Method and device for measuring potential radon concentration of soil by using surface soil dynamics

Abstract

A method and a device for measuring the potential radon concentration of soil by using surface soil dynamics are provided. The method comprises the steps of establishing a differential equation of migration and distribution of radon in soil, sampling surface soil, then establishing a change rule equation by using the change rule of the radon concentration in a closed-loop gas path measuring device, changing the volume of the measuring device to obtain the changes of the radon concentration in the measuring device under different measuring volumes, calculating the generation rate A of radon andthe porosity eta of soil, and calculating the potential radon concentration of soil by using the calculated generation rate A of radon and porosity eta of soil. The values of n measurement periods inthe measuring device are used for nonlinear fitting, without waiting for the radon concentration in the device to be stable, thereby saving the measurement time, simplifying the sampling measurementprocess and the calculation method, reducing the measurement difficulty and saving the measurement cost.

Description

technical field [0001] The invention relates to radiation detection technology, in particular to a method and a device for dynamically measuring soil potential radon concentration by using surface soil. Background technique [0002] Rocks and soils contain natural radioactive element uranium (radium), and the parent element uranium (radium) decays to produce radioactive radon gas. The chemical element radon, also known as radon, is a chemical element. The usual elemental form of radon is radon gas, which is a colorless, odorless, tasteless inert gas and is radioactive. When people inhale it, the decayed alpha particles of radon can cause radiation damage in the human respiratory system and cause lung cancer. [0003] Soil radon concentration is closely related to the indoor radon level of low-rise buildings and the radon level of underground buildings. Before design and construction, the soil radon concentration should be measured and evaluated to avoid building on foundat...

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Problems solved by technology

However, there are still some problems in this method. First, the measuring device is not closed and does not form a stable closed measurement environment. The airflow through the soil is not uniform, and the radon in the soil cannot be brought out evenly through the airflow, thereby affecting the accuracy of the measurement. In addition, when using the radon measuring instrument to measure the generation rate of radon in the soil, leakage and back-diffusion effects are not considered; in addition, according to the calculation method of this scheme, the important data soil porosity η is approximated by the type of soil look-up table Or take it back to the laboratory for measurement. The accuracy of the value is not high, which will lead to a large error in the obtained data, and the soil potential radon concentration cannot be accurately obtained.

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