CN-122019928-A - Construction method of radionuclide concentration dynamic transfer model for fishes

CN122019928ACN 122019928 ACN122019928 ACN 122019928ACN-122019928-A

Abstract

The invention discloses a method for constructing a radionuclide concentration dynamic transfer model of fish, which comprises the following steps of establishing a water body-fish two-reservoir chamber model to obtain a differential equation for describing the radionuclide dynamic transfer in the water body and the fish body in the concentration process, transforming the differential equation to obtain a parameter equation of the radionuclide specific activity in the fish reservoir chamber changing with time, and setting the concentration coefficient of the radionuclide in the balance state as the concentration coefficient of the radionuclide in the fish reservoir chamber according to the obtained parameter equation Half-life of uptake , the density of the water body is Combining initial conditions with initial specific activity of 0 to obtain equation set and simultaneous solution to obtain dynamic radionuclide transfer model in fish body during concentration process, which comprises the steps of mixing water density Specific activity of radionuclides in water Concentration coefficient of fish nuclide And half-life of intake The specific numerical values of the radioactive nuclides are brought into the process to obtain a dynamic transfer model of the radioactive nuclides in the fish body in the final concentration process. The method can simulate the dynamic transfer behavior of the fishes to the radionuclides in the water, explore the dynamic transfer rule of the fishes to the radionuclides, and further evaluate the influence of nuclear power liquid effluent discharge on the water environment.

Inventors

Feng Qingjing
CAO SHAOFEI
HAN YAOWEN
DU FANGNI
LIAN BING
ZHANG JUNFANG
ZHANG CHENG
ZHANG CHAO

Assignees

中国辐射防护研究院

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (10)

1. The method for constructing the radionuclide concentration dynamic transfer model by the fish is characterized by comprising the following steps of: Establishing a water body-fish two-reservoir chamber model to obtain a differential equation describing the dynamic transfer of the radionuclide in the water body and the fish body in the concentration process; The radionuclide specific activity in the water body warehouse is not changed along with time, and the above differential equation is transformed to obtain a parameter equation of the radionuclide specific activity in the fish body warehouse along with time; Aiming at the parameter equation, the concentration coefficient of the fish nuclide in the equilibrium state is set as Half-life of uptake , the density of the water body is Combining initial conditions with initial specific activity of 0 to obtain an equation set and performing simultaneous solution to obtain a dynamic radionuclide transfer model in the fish body in the concentration process; Density of water body Specific activity of radionuclides in water Concentration coefficient of fish nuclide And half-life of intake The specific numerical value of the radionuclide is brought into a dynamic radionuclide transfer model in the fish body, and a corresponding relation of the radionuclide concentration dynamic transfer model of the fish is obtained.
2. The method for constructing a dynamic radionuclide concentration transfer model for fish according to claim 1, wherein the dynamic radionuclide transfer model in the concentration process is as follows: (1) wherein C 1 (t) is the specific activity of the radionuclide in the fish pond room at time t, bq/kg, Is the specific activity of the radionuclide in the water body reservoir chamber, bq/kg.
3. The method for constructing a model of dynamic transfer of radionuclide concentration by fish according to claim 2, wherein the differential equation of the dynamic transfer is (2) In the formula, Is the radioactive decay constant, 1/d, C 0 (t) and C 1 (t) are the specific activities of the radionuclides in the water body and the fish pooling chamber at time t, bq/kg, and k 01 and k 10 are the migration rate constants of the radionuclides from the water body to the fish pooling chamber and from the fish pooling chamber to the water body pooling chamber, respectively, 1/d.
4. The method for constructing a model of radionuclide concentration dynamic transfer according to claim 3, wherein the parametric equation is (3) Where K is an arbitrary constant other than 0.
5. The method for constructing a model for dynamic transfer of radionuclide concentration in fish according to claim 4, wherein the specific activity of radionuclide in the water reservoir does not change with time, Is constant 。
6. The method for constructing a model for dynamic transfer of radionuclide concentration in fish according to claim 5, characterized in that the system of equations is 。
7. The method for constructing a model for the dynamic transfer of radionuclide concentration by fish according to claim 1, wherein the fish body is zebra fish.
8. The method for constructing a dynamic radionuclide concentration transfer model for fish according to claim 1, wherein the radionuclide is 137 Cs.
9. The method of claim 8, wherein the concentration of the radionuclide is performed for at least 58 days.
10. The method for constructing a model for dynamic transfer of radionuclide concentration in fish according to claim 1, wherein the average value of radionuclide specific activities in fish for several days is selected as the concentration of radionuclide in fish in an equilibrium state.

