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A method and device for dynamically measuring soil potential radon concentration using surface soil

A technology of dynamic measurement and surface soil, applied in the field of radiation detection, can solve the problems of not considering leakage and back diffusion effects, affecting measurement accuracy, uneven airflow, etc., achieving simple sampling measurement process and calculation method, saving measurement time, Avoid the side-to-side shaking effect

Active Publication Date: 2021-05-11
HENGYANG NORMAL UNIV
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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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  • A method and device for dynamically measuring soil potential radon concentration using surface soil
  • A method and device for dynamically measuring soil potential radon concentration using surface soil
  • A method and device for dynamically measuring soil potential radon concentration using surface soil

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Embodiment Construction

[0064] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0065] The invention provides a method for dynamically measuring soil potential radon concentration using surface soil, which is characterized in that: it includes a sampling process and a measurement and calculation process,

[0066] S1. Sampling process:

[0067] Utilize the steel ring knife 1-2 that is connected with the ring knife handle 1-1 volume by thread and be V, cut the top layer soil of natural state, make soil sample fill wherein, can not shake from side to side, so that the natural structure of soil is not destroyed, until Press the ring knife 1-2 into the soil completely, then dig out the ring knife 1-2 from the soil with a small shovel, take off the ring knife handle 1-1, and carefully trim and flatten the edges of the ring knife 1-2 with a small knife, remove excess soil;

[0068] After the trimming is completed, cover the upp...

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Abstract

A method and device for dynamically measuring soil potential radon concentration by using surface soil, by establishing differential equations for radon migration and distribution in soil, sampling surface soil, and then using the change law of radon concentration in a closed-loop gas circuit measurement device, Establish the formula of change law, change the volume of the measuring device to obtain the change of radon concentration in the measuring device under different measuring volumes, calculate the radon generation rate A and soil porosity η, and then use the calculated radon generation rate A and soil porosity The rate η was used to calculate the potential radon concentration in the soil. The invention utilizes the values ​​of n measurement periods in the measurement device to perform nonlinear fitting, without waiting for the radon concentration in the device to be stable, saving measurement time, simple sampling measurement process and calculation method, reducing measurement difficulty and saving 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N1/08G01T1/167
CPCG01N1/08G01N33/24G01T1/167
Inventor 袁红志谭延亮
Owner HENGYANG NORMAL UNIV
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