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Method for adjusting radon exhalation rate and effective decay constant of radon exhalation rate standard device

A radon exhalation rate and standard device technology, applied in the field of nuclear radiation detection, can solve problems such as insufficiency, and achieve the effect of simple measurement method

Active Publication Date: 2022-06-21
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] It is not sufficient to test the accuracy and reliability of the method and instrument for measuring the radon exhalation rate on the surface of the medium on a standard device. It is not sufficient to compare only under a certain effective decay constant condition, and it is necessary to be able to adjust the effective decay constant arbitrarily. method

Method used

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  • Method for adjusting radon exhalation rate and effective decay constant of radon exhalation rate standard device
  • Method for adjusting radon exhalation rate and effective decay constant of radon exhalation rate standard device
  • Method for adjusting radon exhalation rate and effective decay constant of radon exhalation rate standard device

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Embodiment 1

[0048] Embodiment 1. The device for adjusting the radon precipitation rate and the effective decay constant of the radon precipitation rate standard device, including a measuring instrument 1, a filter membrane 2, a drying tube 3, a radon collecting cover 4, a pump 5, a dense material plate 6, a gas outlet joint 7, Air inlet connector 8 , air flow type radon source 9 , adjustable micro pump 10 and flow meter 11 .

[0049] One end of the filter membrane 2 is connected to the measuring chamber of the measuring instrument 1 through a pipeline, the other end of the filter membrane 2 is connected to the drying tube 3 through a pipeline, the other end of the drying tube 3 is connected to the radon collecting cover 4 through a pipeline, and one end of the pump 5 passes through The pipeline is connected to the measuring chamber of the measuring instrument 1, the other end of the pump 5 is connected to the radon collecting cover 4 through the pipeline, the gas outlet joint 7 and the gas...

Embodiment 2

[0051] Embodiment 2, adopt the method for regulating radon precipitation rate standard device radon precipitation rate and effective decay constant as described in Example 1, including conventional radon precipitation rate The measurement process and the process of adjusting the radon precipitation rate and the effective decay constant of the radon precipitation rate standard device by using the air-flow radon source, the specific measurement process is as follows:

[0052] A. Conventional radon precipitation rate measurement process

[0053] The conventional radon extraction rate measurement process is as follows figure 2As shown, the radon collecting cover 4 with one side of the opening is buckled on the surface of the medium to be measured, because the radon atoms in the medium escape from the surface and enter the radon collecting cover 4 under the action of diffusion and seepage, resulting in the change of the radon concentration in the radon collecting cover 4. , the pu...

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Abstract

The device and method for adjusting the radon exhalation rate and the effective decay constant of the radon exhalation rate standard device, one end of the filter membrane in the device is connected with the measuring chamber of the measuring instrument through a pipeline, the other end of the filter membrane is connected with a drying pipe through a pipeline, and the other end of the drying pipe is One end is connected to the radon collecting hood through a pipeline, one end of the pump is connected to the measuring chamber of the measuring instrument through a pipeline, and the other end of the pump is connected to the radon collecting hood through a pipeline. It is connected to the adjustable micropump through the pipeline, the other end of the adjustable micropump is connected to the flowmeter through the pipeline, the other end of the flowmeter is connected to the flow-type radon source through the pipeline, and the other end of the flow-type radon source is connected to the inlet joint through the pipeline . The measurement method includes the conventional radon exhalation rate measurement process and the process of adjusting the radon exhalation rate and effective decay constant of the radon exhalation rate standard device. By adjusting the flow rate of the adjustable micropump in the device, the radon exhalation rate and effective decay constant can be adjusted. .

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method for adjusting the radon precipitation rate and the effective decay constant of a radon precipitation rate standard device by using a gas flow radon source. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of media such as soil. There are many methods and instruments for measuring the radon precipitation rate on the surface of the medium. Since the radon precipitation rate on the surface of the medium such as soil varies greatly with the changes of the temperature, humidity and air pressure of the environment, the accuracy and reliability of the method and instrument for measuring the radon precipitation rate on the medium surface need to be independent of the environment. Standard device for radon release rate for changes in temperature, humidity and air pressure. Some researchers have proposed to us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 谭延亮袁红志范钟凯胡滔林芬莫贻香谢若梅袁帅刘帅彬
Owner HENGYANG NORMAL UNIV
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