Method for estimating source term of resuspension of super-uranium nuclide under natural conditions

Abstract

The present application relates to a kind of natural conditions under the estimation method of superuranic nuclide resuspension release source term.This application obtains the environmental characteristic parameter of the place of contaminated area, calculates the related parameter of superuranic nuclide pollution condition, calculates the surface covering layer factor of contaminated area soil, calculates the resuspension release source term of superuranic nuclide, can start from the characteristics of soil environment, nuclide characteristics, natural condition three aspects, based on the mass load theory of particulate matter, using the release flux of particulate matter in contaminated area soil and the level of radioactivity concentration in soil, the resuspension release source term of superuranic nuclide is calculated, realizes the resuspension release amount of superuranic nuclide in soil environment pollution under natural conditions is scientifically and accurately evaluated.

Description

Technical Field

[0001] This invention belongs to the field of radiation protection technology, specifically relating to a method for estimating the source term of resuspension release of transuranic nuclides under natural conditions. Background Technology

[0002] Sources of radioactive contamination include inappropriate practices in the management and disposal of radioactive waste, radioactive accidents, major nuclear power plant accidents, nuclear weapons tests, and accidental releases of radionuclides from nuclear facilities or other user sites.

[0003] Since the development of nuclear weapons in the 20th century, the environmental pollution caused by radioactive nuclides resulting from nuclear weapons testing has led to the development of functions that describe the resuspension release factor of transuranic nuclides over time. However, these functions cannot characterize the impact of environmental features such as soil surface and natural environment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a method for estimating the resuspension release source term of transuranic nuclides under natural conditions. This method considers three aspects: soil environmental characteristics, nuclide characteristics, and natural conditions. Based on the particulate matter mass load theory, it calculates the resuspension release source term of transuranic nuclides using the release flux of particulate matter in contaminated soil and the concentration level of radioactivity in the soil. This enables a scientific and accurate assessment of the resuspension release of transuranic nuclides in soil pollution under natural conditions.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: A method for estimating the source term of transuranic nuclide resuspension release under natural conditions, comprising the following steps:

[0006] S1. Obtain environmental characteristic parameters of the location of the polluted area;

[0007] The environmental characteristic parameters include: the annual average wind speed of the polluted area, the thickness of the surface cover soil layer of the polluted soil, the surface roughness of the soil in the polluted area, and the critical wind speed at which dust is generated in the polluted area.

[0008] S2. Calculate the relevant parameters of transuranic nuclide contamination status;

[0009] The parameters related to the contamination status of transuranic nuclides include: the area of ​​the contaminated area, the thickness of the soil contaminated with transuranic nuclides in the contaminated area, and the activity concentration levels of transuranic nuclides and their daughter nuclides i at different times.

[0010] S3. Calculate the soil surface cover factor in the polluted area;

[0011] Based on the thickness of the soil contaminated with transuranic nuclides in the contaminated area, the thickness of the surface cover soil layer of the contaminated soil, and the thickness of the mixed layer of the contaminated soil, the surface cover soil factor of the soil in the contaminated area was calculated under different conditions.

[0012] S4. Calculate the resuspension release source term of transuranic nuclides;

[0013] This includes calculating the resuspension release rate of transuranic nuclides and their daughter nuclides i in the soil of the contaminated area at different times, and obtaining the resuspension release amount of transuranic nuclides and their daughter nuclides i within the required time period.

[0014] Furthermore, step S1 includes the following specific steps:

[0015] S11. Collect the average annual wind speed of the polluted area over the past 20 years;

[0016] S12. Collect information on the surface conditions of the contaminated area, including measuring the thickness of the surface cover soil layer of the contaminated soil and the surface roughness of the soil in the contaminated area.

[0017] Furthermore, the critical wind speed at which dust is generated in the polluted area is the critical wind speed at a height of 10m when dust is generated in the polluted area, calculated using formula (1):

[0018] (1)

[0019] In the formula:

[0020] u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s;

[0021] Z0 represents the surface roughness of the soil in the polluted area, in meters (m).

