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Calculation method of surface gamma radiation dose rate during rainfall based on radioactive element sedimentation model

A technology of radioactive elements and calculation methods, which is applied to the calculation field of surface gamma radiation dose rate during rainfall, and can solve problems such as the inability to calculate the surface gamma radiation dose rate

Active Publication Date: 2018-12-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0010] In order to overcome the deficiency that the prior art cannot calculate the surface gamma radiation dose rate during rainfall, the present invention provides a method for calculating the surface gamma radiation dose rate during rainfall based on the radioactive element deposition model

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  • Calculation method of surface gamma radiation dose rate during rainfall based on radioactive element sedimentation model
  • Calculation method of surface gamma radiation dose rate during rainfall based on radioactive element sedimentation model
  • Calculation method of surface gamma radiation dose rate during rainfall based on radioactive element sedimentation model

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] refer to figure 1 with 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 c...

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Abstract

A calculation method of the surface gamma radiation dose rate during rainfall based on a radioactive element sedimentation model comprises the following steps: 1) establishing a surface gamma radiation dose rate simulation model during rainfall; 1.2) establishing a radioactive element sedimentation equation; 2) inputting the rainfall data and the initial soil moisture content, obtaining the soil moisture content at each time during rainfall through the one-dimensional unsaturated flow equation of soil moisture, and then substituting the soil moisture content into the background model to obtainthe background radiation value; inputting rainfall data to simulate the activity of radioactive elements subsiding to the ground, and then getting the surface gamma radiation dose rate appreciation from the radioactive activity according to the dose model; adding up the background radiation value and the surface gamma radiation dose rate appreciation to obtain the surface gamma radiation dose rate prediction data. The invention provides a method for calculating the surface gamma radiation dose rate during rainfall based on a radioactive element sedimentation 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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Application Information

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IPC IPC(8): G06F17/11G06F17/15
CPCG06F17/11G06F17/15
Inventor 陆成刚胡容
Owner ZHEJIANG UNIV OF TECH