CN-122019929-A - Construction method of fish radionuclide discharge dynamic transfer model

CN122019929ACN 122019929 ACN122019929 ACN 122019929ACN-122019929-A

Abstract

The invention discloses a method for constructing a radionuclide discharging dynamic transfer model of fish, which comprises the steps of establishing a water body-fish model to obtain a differential equation for describing the radionuclide discharging dynamic transfer in the water body and the fish body, introducing correction parameters The derivative equation is transformed to obtain a parameter equation of the radionuclide specific activity in the fish body along with the time change, and the initial radionuclide specific activity in the discharging process is set as follows The biological half-period is Obtaining an equation set and simultaneously solving to obtain a model of dynamic transfer of the radionuclide in the fish body in the discharging process, and initiating the specific activity of the radionuclide Specific activity of the non-dischargeable fraction Half-life of living beings is The specific numerical values of the radioactive nuclides are brought in to obtain a dynamic transfer model of the radioactive nuclides in the fish body in the final discharging process. The invention provides a new method for researching the discharge dynamic transfer process of the radionuclide by fishes with small body size and incapability of distinguishing various tissue parts, rapid items and slow items in the body.

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 dynamic transfer model of the radionuclide excretion 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 for describing the dynamic transfer of the radionuclide in the water body and the fish body in the radionuclide discharging process; assuming that part of the radionuclide is not discharged after accumulating in the muscle part of the fish, introducing correction parameters , The specific activity of the nuclide which cannot be discharged from the fish body is represented, and the differential equation is transformed to obtain a parameter equation of the variation of the specific activity of the radionuclide in the fish body along with time; For the parametric equation, let the initial specific activity of the radionuclide in the discharge process be The biological half-period is Obtaining an equation set and carrying out simultaneous solving to obtain a radionuclide dynamic transfer model in the fish body in the discharging process; initial specific Activity of radionuclides Specific activity of the non-dischargeable fraction Half-life of living beings is The specific numerical value of the radioactive nuclide is brought into a dynamic radionuclide transfer model in the fish body in the discharging process, and a corresponding relational expression of the fish on the radionuclide discharging dynamic transfer model is obtained.
2. The method for constructing a dynamic transfer model of radionuclide excretion in fish according to claim 1, wherein the dynamic transfer model of radionuclide in fish during excretion is as follows: (1) Wherein, C 1 (t) is the specific activity of the radionuclide in the fish body at time t, bq/kg.
3. The method for constructing a dynamic transfer model of radionuclide excretion from fish according to claim 2, characterized in that the differential equation is (2) In the formula, K 10 is the migration rate constant of the radionuclide from the fish body to the water body, and 1/d; bq/kg is the specific activity of the nuclide which cannot be discharged from the fish body.
4. The method for constructing a dynamic transfer model of radionuclide excretion from fish according to claim 3, characterized in that 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 excretion from fish according to claim 4, characterized in that the system of equations is 。
6. The method for constructing a dynamic transfer model of radionuclide excretion from fish according to claim 1, wherein the fish body is zebra fish.
7. The method for constructing a dynamic radionuclide concentration transfer model for fish according to claim 6, wherein the zebra fish is wild type AB strain zebra fish.
8. The method for constructing a dynamic transfer model of radionuclide excretion according to claim 1, wherein the radionuclide is 137 Cs.
9. The method for constructing a radionuclide concentration dynamic transfer model by fish according to claim 8, wherein the method comprises the following steps: the concentration of the radionuclide is at least 198 days.
10. The method for constructing a model for dynamic transfer of radionuclide concentration in fish according to claim 8, wherein the radioactive decay constant in the system of equations is as long as the radionuclide has a half-life of 137 Cs And neglected.

Description

Construction method of fish radionuclide discharge dynamic transfer model Technical Field The invention relates to the technical field of nuclear facility environmental impact evaluation, in particular to a method for constructing a radionuclide discharging 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. Meanwhile, after the fishes polluted by the radioactive nuclides enter the clean water area, the radioactive nuclides in the fishes can enter the water body along with the capability of metabolizing the radioactive nuclides, so that the environment of the water body is polluted. Therefore, in order to obtain the metabolic capability of fishes on radionuclides and subsequently evaluate the influence of the discharge of the liquid radionuclides on the water environment, the discharge dynamic transfer rule of the radionuclides needs to be mastered for research. In the prior art, only an estimation method of the concentration coefficient of the nuclide balance state in water by the fish is provided, and no related method for establishing a dynamic model of the radionuclide discharging process by the fish is provided. And for fish with smaller body sizes, which cannot distinguish between tissue sites, fast and slow terms in the body, the method of estimating concentration coefficients is not applicable. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a construction method of a radionuclide discharging dynamic transfer model of fishes, by which the dynamic transfer process of the fishes to radionuclide discharging can be simulated, so that the influence of polluted fishes on the water environment can be further estimated. In order to solve the technical problems, the invention provides the following technical scheme: The method for constructing the dynamic transfer model of the radionuclide excretion 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 for describing the dynamic transfer of the radionuclide in the water body and the fish body in the radionuclide discharging process; assuming that part of the radionuclide is not discharged after accumulating in the muscle part of the fish, introducing correction parameters ,The specific activity of the nuclide which cannot be discharged from the fish body is represented, and the differential equation is transformed to obtain a parameter equation of the variation of the specific activity of the radionuclide in the fish body along with time; For the parametric equation, let the initial specific activity of the radionuclide in the discharge process be The biological half-period isAnd obtaining an equation set and carrying out simultaneous solving to obtain a model for dynamically transferring the radionuclide in the fish body in the discharging process. Initial specific Activity of radionuclidesSpecific activity of the non-dischargeable fractionHalf-life of living beings isThe specific numerical value of the radioactive nuclide is brought into a dynamic radionuclide transfer model in the fish body in the discharging process, and a corresponding relational expression of the fish on the radionuclide discharging dynamic transfer model is obtained. Further, the model of the radionuclide dynamic transfer in the fish body in the discharging process is as follows: (1) Wherein, C 1 (t) is the specific activity of the radionuclide in the fish body at time t, bq/kg. Further, the differential equation is (2) In the formula,K 10 is the migration rate constant of the radionuclide from the fish body to the water body, and 1/d; bq/kg is the specific activity of the nuclide which cannot be discharged from the fish body. Further, the parameter equation is (3) Where K is an arbitrary constant other than 0. Further, the equation set is 。 Further, the fish body is zebra fish. Further, the zebra fish adopts wild type AB strain zebra fish. Further, the radionuclide is 137 Cs. Further, the radionuclide is concentrated for at least 198 days. Further, since the radionuclide has a long half-life of 137 Cs, the radioactive decay constant in the equation setAnd neglected. Compared with the prior art, the method has the beneficial effects that the method constructs a dynamic radionuclide discharge transfer model for fish, focuses on the concentration and discharge