[0022] u * denoted as the soil surface friction velocity, in m / s.

[0023] Furthermore, the factors influencing wind speed and soil surface roughness on particulate matter emission flux were calculated using formula (2):

[0024] (2)

[0025] In the formula:

[0026] x is an empirical parameter calculated based on the annual average wind speed of the polluted area and the critical wind speed at which dust is generated in the polluted area. Where u is the average annual wind speed at a height of 10m in the polluted area over the past 20 years, in m / s; u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s;

[0027] F(x) represents the factors influencing the particulate matter release flux, which are wind speed and soil surface roughness.

[0028] Furthermore, step S2 includes the following specific steps:

[0029] The contamination extent of transuranic nuclides is determined using a source term investigation report of a radioactive contaminated site, and the area of ​​the contaminated region is calculated based on the contamination extent.

[0030] Furthermore, the average thickness of the soil contaminated with transuranic nuclides in the contaminated area within the given contaminated range is taken to obtain the thickness of the soil contaminated with transuranic nuclides in the contaminated area.

[0031] Furthermore, the activity concentration levels of transuranic nuclides at different times are calculated using formula (3):

[0032] (3)

[0033] In the formula:

[0034] i represents the i-th nuclide formed by the decay of the radioactive transuranic nuclide itself during the decay process of the parent transuranic nuclide. The value of i is a natural number from 1 to n. When i=1, it is the parent transuranic nuclide.

[0035] k represents the kth intermediate daughter nuclide when the parent transuranic nuclide decays into daughter nuclide i, and the value of k is a natural number from 0 to i-1.

[0036] A i (t) represents the activity concentration level of transuranic nuclide and its daughter nuclide i at time t, in Bq / kg;

[0037] a i,k This represents the activity concentration of transuranic nuclides considering their decay daughters, in Bq / kg; where a 1,0 =A1(0), which is the activity concentration level of transuranic nuclide and its daughter nuclide i at time 0, obtained by averaging the analysis results of transuranic nuclide and its daughter nuclide i in the surface soil sample within the contaminated area; , ;

[0038] λ i and λ k Let a represent the decay constants of nuclides i and k, respectively. -1 ;

[0039] λs is the removal rate constant of nuclides in soil, a -1 .

[0040] Furthermore, the calculation method for the soil surface cover factor in the polluted area is as follows:

[0041] When d c When f(t) = 0, f(t) = 1;

[0042] When d c (t)+dp (t)≤d mix When, f(t) = d p (t) / d mix ;

[0043] When d c (t)≤d mix ≤d c (t)+d p When f(t) = 1 - d p (t) / d mix ;

[0044] When d c (t)≥d mix When f(t) = 0.

[0045] in,

[0046] f(t) represents the soil surface cover factor in the polluted area at time t;

[0047] d c (t) represents the thickness of the surface soil layer covering the contaminated soil at time t, in cm;

[0048] d p (t) represents the thickness of the soil contaminated with transuranic nuclides in the contaminated area at time t, in cm;

[0049] d mix Indicates the thickness of the contaminated soil mixture layer, in cm.

[0050] Furthermore, the resuspension release rates of transuranic nuclides and their daughter nuclides i in the soil of the contaminated area at different times were calculated using formula (4):

[0051] (4)

[0052] In the formula:

[0053] J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the surface of contaminated soil at time t, in Bq / s;

[0054] f(t) represents the soil surface cover factor in the polluted area at time t;

[0055] A i (t) represents the activity concentration level of transuranic nuclide and its daughter nuclide i at time t, in Bq / kg;

[0056] S represents the area of ​​the polluted region, in meters. 2 ;

[0057] u represents the average annual wind speed at a height of 10m in the polluted area over the past 20 years, in m / s;

[0058] u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s;

[0059] F(x) represents the factors influencing the particulate matter release flux, which are wind speed and soil surface roughness.

[0060] Furthermore, the resuspension release amount of transuranic nuclides and their daughter nuclides i within the required time period is calculated using formula (5):

[0061] (5)

[0062] In the formula:

[0063] Q i Bq represents the amount of resuspension release of transuranic nuclides and their daughter nuclides i within the required time period 0 to n in a radioactively contaminated site;

[0064] J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the contaminated soil surface at time t, in Bq / s.

