An online radiation total dose detection method

Abstract

The application provides an online radiation total dose detection method, which comprises the following steps: determining a corresponding detection device according to radiation source information; the detection device comprises an irradiation cavity and a shielding box, and the irradiation cavity attenuates the received radiation to within a target threshold; placing the detection device at a target detection position; turning on a light source and an optical power meter in the shielding box; an optical fiber is arranged in the irradiation cavity, one end of the optical fiber is connected to the optical power meter in the shielding box, and the other end is connected to the light source in the shielding box; the optical power meter detects the optical power value of the optical fiber and sends the optical power value to a computer through a cable; and the computer determines the radiation total dose of the target detection position according to the optical power value. The application utilizes the principle of optical fiber radiation damage, places the detection device at the target detection position, detects the change of the optical power value of the optical fiber in the device in real time, calculates the corresponding radiation total dose, and realizes the online detection of the radiation total dose of the target environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radiation detection technology, and in particular to an online radiation total dose detection method. BACKGROUND

[0002] With the maturity and development of radiation technology, radiation technology has been widely applied in medical diagnosis imaging, nuclear medicine, radiotherapy, nuclear power generation, radiation detection, three waste treatment in industry, and crop breeding, vegetable and fruit preservation, grain storage in agriculture, etc. However, in the actual application process, due to the difference of application scene, the radiation dose required by the corresponding radiation is different, which leads to the radiation dose becoming an important factor that needs to be accurately controlled, otherwise it is easy to appear: the radiation dose is too low, which cannot produce the required radiation effect; the radiation dose is too high, which may damage the material and cause various problems.

[0003] At present, the existing radiation dose detection method adopts devices which are divided into active detection instruments and passive detection instruments. Among them, the passive detection instrument mainly includes a thermoluminescence detector, a track etching detector, etc. This kind of instrument has the advantages of small size, low cost, and no power consumption, but the disadvantage is that it cannot be detected in real time. The active detection instrument mainly includes an ionization chamber, a semiconductor detector, a scintillator detector, etc. This kind of detector has the advantages of multiple detection types, different source items can be distinguished, and online real-time detection, etc., but more or less has the disadvantages of large size, high power consumption, short service life, and inconvenience for distributed measurement.

[0004] Therefore, it is necessary to develop an online radiation total dose detection method to realize the rapid and accurate online detection of the radiation total dose. SUMMARY

[0005] In view of the above problems, the embodiments of the present application provide an online radiation total dose detection method in order to overcome the above problems or at least partially solve the above problems.

[0006] The embodiments of the present application provide an online radiation total dose detection method, which comprises:

[0007] According to the radiation source information, a corresponding detection device is determined; the detection device comprises an irradiation cavity and a shielding box, and the irradiation cavity attenuates the received radiation to within a target threshold value;

[0008] The detection device is placed at a target detection position;

[0009] The light source and the optical power meter in the shielding box are turned on; the irradiation cavity is provided with an optical fiber, one end of the optical fiber is connected to the optical power meter in the shielding box, and the other end is connected to the light source in the shielding box;

[0010] The optical power meter detects the optical power value of the optical fiber, and sends the optical power value to a computer through a cable;

[0011] The computer determines the total radiation dose of the target detection position according to the optical power value.

[0012] Optionally, after determining the corresponding detection device, the method further comprises:

[0013] The optical fiber in the detection device is replaced with a new optical fiber, the irradiation cavity is disc-shaped and is formed by buckling two surfaces, one surface is an attenuation window, and the other surface is a containing cavity, a spiral-shaped groove is arranged in the containing cavity, and the new optical fiber is fixed by being coiled in the spiral-shaped groove.

[0014] Optionally, a groove is arranged at the edge of the containing cavity, and a boss is arranged at the edge of the attenuation window; and the detection device is placed at the target detection position, comprising:

[0015] The detection device is placed at the target detection position, the attenuation window of the detection device is buckled with the containing cavity, the boss is clamped into the groove, and a sealed metal wall is formed.

[0016] Optionally, the corresponding detection device is determined according to the radiation source information, comprising:

[0017] According to the energy type information and the radiation energy value information of the radiation source, the thickness of the attenuation window is selected, and the detection device with the attenuation window having the thickness is determined;

[0018] The detection device is placed at the target detection position, comprising:

[0019] The irradiation cavity is placed at the target detection position, and the attenuation window is arranged to face the direction of the radiation source.