Description

Construction method of radionuclide concentration dynamic transfer model for fishes Technical Field The invention relates to the technical field of nuclear facility environmental impact evaluation, in particular to a method for constructing a radionuclide concentration dynamic transfer model by fishes. Background The nuclear energy has the characteristics of economy and high efficiency, is an ideal clean energy source, promotes the economic rapid development, but the nuclear power creates economic value and simultaneously discharges some liquid effluent containing radioactive nuclides into nearby water areas, and can have certain influence on water environment and living beings. Research shows that fish can concentrate radionuclides through direct contact with water or ingestion ways as a key link of an aquatic food chain, and can form a potential threat to human health through biological amplification. In the prior art, in order to study the concentration dynamic transfer rule of the radionuclide in the aquatic ecosystem and evaluate the influence of the discharge of the liquid state effluent of the radionuclide on fishes in the water environment, a patent with the publication number CN113609654A discloses a method and a system for estimating the concentration coefficient of the radionuclide balance state in the water by the fishes, based on the living characteristics of the fishes and the accumulation characteristics of the radionuclide in organisms, each tissue part of the fishes is divided into a fast item and a slow item according to the different accumulation speeds of the radionuclide transfer, and a dynamic transfer model of the radionuclide between the inside of the fishes and the water environment is established. However, the method is only suitable for researching the concentration dynamic transfer process of the radionuclide by fishes with large body sizes and capable of clearly distinguishing the tissue parts, the fast items and the slow items in the body, and is not suitable for small fishes with small body sizes and incapable of distinguishing the tissue parts, the fast items and the slow items in the body. The model building method is based on the premise that transfer parameters of various tissue parts of fish to nuclides are acquired, however, the research on the transfer parameters is relatively less at home and abroad, the data is very deficient, and the method has poor practicability. There is therefore a lack of further exploration and investigation in this field of the laws of the process of concentrated dynamic transfer of radionuclides. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a construction method of a radionuclide concentration dynamic transfer model for fishes, by which the dynamic transfer behavior of the fishes on the radionuclides in water can be simulated, and the dynamic transfer rule of the fishes on the radionuclides is explored, so that the influence of nuclear power liquid effluent discharge on the water environment is further evaluated. In order to solve the technical problems, the invention provides the following technical scheme: The method for constructing the radionuclide concentration dynamic transfer model by the fish is characterized by comprising the following steps of: Establishing a water body-fish two-reservoir chamber model to obtain a differential equation describing the dynamic transfer of the radionuclide in the water body and the fish body in the concentration process; The radionuclide specific activity in the water body warehouse is not changed along with time, and the above differential equation is transformed to obtain a parameter equation of the radionuclide specific activity in the fish body warehouse along with time; Aiming at the parameter equation, the concentration coefficient of the fish nuclide in the equilibrium state is set as Half-life of uptake, the density of the water body isCombining initial conditions with initial specific activity of 0 to obtain an equation set and performing simultaneous solution to obtain a dynamic radionuclide transfer model in the fish body in the concentration process; Density of water body Specific activity of radionuclides in waterConcentration coefficient of fish nuclideAnd half-life of intakeThe specific numerical value of the radionuclide is brought into a dynamic radionuclide transfer model in the fish body, and a corresponding relation of the radionuclide concentration dynamic transfer model of the fish is obtained. Further, the dynamic transfer model of the radionuclide in the concentration process in the fish body is as follows: (1) wherein C 1 (t) is the specific activity of the radionuclide in the fish pond room at time t, bq/kg, Is the specific activity of the radionuclide in the water body reservoir chamber, bq/kg. Further, the differential equation of the dynamic transition is that (2) In the formula,Is the radioactive decay constant, 1/d, C 0 (t) and C