[0065] The beneficial effects of this invention are as follows: By using the method for estimating the resuspension release source term of transuranic nuclides under natural conditions provided by this invention, the environmental characteristic parameters of the polluted area are obtained, relevant parameters of transuranic nuclide pollution status are calculated, the soil surface cover factor of the polluted area is calculated, and the resuspension release source term of transuranic nuclides is calculated. Based on the particulate matter mass load theory, the release flux of particulate matter in the soil of the polluted area and the concentration level of radioactivity in the soil are used to calculate the resuspension release source term of transuranic nuclides, thereby achieving a scientific and accurate assessment of the resuspension release of transuranic nuclides in soil pollution under natural conditions. Attached Figure Description

[0066] Figure 1 A schematic flowchart of a method for estimating the source term of transuranic nuclide resuspension release under natural conditions, provided for an embodiment of the present invention. Detailed Implementation

[0067] The technical solutions in the embodiments of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0068] To scientifically and accurately assess the resuspension release source term of transuranic nuclides in soil pollution under natural conditions, the embodiments of this invention fully consider the influencing factors of particulate matter resuspension in soil: soil environmental characteristics (soil surface roughness, presence or absence of soil cover, area of ​​contaminated area, depth of contaminated soil, etc.), nuclide characteristics (decay characteristics, presence of decay products), and natural conditions (wind speed). Based on the particulate matter mass load theory, the resuspension release of transuranic nuclides is calculated by using the release flux of particulate matter in the contaminated soil and the radioactivity concentration level in the soil. A method for estimating the resuspension release source term of transuranic nuclides on the soil surface under natural conditions is established to more scientifically and reasonably assess the radiation environmental risk of radioactive contaminated sites.

[0069] like Figure 1 As shown, this embodiment provides a method for estimating the resuspension release source term of transuranic nuclides under natural conditions, used to scientifically and accurately assess the resuspension release of transuranic nuclides in soil pollution under natural conditions. The method starts from the particle size of inhalable particulate matter (≤10 μm), considering that wind is the main factor affecting the resuspension of particulate matter on the soil surface under natural conditions, and refers to the surface PM caused by wind erosion given by Cowherd et al. (1985). 10 A method for calculating the release flux of radionuclides is presented, taking into account the decay characteristics of radionuclides, the thickness of the surface cover soil layer, and the influence of the mixed layer. A method for estimating the source term of radionuclides released from the soil surface under natural conditions is also provided. The method includes the following steps:

[0070] S1. Obtain environmental characteristic parameters of the location of the polluted area;

[0071] The environmental characteristic parameters include: the annual average wind speed of the polluted area, the thickness of the surface cover soil layer of the polluted soil, the surface roughness of the soil in the polluted area, the critical wind speed at a height of 10m when dust is generated in the polluted area, and the factors affecting the particulate matter release flux by wind speed and soil surface roughness.

[0072] In this embodiment, step S1 includes the following specific steps:

[0073] S11. Collect the average annual wind speed u of the polluted area over the past 20 years;

[0074] S12. Collect information on the surface conditions of the contaminated area, including measuring the thickness d of the surface cover soil layer of the contaminated soil. c (t) and the soil surface roughness Z0 in the polluted area;

[0075] S13. Calculate the critical wind speed u at a height of 10m when dust is generated in the polluted area using formula (1). t ;

[0076] (1)

[0077] In the formula:

[0078] Z0 represents the surface roughness of the soil in the polluted area, in meters, and should be given according to the surface properties of different polluted areas.

[0079] u * The friction velocity of the soil surface is expressed in m / s, and is typically taken as 0.625 m / s.

[0080] S14. The factors affecting wind speed and soil surface roughness on particulate matter release flux are calculated using formula (2).