[0020] Optionally, the edge of the irradiation cavity is provided with a stepped structure plug, and the shielding box is provided with a protruding insertion slot; and the detection device is placed at the target detection position, comprising:

[0021] The plug is inserted into the insertion slot, so that the irradiation cavity is tightly connected with the shielding box.

[0022] Optionally, the spiral-shaped groove in the containing cavity is in communication with the plug, and the optical fiber enters the shielding box through the plug and is connected with the optical power meter and the light source respectively.

[0023] Optionally, the corresponding detection device is determined, comprising:

[0024] According to the detection accuracy, the length and the width of the spiral-shaped groove of the detection device are determined.

[0025] Optionally, the two side panels and the top panel of the shielding box are respectively provided with bosses, the detection device is placed at the target position, comprising:

[0026] The panels of the shielding box are buckled tightly, the bosses of the two side panels and the boss of the top panel are used to form a closed space inside the shielding box.

[0027] Optionally, a maze window is arranged on the back of the shielding box, and the cable passes through the maze window to transmit the optical power value detected by the optical power meter to the computer.

[0028] Optionally, after passing through the maze window, the cable transmits the optical power value detected by the optical power meter to the computer through a metal pipe.

[0029] The embodiment of the present application provides an online total radiation dose detection method, which comprises the following steps: determining a corresponding detection device according to radiation source information; the detection device comprises an irradiation cavity and a shielding box, and the irradiation cavity attenuates received radiation to a target threshold value; the detection device is placed at a target detection position; an optical source and an optical power meter in the shielding box are turned on; an optical fiber is arranged in the irradiation cavity, one end of the optical fiber is connected to the optical power meter in the shielding box, and the other end is connected to the optical source in the shielding box; the optical power meter detects the optical power value of the optical fiber and sends the optical power value to a computer through a cable; and the computer determines the total radiation dose of the target detection position according to the optical power value. The present application utilizes the principle of optical fiber radiation damage, places the detection device at the target detection position, detects the change of the optical power value of the optical fiber in the device in real time, calculates the corresponding total radiation dose, and realizes online detection of the total radiation dose of the target environment.

[0030] The specific beneficial effects of the present application are as follows:

[0031] 1) Online monitoring is realized. The embodiment of the present application can measure the total radiation dose received by the optical fiber at the current time by detecting the change of the optical power value of the optical fiber in the irradiation cavity in real time, and further realizes the early warning function of the radiation dose, so that corresponding early warning information is issued when the total radiation dose reaches the early warning threshold.

[0032] 2) Precise detection. The present application utilizes the computer to receive the optical power value of the optical fiber, calculates the power loss of the optical fiber, utilizes the linear relationship between the power loss and the total radiation dose, and can directly obtain the total radiation dose currently received by the optical fiber. In the detection method of the present embodiment, the interference factors are less and the calculation method is simple and fast, and the detection result is more accurate.

[0033] 3) low cost. In the detection device used in the detection method of the embodiment of the present application, only the optical fiber is susceptible to radiation damage, and the rest of the components are less susceptible to damage. In the embodiment of the present application, the detection device can be reused by replacing the optical fiber. Frequent maintenance of the detection device is avoided, the service life of the device is improved, and the detection cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a step flow chart of an online radiation total dose detection method provided by the embodiment of the present application;

[0036] Figure 2 is a structural schematic diagram of a detection device provided by the embodiment of the present application;

[0037] Figure 3 is a physical schematic diagram of an irradiation chamber provided by the embodiment of the present application;

[0038] Figure 4 is a structural schematic diagram of an irradiation chamber provided by the embodiment of the present application;

[0039] Figure 5 is a connection schematic diagram of an irradiation chamber and a shielding box provided by the embodiment of the present application;

[0040] Figure 6 is a structural schematic diagram of a shielding box provided by the embodiment of the present application;

[0041] Figure 7 is an internal structural schematic diagram of an irradiation chamber provided by the embodiment of the present application;

[0042] BRIEF DESCRIPTION OF DRAWINGS: 1-irradiation chamber, 2-shielding box, 3-computer, 4-optical fiber, 5-optical power meter, 6-light source, 7-radiation source. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be accurately conveyed to those skilled in the art.

