tanks; N is an integer greater than 3; The method comprises the following steps: S100, obtaining actual discharge amounts of radioactive waste liquid in multiple past discharge cycles, averaging multiple actual discharge amounts and adding redundant discharge amounts to obtain an estimated discharge amount; S200, obtaining a preset decay time threshold, calculating the capacity of a single decay tank and the divisor of the expected emission, and determining an ideal temporary storage period according to the decay time threshold, the divisor and the emission period; wherein the sum of N ideal temporary storage periods is greater than the preset decay time threshold; S300, determining the activity ranges of the N decay slots, and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots; wherein the activity ranges of the N decay slots are determined according to a preset critical nuclide activity threshold; S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period; S500, every ideal temporary storage period, controlling the N decay tanks to open corresponding valves in sequence to discharge the radioactive waste liquid.

2. The method for controlling the discharge of medical radioactive waste liquid according to claim 1, characterized in that: In S200, determining the ideal temporary storage period according to the decay time threshold, the divisor and the emission period includes: Determine whether the product of the divisor and the emission period is greater than the decay time threshold. If so, take the product of the divisor and the emission period as the ideal temporary storage period; otherwise, divide the decay time threshold into N equal parts as the ideal temporary storage period.

3. The method for controlling the discharge of medical radioactive waste liquid according to claim 1, characterized in that: In S300, the determining of the activity ranges of the N decay slots and determining the initial temporary storage period of the decay slots according to the activity ranges of the decay slots includes: S310, obtaining a critical nuclide concentration threshold for the radioactive waste liquid to meet the discharge standard, and multiplying the critical nuclide concentration threshold by the volume of a single decay tank to obtain a critical nuclide activity threshold; S320, numbering the N decay tanks according to the discharge order of the radioactive waste liquid, and setting the activity range of the i-th decay tank to [exp(Ni)·Rth, exp(N-i+1)·Rth); wherein i=1, 2, 3, ..., N; and Rth is the activity threshold of the key nuclide; S330, predicting an initial temporary storage period of the decay tank according to the activity range of the decay tank.

4. The method for controlling the discharge of medical radioactive waste liquid according to claim 1, characterized in that: In S400, for the N decay tanks, adjusting the radioactive waste liquid in the decay tanks within the activity range of the decay tanks to adjust the initial temporary storage period of the decay tanks to an ideal temporary storage period includes: S410, for N decay slots, obtaining an ideal temporary storage period and a minimum activity range of the decay slots; S420, determining an ideal activity of the decay tank according to an ideal temporary storage period of the decay tank and a minimum value of an activity range, so that within the ideal temporary storage period of the decay tank, the radioactive activity of the decay tank is reduced to the minimum value of the activity range of the decay tank; S430, obtaining the current radioactivity of the decay tank, and adjusting the radioactive waste liquid in the decay tank according to the current radioactivity of the decay tank and the ideal activity.

5. The method for controlling the discharge of medical radioactive waste liquid according to claim 4, characterized in that: In S430, adjusting the radioactive waste liquid in the decay tank according to the waste liquid adjustment volume of the decay tank includes: S431, within the current ideal temporary storage period, obtaining the current radioactive activities of N decay tanks, determining the activity difference of the decay tanks according to the current radioactive activities of the decay tanks and the ideal activities, and determining the waste liquid adjustment volume of the decay tanks according to the activity difference of the decay tanks and the volume of the radioactive waste liquid in the decay tanks, wherein the waste liquid adjustment volume is the volume of the radioactive waste liquid in the decay tanks that needs to be adjusted; S432, for the i-th decay slot, calculate the time difference between the initial temporary storage period and the ideal temporary storage period of the decay slot, and determine whether the time difference is a positive number. If so, record the decay slot as a discharge slot; if not, record the decay slot as a holding slot; S433, traverse the N decay slots in descending order of the decay slot numbers, and for the i-th decay slot, determine whether the decay slot is the first decay slot, if so, execute S436; if not, execute S434; S434, determine whether the i-th decay slot is a holding slot, if so, execute S435; if not, update i=i-1 and execute S433; S435, determine whether the i-1th decay slot is a holding slot, if so, update i=i-1 and execute S433; if not, execute S436; S436, obtaining the remaining capacity Vi of the i-th holding tank and the waste liquid adjustment volume ΔV(i-1) of the i-1-th decay tank, and taking min(Vi,ΔV(i-1)) as the total receiving volume δi of the i-th decay tank; wherein min() indicates taking a smaller value; S437, controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total receiving amount δi; S438, determining the current remaining temporary storage time of the N decay slots. If it is determined that the time deviations of the current remaining temporary storage time of the N decay slots and the ideal temporary storage period are both within the time deviation threshold range, then the process ends; otherwise, after the current ideal temporary storage period ends, the process proceeds to S431.

6. The method for controlling the discharge of medical radioactive waste liquid according to claim 5, characterized in that: In S437, the step of controlling the i-th decay tank to receive the radioactive waste liquid discharged from the i-1-th decay tank according to the total received amount δi includes: S4371, obtaining the radioactivity R(i-1) of the i-1th decay tank, the volume of radioactive waste liquid V(i-1) of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank, and determining the instantaneous received dose Δδi of the i-th decay tank according to the radioactivity R(i-1) of the i-1th decay tank, the volume V(i-1) of radioactive waste liquid of the i-1th decay tank, the maximum value R(i)max of the activity range of the i-th decay tank, and the radioactivity R(i) of the i-th decay tank; S4372, determine the total receiving amount δi and the instantaneous receiving amount Δδi of the i-th decay slot, if δi>Δδi, execute S4373; if δi≤Δδi, execute S4374; S4373, obtaining the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, and the radioactivity R(i) of the ith decay tank, and determining the estimated waiting time Δti for the ith decay tank to receive the radioactive waste liquid according to the radioactivity R(i-1) of the i-1 th decay tank, the volume V(i-1) of the radioactive waste liquid of the i-1 th decay tank, the total receiving amount δi of the ith decay tank, and the radioactivity R(i) of the ith decay tank; S4374, determine the estimated waiting time Δti and the ideal temporary storage period ti, if Δti>ti, execute S4375; otherwise, execute S4376; S4375, controlling the i-th decay tank to receive the i-1-th decay tank and discharge the radioactive waste liquid according to the instantaneous receiving amount Δδi; S4376, after the expected waiting time Δti, control the i-th decay tank to receive the i-1-th decay tank to discharge the radioactive waste liquid according to the total received amount δi.

7. A discharge control system for medical radioactive waste liquid, characterized in that: The system comprises: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the discharge control method for medical radioactive waste liquid as described in any one of claims 1 to 6.

8. A computer-readable storage medium storing computer-executable instructions, characterized in that: The computer executable instructions are used to execute the discharge control method for medical radioactive waste liquid as described in any one of claims 1 to 6.

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