[0081] (2)

[0082] In the formula:

[0083] x is based on the annual average wind speed u and the critical wind speed u. t The calculated empirical parameters, ;

[0084] F(x) represents the influence factors of wind speed and soil surface roughness on particulate matter emission flux, referring to the empirical function of x given by Cowherd et al (1985).

[0085] S2. Calculate the relevant parameters of transuranic nuclide contamination status;

[0086] The parameters related to the transuranic nuclide contamination status include: the area of ​​the contaminated region, the thickness of the soil contaminated with transuranic nuclides in the contaminated region, and the activity concentration levels of transuranic nuclides and their daughter nuclides i at different times.

[0087] In this embodiment, step S2 includes the following specific steps:

[0088] S21. The contamination range of transuranic nuclides is determined using the source term investigation report of the radioactive contamination site, and the area S of the contaminated area is calculated based on the contamination range.

[0089] The average thickness of the soil contaminated with transuranic nuclides in the contaminated area within the given contaminated range is used to obtain the thickness of the soil contaminated with transuranic nuclides in the contaminated area.

[0090] S22. Take the average value of the analysis results of transuranic nuclides in the surface soil samples within the pollution range to obtain the activity concentration level A1(0) of transuranic nuclides at time 0; then use the following formula (3) to calculate the activity concentration levels of transuranic nuclides and their daughter nuclides i at different times.

[0091] (3)

[0092] In the formula:

[0093] i represents the i-th nuclide formed by the decay of the radioactive transuranic nuclide itself during the decay process of the parent transuranic nuclide. The value of i is a natural number from 1 to n. When i=1, it is the parent transuranic nuclide.

[0094] k represents the kth intermediate daughter nuclide when the parent transuranic nuclide decays into daughter nuclide i, and the value of k is a natural number from 0 to i-1.

[0095] A i (t) represents the activity concentration level of transuranic nuclide and its daughter nuclide i at time t, in Bq / kg;

[0096] a i,k This represents the activity concentration of transuranic nuclides considering their decay daughters, in Bq / kg; where a 1,0 =A1(0), which is the activity concentration level of transuranic nuclide and its daughter nuclide i at time 0, obtained by averaging the analysis results of transuranic nuclide and its daughter nuclide i in the surface soil sample within the contaminated area; , ;

[0097] λ i and λ k Let a represent the decay constants of nuclides i and k, respectively. -1 ;

[0098] λs is the removal rate constant of nuclides in soil, typically taken as 1×10⁻⁶. -2 a -1 .

[0099] S3. Calculate the soil surface cover factor f(t) in the polluted area;

[0100] Based on the thickness d of the soil contaminated with transuranic nuclides in the contaminated area p (t), thickness of the surface cover soil layer of contaminated soil d c (t) and thickness d of the contaminated soil mixed layer mix The soil surface cover factor f(t) in the polluted area was calculated under different conditions. The calculation method is as follows:

[0101] When d c When f(t) = 0, f(t) = 1;

[0102] When d c (t)+d p (t)≤d mix When, f(t) = d p (t) / d mix ;

[0103] When d c (t)≤dmix ≤d c (t)+d p When f(t) = 1 - d p (t) / d mix ;

[0104] When d c (t)≥d mix When f(t) = 0.

[0105] in,

[0106] f(t) represents the soil surface cover factor of the contaminated area at time t; this invention refers to the calculation method of particulate matter resuspension factor under different contaminated soil cover and contaminated soil depth given by C. Yu et al. to give the contaminated soil surface cover factor;

[0107] d c (t) represents the thickness of the surface soil layer covering the contaminated soil at time t, in cm;

[0108] d p (t) represents the thickness of the soil contaminated with transuranic nuclides in the contaminated area at time t, in cm, and takes the average thickness of the soil contaminated with transuranic nuclides in the contaminated area;

[0109] d mix This indicates the thickness of the contaminated soil mixture layer, typically 15cm.

[0110] S4. Calculate the resuspension release source term of transuranic nuclides;

[0111] The calculation of the transuranic nuclide resuspension release source term includes: calculating the resuspension release rate of transuranic nuclide and its daughter nuclide i in the soil of the contaminated area at different times, and obtaining the resuspension release amount of transuranic nuclide and its daughter nuclide i within the required time period.