[0044] The embodiment of the present application provides an online radiation total dose detection method, referring to Figure 1 , Figure 1 A step flow chart of the online radiation total dose detection method provided by the embodiment of the present application is shown in Figure 1 , and the method comprises the following steps:

[0045] In step S101, a corresponding detection device is determined according to radiation source information; the detection device comprises an irradiation cavity and a shielding box, and the irradiation cavity attenuates received radiation to within a target threshold value;

[0046] All objects in nature, as long as the temperature is above absolute zero, will continuously transmit heat in the form of electromagnetic waves and particles, and this transmission of energy is radiation. Generally, radiation can be divided into non-ionizing radiation and ionizing radiation. Non-ionizing radiation includes light, microwaves, ultrasonic waves, radio waves and the like, and the energy of this kind of radiation is not high, and generally does not cause harm to the human body. Ionizing radiation includes alpha rays, beta rays, gamma rays, neutrons and X-rays, and the like, and the energy of this kind of radiation is high, and the penetrating power is strong, which can directly or indirectly ionize or excite matter, and cause damage to object materials and biological cells. The online radiation total dose detection method proposed in the embodiment is mainly a detection method designed for ionizing radiation.

[0047] In step S102, the detection device is placed at a target detection position;

[0048] In a radiation environment, different positions have different distances from a radiation source, and different barrier objects between the positions and the radiation source, so that the radiation dose corresponding to each position is different. In the embodiment, the detection device can be directly placed at a target detection position where radiation total dose detection is required, and if the detection device cannot be directly placed at the target detection position, the detection device can be placed at a position close to the target detection position, so as to eliminate the error caused by the distance as much as possible.

[0049] In step S103, a light source and a light power meter in the shielding box are turned on; an optical fiber is arranged in the irradiation cavity, one end of the optical fiber is connected to the light power meter in the shielding box, and the other end of the optical fiber is connected to the light source in the shielding box;

[0050] It should be noted that the online radiation total dose detection method provided in the embodiment mainly utilizes the principle of optical fiber radiation damage to realize detection of the radiation total dose. The optical fiber radiation damage refers to that the optical fiber is damaged by radiation to generate color centers inside. When the received radiation dose of the optical fiber is less than a certain boundary value, the concentration of the color centers generated in the optical fiber is in a proportional relationship with the radiation dose, which is reflected in the optical fiber performance, that is, the power loss degree of the optical fiber is in a good linear relationship with the received radiation total dose. Based on this principle, the online radiation total dose detection method provided in the embodiment places the optical fiber in an irradiation chamber with attenuation radiation capability, so that the optical fiber absorbs a radiation dose less than the boundary condition, at which time the power loss of the optical fiber is in a linear relationship with the radiation dose. On this basis, the power of the optical fiber is detected in real time to represent the environmental dose.

[0051] According to the principle of optical fiber radiation damage, the optical fiber can only realize the linear relationship between the power loss degree and the radiation dose when the received radiation is below a certain boundary value. Referring to Figure 2 , Figure 2 a structural schematic diagram of a detection device is shown. As shown in Figure 2 , the detection device comprises 1-irradiation chamber, 2-shielding box and 3-computer, wherein the irradiation chamber is made of metal and has a certain thickness, and can attenuate the received radiation when receiving radiation. The high-energy electrons emitted by the radiation source are attenuated in energy after passing through the irradiation chamber, and then penetrate the irradiation chamber to enter the optical fiber arranged inside. The radiation received by the optical fiber is less than the real radiation intensity in the environment. Specifically, a target threshold value can be set in advance, which can represent a specific radiation intensity value. In actual application process, the related information of the radiation source is known in advance, the energy type and radiation intensity of the radiation source are judged, and the irradiation chamber with a corresponding thickness is selected, so that the irradiation chamber can attenuate the received radiation to within the target threshold value. If the light source, optical power meter and power line are directly exposed in the radiation environment, the radiation will seriously affect the stability of the light source, and the output data of the optical power meter will have errors and other problems. In the embodiment, the optical power meter and the light source are arranged in the shielding box, and the shielding box plays a shielding role to protect the components in it from being damaged by radiation.

[0052] In step S104, the optical power meter detects the optical power value of the optical fiber, and sends the optical power value to the computer through a cable.

[0053] In this embodiment, the optical fiber is a single, complete fiber. One end is connected to a light source, which provides a stable light input; the other end is connected to an optical power meter. When the fiber is irradiated, energy deposition occurs inside, forming corresponding color centers, causing a change in power. The optical power meter detects the optical power value at the output end of the fiber in real time. During this process, the optical power meter can send the detected power value to the computer at regular intervals. For example, it can send the current power value to the computer every 1 second, 2 seconds, or 5 seconds; however, this is not limited in this embodiment.

