Calculation method of surface gamma radiation dose rate during rainfall based on radioactive element deposition model
A technology of radioactive elements and calculation methods, which is applied in the field of calculation of the surface gamma radiation dose rate during rainfall, and can solve the problem that the surface gamma radiation dose rate cannot be calculated.
Active Publication Date: 2022-04-08
ZHEJIANG UNIV OF TECH
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[0043] The present invention will be further described below in conjunction with the accompanying drawings.
[0044] refer to figure 1 and figure 2 , a method for calculating the surface gamma radiation dose rate during rainfall based on the radioactive element deposition model, including the following steps:
[0045] 1) Establish a simulation model of the surface gamma radiation dose rate during rainfall, the process is as follows:
[0046] 1.1) Establish the one-dimensional unsaturated flow equation of soil moisture:
[0047]
[0048]
[0049] Among them, θ represents soil volume moisture content, t represents time, z represents soil depth, D(θ) and K(θ) represent water diffusivity and hydraulic conductivity of unsaturated soil, respectively;
[0050] Background radiation value function:
[0051]
[0052] Among them, X represents the gamma radiation absorbed dose rate, C Ra 、C Th 、C K represent the soil 226 Ra, 232 Th, 40 K content, a, b, c are fitting co...
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A method for calculating the surface gamma radiation dose rate during rainfall based on a radioactive element deposition model, comprising the following steps: 1) establishing a simulation model of the surface gamma radiation dose rate during rainfall; 1.2) establishing a radioactive element deposition equation; 2) inputting rainfall data As well as the initial moisture content of the soil, the soil moisture content at each moment of the rainfall is obtained through the one-dimensional unsaturated flow equation of soil moisture, and then the moisture content is substituted into the background model to obtain the background radiation value; input rainfall data to simulate radioactive elements The activity that has settled to the ground, and then the increase value of the surface gamma radiation dose rate is obtained from the radioactivity according to the dose-causing model; the background radiation value and the increase value of the surface gamma radiation dose rate are added to obtain the predicted data of the surface gamma radiation dose rate. The invention provides a method for calculating the surface gamma radiation dose rate during rainfall based on a radioactive element deposition model.
Description
technical field [0001] The invention belongs to the field of nuclear radiation safety detection, and in particular relates to a calculation method of the gamma radiation dose rate on the ground surface during rainfall. Background technique [0002] The purpose of radiation environmental monitoring is to check whether the radiation and radioactive levels caused by the operation of nuclear facilities in the surrounding environment comply with relevant national and local regulations, and to check the long-term change trend of environmental radiation caused by man-made nuclear activities (including man-made Changes in environmental radiation levels due to redistribution of natural radionuclides caused by activities) are monitored. The specific purpose and significance of environmental monitoring mainly include the following aspects: [0003] 1. Evaluate the actual or potential exposure level to humans caused by radioactive substances or radiation released into the environment b...
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IPC IPC(8): G06F17/11G06F17/15
CPCG06F17/11G06F17/15
Inventor 陆成刚胡容
Owner ZHEJIANG UNIV OF TECH