[0112] In this embodiment, step S4 includes the following steps:

[0113] S41. Based on the calculation results of steps S1, S2 and S3, the resuspension release rate of transuranic nuclides and their daughter nuclides i in the soil of the contaminated area at different times is calculated using formula (4).

[0114] (4)

[0115] In the formula:

[0116] J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the surface of contaminated soil at time t, in Bq / s;

[0117] f(t) represents the soil surface cover factor in the polluted area at time t;

[0118] A i (t) represents the activity concentration level of the transuranic nuclide and its daughter nuclide i at time t, in Bq / kg; considering the changes of transuranic nuclide in the soil of the contaminated area over time, the main considerations are the removal of radioactive transuranic nuclide from the soil surface, precipitation washing, and migration to groundwater (λs), while also considering the decay of the radioactive transuranic nuclide itself (λs). i and λ k );

[0119] S represents the area of ​​the polluted region, in meters. 2 The area of ​​the contaminated zone is determined according to the contamination range of transuranic nuclides as determined in the actual radioactive contamination site source term investigation report;

[0120] u represents the average annual wind speed at a height of 10m in the polluted area over the past 20 years, in m / s;

[0121] u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s;

[0122] F(x) represents the factors influencing the particulate matter release flux, which are wind speed and soil surface roughness.

[0123] S42. Integrate the release rates of transuranic nuclides in the soil of the contaminated area at different resuspension times to obtain the resuspension release amount Q of transuranic nuclides and their daughter nuclides i within the required time period. i The resuspension release amount Q of transuranic nuclides and their daughter nuclides i within the required time period is calculated using the following formula (5). i :

[0124] (5)

[0125] In the formula:

[0126] Q i Bq represents the amount of resuspension release of transuranic nuclides and their daughter nuclides i within the required time period 0 to n in a radioactively contaminated site;

[0127] J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the contaminated soil surface at time t, in Bq / s.

[0128] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention is also intended to include these modifications and variations.

Claims

1. A method for estimating the source term of transuranic nuclide resuspension release under natural conditions, characterized in that, Includes the following steps: S1. Obtain environmental characteristic parameters of the location of the polluted area; The environmental characteristic parameters include: the annual average wind speed of the polluted area, the thickness of the surface cover soil layer of the polluted soil, the surface roughness of the soil in the polluted area, and the critical wind speed at which dust is generated in the polluted area. S2. Calculate the relevant parameters of transuranic nuclide contamination status; The parameters related to the contamination status of transuranic nuclides include: the area of ​​the contaminated area, the thickness of the soil contaminated with transuranic nuclides in the contaminated area, and the activity concentration levels of transuranic nuclides and their daughter nuclides i at different times. S3. Calculate the soil surface cover factor in the polluted area; Based on the thickness of the soil contaminated with transuranic nuclides in the contaminated area, the thickness of the surface cover soil layer of the contaminated soil, and the thickness of the mixed layer of the contaminated soil, the surface cover soil factor of the soil in the contaminated area was calculated under different conditions. S4. Calculate the resuspension release source term of transuranic nuclides; Based on the calculation results of steps S1, S2, and S3, the resuspension release rate of transuranic nuclides and their daughter nuclides i in the soil of the contaminated area at different times is calculated, and the resuspension release amount of transuranic nuclides and their daughter nuclides i within the required time period is obtained.

2. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 1, characterized in that, Step S1 includes the following specific steps: S11. Collect the average annual wind speed of the polluted area over the past 20 years; S12. Collect information on the surface conditions of the contaminated area, including measuring the thickness of the surface cover soil layer of the contaminated soil and the surface roughness of the soil in the contaminated area.

3. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 2, characterized in that, The critical wind speed at which dust is generated in the polluted area is the critical wind speed at a height of 10m when dust is generated in the polluted area, and is calculated using formula (1): （1） In the formula: u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s; Z0 represents the surface roughness of the soil in the polluted area, in meters (m). u * denoted as the soil surface friction velocity, in m / s.

4. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 3, characterized in that, The factors influencing wind speed and soil surface roughness on particulate matter emission flux were calculated using formula (2): （2） In the formula: x is an empirical parameter calculated based on the annual average wind speed of the polluted area and the critical wind speed at which dust is generated in the polluted area. Where u is the average annual wind speed at a height of 10m in the polluted area over the past 20 years, in m / s; u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s; F(x) represents the factors influencing the particulate matter release flux, which are wind speed and soil surface roughness.

5. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 4, characterized in that, Step S2 includes the following specific steps: The contamination extent of transuranic nuclides is determined using a source term investigation report of a radioactive contaminated site, and the area of ​​the contaminated region is calculated based on the contamination extent.

6. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 5, characterized in that, The average thickness of the soil contaminated with transuranic nuclides in the contaminated area within the given contaminated range is used to obtain the thickness of the soil contaminated with transuranic nuclides in the contaminated area.

7. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 6, characterized in that, The activity concentration levels of transuranic nuclides and their daughter nuclides i at different times were calculated using formula (3): （3） In the formula: i represents the i-th nuclide formed by the decay of the radioactive transuranic nuclide itself during the decay process of the parent transuranic nuclide. The value of i is a natural number from 1 to n. When i=1, it is the parent transuranic nuclide. k represents the kth intermediate daughter nuclide when the parent transuranic nuclide decays into daughter nuclide i, and the value of k is a natural number from 0 to i-1. A i (t) represents the activity concentration level of transuranic nuclide and its daughter nuclide i at time t, in Bq / kg; a i,k This represents the activity concentration of transuranic nuclides considering their decay daughters, in Bq / kg; where a 1,0 =A1(0), which is the activity concentration level of transuranic nuclide and its daughter nuclide i at time 0, obtained by averaging the analysis results of transuranic nuclide and its daughter nuclide i in the surface soil sample within the contaminated area; ; λ i and λ k Let a represent the decay constants of nuclides i and k, respectively. -1 ; λs is the removal rate constant of nuclides in soil, a -1 .

8. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 7, characterized in that, The calculation method for the soil surface cover factor in the polluted area is as follows: When d c When f(t) = 0, f(t) = 1; When d c (t)+d p (t)≤d mix When, f(t) = d p (t) / d mix ; When d c (t)≤d mix ≤d c (t)+d p When f(t) = 1 - d p (t) / d mix ; When d c (t)≥d mix When f(t) = 0; in, f(t) represents the soil surface cover factor in the polluted area at time t; d c (t) represents the thickness of the surface soil layer covering the contaminated soil at time t, in cm; d p (t) represents the thickness of the soil contaminated with transuranic nuclides in the contaminated area at time t, in cm; d mix Indicates the thickness of the contaminated soil mixture layer, in cm.

9. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 8, characterized in that, The resuspension release rates of transuranic nuclides and their daughter nuclides i in the soil of the contaminated area at different times were calculated using formula (4): （4） In the formula: J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the surface of contaminated soil at time t, in Bq / s; f(t) represents the soil surface cover factor in the polluted area at time t; A i (t) represents the activity concentration level of transuranic nuclide and its daughter nuclide i at time t, in Bq / kg; S represents the area of ​​the polluted region, in meters. 2 ; u represents the average annual wind speed at a height of 10m in the polluted area over the past 20 years, in m / s; u t The critical wind speed at a height of 10m when dust is generated in the polluted area, in m / s; F(x) represents the factors influencing the particulate matter release flux, which are wind speed and soil surface roughness.

10. The method for estimating the source term of transuranic nuclide resuspension release under natural conditions according to claim 9, characterized in that, The resuspension release of transuranic nuclides and their daughter nuclides i within the required time period is calculated using formula (5): （5） In the formula: Q i Bq represents the amount of resuspension release of transuranic nuclides and their daughter nuclides i within the required time period 0 to n in a radioactively contaminated site; J i (t) represents the release rate of radioactive transuranic nuclides and their daughter nuclides i from the contaminated soil surface at time t, in Bq / s.

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