[0054] Step S105: The computer determines the total radiation dose at the target detection location based on the optical power value.

[0055] In this embodiment, as Figure 2 As shown, the optical power meter in the shielded box is connected to a computer via a cable, sending the detected optical power value to the computer. The computer determines the total radiation dose in the environment at the current moment based on the changes in the received optical power value. In this process, a linear function between optical power loss and total radiation dose can be pre-stored in the computer. Using the power loss of the optical fiber as input, the output total radiation dose is calculated. Furthermore, a warning threshold can be pre-set. When the output total radiation dose exceeds this threshold, a warning signal is sent to relevant personnel, thus achieving real-time monitoring and early warning. In one embodiment, a power loss warning module can also be set in the computer to detect whether the power loss of the optical fiber per unit time is within the normal range. If it exceeds the preset normal range, it indicates that the loss of the optical fiber per unit time is too high, the radiation in the environment is too strong, and the detection equipment needs to be replaced with a thicker attenuation window.

[0056] This embodiment proposes an online total radiation dose detection method. By placing a detection device at the target detection location and monitoring the real-time changes in the optical power value of the optical fiber within the device, the total radiation dose received by the fiber at the current moment can be measured. Furthermore, a radiation dose warning function can be implemented, issuing a warning message when the detected total radiation dose reaches a warning threshold. Moreover, this embodiment utilizes a computer to receive the optical power value of the optical fiber, calculates the power loss of the fiber, and uses the linear relationship between power loss and total radiation dose to directly obtain the current total radiation dose received by the fiber. This process involves fewer interference factors and is simple and quick, resulting in more accurate detection results. In addition, the detection method provided in this embodiment causes less damage to the components in the detection device; by replacing the optical fiber, the lifespan of the device can be extended, reducing detection costs.

[0057] In one embodiment, after determining the corresponding detection device, the method further comprises:

[0058] The optical fiber in the detection device is replaced by a new optical fiber, the irradiation cavity is disc-shaped and is formed by buckling two surfaces, one surface is an attenuation window and the other surface is a containing cavity, a spiral groove is arranged in the containing cavity, and the new optical fiber is coiled and fixed in the spiral groove.

[0059] Since the embodiment utilizes the principle of optical fiber radiation damage, the optical fiber in the detection device will be damaged to a certain extent after each use of the detection device, and the optical fiber in the device needs to be replaced by a new optical fiber of the same length and material before the next use. Referring to Figure 3 , Figure 3 a physical schematic diagram of an irradiation cavity is shown, as Figure 3 indicated, the irradiation cavity can be formed by buckling two surfaces, one surface is an attenuation window and the other surface is a containing cavity, a spiral groove is arranged in the containing cavity, and the optical fiber is coiled and fixed in the spiral groove. The embodiment proposes to arrange the groove in the containing cavity and fix the optical fiber in the groove, which can ensure that the optical fiber can be fixed in the irradiation cavity in the same shape and length after replacement. It should be noted that the optical fiber has a bending loss characteristic, specifically, the optical power of the optical fiber will be lost to a certain extent when it is bent, and the power loss degree is different when the bending angle is different. Considering this characteristic of the optical fiber, the embodiment fixes the shape of the optical fiber in the irradiation cavity by arranging the groove in the containing cavity, avoids the change of the length and bending shape of the optical fiber when the optical fiber is replaced, and thus ensures the accuracy of the measured optical power change.

[0060] In addition, the embodiment sets the irradiation cavity to be disc-shaped, and the optical fiber is coiled in the containing cavity in a spiral shape. It should be noted that the winding method and bending degree of the optical fiber in the irradiation cavity play a key role in detection accuracy and detection range. On the one hand, the optical fiber is arranged in a spiral shape, which controls the bending degree to a certain extent and avoids excessive bending of the optical fiber and excessive power loss. On the other hand, the irradiation cavity is disc-shaped, and the optical fiber is coiled in the cavity in a spiral shape, which can improve the space ratio in the irradiation cavity. By increasing the space ratio of the optical fiber in the irradiation cavity, the volume of the irradiation cavity can be reduced to a certain extent. As a detection probe, the smaller the volume of the irradiation cavity, the more widely it can be applied.

[0061] In one embodiment, determining the corresponding detection device comprises:

[0062] According to the detection accuracy, the length and width of the spiral groove of the detection device are determined.

[0063] It is to be understood that the length and the bending degree of the optical fiber play a key role in the detection accuracy and the detection range. In the embodiment, the length of the optical fiber can be controlled by limiting the length of the groove, and the bending degree of the optical fiber can be controlled by controlling the shape and the width of the groove. For example, the total length of the spiral groove is 1 m, and the width of the groove is 1.2 mm. The width of the groove is set to 1.2 mm to fix the optical fiber. The total length of the groove is set to 1 m, which means that the total length of the optical fiber in the irradiation cavity is 1 m. Thus, the length of the optical fiber can be controlled by limiting the length of the groove. In addition, the length of the optical fiber is set to 1 m, which facilitates the subsequent calculation of the power change of the optical fiber and the total dose of radiation.

[0064] In an embodiment, referring to Figure 4 , Figure 4 a structure diagram of an irradiation cavity is shown. As shown in the figure, a groove is arranged on the edge of the accommodating cavity, and a boss is arranged on the edge of the attenuation window. The detection device is placed at the target detection position, which comprises: Figure 4

[0065] The detection device is placed at the target detection position, and the attenuation window of the detection device is buckled with the accommodating cavity. The boss is clamped into the groove to form a sealed metal wall.

[0066] It is to be understood that when the accommodating cavity and the attenuation window are buckled for use, a gap is easily generated due to the matching accuracy between the components. In a radiation environment, rays and particles can directly enter the irradiation cavity through the gap, thereby causing radiation damage to the optical fiber. This will cause additional loss of optical fiber power and generate a large system error. In the embodiment, in order to solve the above problem, a groove is arranged on the edge of the accommodating cavity, and a boss is arranged on the corresponding position of the edge of the attenuation window. Thus, in the embodiment, after the detection device is placed at the target detection position, the attenuation window and the accommodating cavity are buckled. The boss can be clamped into the groove. The boss and the groove cooperate with each other to form a sealed metal wall around the optical fiber, so that radiation can only enter the optical fiber through the attenuation window, thereby avoiding the problem of radiation leakage caused by the gap.

[0067] In an embodiment, according to the radiation source information, the corresponding detection device is determined, which comprises:

[0068] According to the energy type information and the radiation energy value information of the radiation source, the thickness of the attenuation window is selected, and the detection device with the thickness of the attenuation window is determined.

[0069] The detection device is placed at the target detection position, which comprises:

[0070] The irradiation cavity is placed at the target detection position, and the attenuation window is arranged to face the direction of the radiation source.​

[0071] In the embodiment, the radiation passes through the attenuation window into the optical fiber, and since the attenuation window is a metal wall with a certain thickness, the radiation energy is attenuated to a certain extent. Therefore, the related information of the radiation source needs to be obtained in advance, and the energy type information and the radiation energy value information in the related information are analyzed to determine the thickness of the attenuation window and select the detection device with the thickness of the attenuation window, so that the detection device can reduce the radiation to within the target threshold. Specifically, when the radiation energy of the radiation source is high, a thicker attenuation window is selected, and when the radiation energy of the radiation source is low, a thinner attenuation window is selected. In actual application, a comparison table of radiation energy and attenuation window thickness or a comparison table of radiation energy and detection device model can be obtained in advance, and thus a suitable attenuation window or detection device can be selected according to the comparison table.

[0072] Correspondingly, when the device is placed at the target detection position, specifically, the irradiation cavity in the device is placed at the center of the target detection position, and the attenuation window of the detection device is arranged to face the radiation source, so that the radiation passes through the attenuation window as much as possible. Therefore, in the embodiment, the thickness of the attenuation window is controlled, and the attenuation window is arranged to face the direction of the radiation source, so that the radiation is attenuated to a certain extent when penetrating the attenuation window, and is reduced to a low dose range and then enters the optical fiber in the irradiation cavity.

[0073] In one embodiment, the irradiation cavity is provided with a stepped plug, and the shielding box is provided with a protruding slot. The detection device is placed at the target detection position, comprising:

[0074] The plug is inserted into the slot, so that the irradiation cavity and the shielding box are tightly connected.

[0075] In the embodiment, the irradiation cavity is provided with a plug, and the shielding box is provided with a slot. If the plug and the slot are directly connected, a gap is also easily generated, and in the radiation environment, the rays and particles also enter the shielding box, damaging the devices and cables in the shielding box, such as optical power meters and light sources. In order to prevent the generation of the gap, the plug of the irradiation cavity is arranged in a stepped structure, as shown in Figure 3 When the stepped plug is connected with the protruding slot on the shielding box, only part of the plug enters the slot, and the remaining part is connected with the outside of the slot, so that radiation leakage caused by the fitting gap can be avoided. In actual application, after the detection device is placed at the target detection position, the irradiation cavity and the shielding box need to be connected to avoid the existence of the gap between the two components, which affects the final detection result.

[0076] In one embodiment, the vortex-shaped groove in the receiving cavity communicates with the plug, and the optical fiber enters the shielding box through the plug, connecting to the optical power meter and the light source respectively. In this embodiment, the groove in the receiving cavity is connected to the plug, and the optical fiber fixed in the groove of the receiving cavity can enter the plug through the communicating part, thereby entering the shielding box from the part where the plug connects to the slot, and then connecting to the optical power meter and the light source in the shielding box. (Refer to...) Figure 5 , Figure 5 A schematic diagram of the connection between an irradiation cavity and a shielding box is shown, as follows: Figure 5 As shown, the plug of the irradiation cavity connects to the slot of the shielding box, and the optical fiber can be connected to the optical power meter and light source in the shielding box through the part where the plug and slot connect. In another embodiment, the irradiation cavity and the shielding box can be set up separately, so that the optical fiber is connected from the irradiation cavity to the shielding box through a metal tube. The metal tube is used to isolate radiation and protect the optical fiber.

[0077] In one embodiment, the side panels and top panel of the shielding box are each provided with a boss, which allows the detection device to be placed at the target position, including:

[0078] The panels of the shielding box are fastened tightly, and the protrusions on the side panels and the top panel are used to form a sealed space inside the shielding box.

[0079] Reference Figure 6 , Figure 6 A schematic diagram of a shielding box is shown, such as... Figure 6 As shown, Figure (a) is a view of the front panel of the shielding box, and Figure (b) is a view of the rear panel of the shielding box. The shielding box consists of six panels. If the rectangular panels are directly assembled, gaps can easily form between them. In a radiation environment, radiation particles can easily enter the shielding box through these gaps, damaging the devices and cables inside. In this embodiment, after the detection device is placed at the target detection position, protrusions are provided on the side panels and the top panel to tightly fasten the panels of the shielding box. This allows the protrusions to block the gaps, ensuring a tight panel assembly and preventing radiation leakage.

[0080] In one embodiment, a labyrinthine window is provided on the back of the shielding box, and the cable transmits the optical power value detected by the optical power meter to the computer through the labyrinthine window.

[0081] In this embodiment, as Figure 6Figure (b) shows the rear panel view of the shielding box. A cable connection window is designed on the back of the shielding box. To prevent radiation from entering the shielding box through this channel, this embodiment uses a maze-like window design, preventing the shielding box from direct contact with the external environment. The cable must navigate a winding path before connecting to the outside. This maze-like window is designed because radiation, being rays, cannot be bent and therefore cannot enter the shielding box through the maze-like window. The cable connecting the optical power meter is connected to the computer through this maze-like window, thereby transmitting the fiber optic power value calculated by the optical power meter to the computer.

[0082] In one embodiment, after passing through the labyrinthine window, the cable transmits the optical power value detected by the optical power meter to the computer via a metal conduit. In this embodiment, by setting up a metal conduit connecting the labyrinthine window of the shielded box and the computer, the cable passes through this metal conduit to complete signal transmission, thereby avoiding exposure of the cable to the radiation environment and preventing radiation damage.

[0083] In one embodiment, the optical fiber is disposed in the irradiation cavity in a helical wound manner.

[0084] Reference Figure 7 , Figure 7 A schematic diagram of the internal structure of an irradiation cavity is shown, such as... Figure 7 As shown, the optical fiber can be coiled and fixed in the radiation cavity not only in the vortex shape described in the above embodiments, but also in a spiral winding manner.

[0085] In this embodiment, a cylindrical core is provided in the irradiation cavity, and the optical fiber is spirally wound around the core. Correspondingly, in order to minimize the volume of the irradiation cavity and expand its application range, the irradiation cavity can be set as a cylinder with a diameter larger than that of the core. The cylinder wall is an attenuation layer, which can attenuate the received radiation, so that the radiation received by the induced optical fiber inside is within a low dose range. Specifically, the irradiation cavity mainly consists of a top cover, a cylindrical attenuation layer, a cylindrical core, an optical fiber, a pigtail shielding layer, and a base. The two ends of the optical fiber enter the pigtail shielding layer, which is made of a relatively thick metal material, and plays an isolation role, reducing the impact of radiation on the tail of the optical fiber. The base is provided with two FC / PC fiber couplers for connecting the incoming and outgoing optical fibers, which are respectively connected to the light source and the optical power meter. Specifically, the base can be directly connected to the shielding box, or it can be connected to the shielding box through a metal tube. This embodiment does not impose any restrictions.

[0086] The various embodiments in the specification are described in progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between embodiments can be mutually referred to.

[0087] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, apparatuses, electronic devices and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing terminal equipment to produce a machine, so that the instructions executed by the computer or other programmable data processing terminal equipment produce a device for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one flow or multiple flows and / or blocks Figure 1 an apparatus that implements the functions specified in one block or multiple blocks.

[0088] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to cover all changes and modifications falling within the scope of the embodiments of the present application.

[0089] Finally, it should also be noted that, in this document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or terminal equipment including the element.

[0090] The above describes in detail an online total radiation dose detection method provided by the present application, and the principles and implementation manners of the present application are described by using specific examples; the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application ranges; in summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A method for online total radiation dose detection, characterized in that, include: Based on the radiation source information, determine the corresponding detection device; The detection device includes an irradiation cavity and a shielding box, wherein the irradiation cavity attenuates the received radiation to within the target threshold. Place the detection device at the target detection location; Turn on the light source and optical power meter in the shielding box; the irradiation cavity is equipped with an optical fiber, one end of which is connected to the optical power meter in the shielding box, and the other end is connected to the light source in the shielding box; The optical power meter detects the optical power value of the optical fiber and transmits the optical power value to the computer via a cable; The computer determines the total radiation dose at the target detection location based on the optical power value; After determining the corresponding detection device, the method further includes: The optical fiber in the detection device is replaced with an unused optical fiber. The irradiation cavity is disc-shaped and is formed by two sides fastening together. One side is an attenuation window and the other side is a receiving cavity. The receiving cavity is provided with a vortex-shaped groove. The unused optical fiber is coiled and fixed in the vortex-shaped groove. The receiving cavity has a groove around its edge, and the attenuation window has a protrusion around its edge; placing the detection device at the target detection position includes: The detection device is placed at the target detection position, and the attenuation window of the detection device is fastened to the receiving cavity. The boss is inserted into the groove to form a sealed metal wall.

2. The online total radiation dose detection method according to claim 1, characterized in that, Based on the radiation source information, the corresponding detection device is determined, including: Based on the energy type information and radiation energy value information of the radiation source, the thickness of the attenuation window is selected, and a detection device with an attenuation window of the specified thickness is determined. Placing the detection device at the target detection location includes: The irradiation cavity is placed at the target detection position, and the attenuation window is set to face the radiation source.

3. The online total radiation dose detection method according to claim 1, characterized in that, The irradiation cavity has a stepped plug at its edge, and the shielding box has a protruding slot for placing the detection device at the target detection position, including: Insert the plug into the slot so that the irradiation cavity is tightly connected to the shielding box.

4. The online total radiation dose detection method according to claim 3, characterized in that, The vortex-shaped groove in the receiving cavity is connected to the plug, and the optical fiber enters the shielding box through the plug, connecting to the optical power meter and the light source respectively.

5. The online total radiation dose detection method according to claim 1, characterized in that, The corresponding detection device is determined, including: The length and width of the vortex-shaped groove in the detection device are determined based on the detection accuracy.

6. The online total radiation dose detection method according to claim 1, characterized in that, The shielding box has protrusions on its side panels and top panel, which are used to place the detection device at the target location, including: The panels of the shielding box are fastened tightly, and the protrusions on the side panels and the top panel are used to form a sealed space inside the shielding box.

7. The online total radiation dose detection method according to claim 1, characterized in that, The shielding box has a labyrinthine window on the back, through which the cable transmits the optical power value detected by the optical power meter to the computer.

8. The online total radiation dose detection method according to claim 7, characterized in that, After passing through the labyrinthine window, the cable transmits the optical power value detected by the optical power meter to the computer via a metal conduit.

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