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Standard device and method for arbitrarily and actively adjusting radon exhalation rate and effective decay constant

A technology of radon precipitation rate and decay constant, which is applied in the field of nuclear radiation, can solve problems such as insufficient sufficiency, and achieve the effects of adjusting the precipitation rate, simple and reliable adjustment method, and effective decay constant adjustment.

Active Publication Date: 2016-09-07
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 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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  • Standard device and method for arbitrarily and actively adjusting radon exhalation rate and effective decay constant
  • Standard device and method for arbitrarily and actively adjusting radon exhalation rate and effective decay constant
  • Standard device and method for arbitrarily and actively adjusting radon exhalation rate and effective decay constant

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Effect test

Embodiment 1

[0039] Embodiment 1. A standard device for actively and arbitrarily adjusting radon exhalation rate and effective decay constant, including a panel 10 , an adjustable micropump 11 , a flow meter 12 and an adsorption tube 13 .

[0040] The panel 10 is provided with an air inlet joint 10-1 and an air outlet joint 10-2. The panel 10 is a plane plate made of a dense material that does not contain radium. When radon exhalation rate is measured, the panel 10 made of dense material can block back diffusion of solid radon source.

[0041] The dense material is glass and stainless steel.

[0042] The adsorption tube 13 is equipped with an adsorption material capable of adsorbing radon, and the adsorption material is activated carbon.

[0043] One end of the air outlet joint 10-2 on the panel 10 is connected with the air inlet of the adjustable micropump 11 through a pipeline, and the air outlet of the adjustable micropump 11 is connected with the air inlet of the flowmeter 12 through ...

Embodiment 2

[0045] Embodiment two, actively arbitrarily adjusting the standard device of radon exhalation rate and effective decay constant, with reference to embodiment one, different from embodiment one is: the air outlet of flow meter 12 is disconnected from the air inlet of adsorption tube 13, through Control the flow rate of the micropump 11 to adjust the effective decay constant , and adjust the radon exhalation rate by using solid radon sources 8 with different activities. Because the radon in the closed space formed by the opening radon cover 5 and the panel 10 cannot escape into the outside atmosphere through leakage and back diffusion effect, it can only be drawn out by the adjustable micropump 11 with the air and enter the outside air through the flowmeter 12. After the radon in the air is adsorbed by the adsorbent material in the adsorption tube 13, the radon-free air enters the closed space formed by the opening set radon cover 5 and the panel 10, so that the leakage and lea...

Embodiment 3

[0046] Embodiment three, actively arbitrarily adjusts the standard device of radon exhalation rate and effective decay constant, with reference to embodiment one, and embodiment one difference is: replace panel 10 with airtight shape collection radon cover 7, the airtight shape collection radon cover 7 The air outlet joint 7-2 is connected with the air inlet of the adjustable micropump 11 through the pipeline, and the air outlet of the adjustable micropump 11 is connected with the air inlet of the flowmeter 12 through the pipeline, and the air outlet of the flowmeter 12 is connected with the adsorption pipe through the pipeline. The air inlet of pipe 13 is connected, and the air outlet of adsorption pipe 13 is connected with air inlet connector 7-1 on the airtight radon cover 7 by pipeline.

[0047] During the measurement, the solid radon source 8 is placed in the airtight collecting radon cover 7, and the effective decay constant is adjusted by controlling the flow rate of the...

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Abstract

The invention provides a standard device and method for arbitrarily and actively adjusting radon exhalation rate and effective decay constant. The standard device comprises a panel, an adjustable micro pump, a flowmeter and an adsorption tube. The panel is provided with an inlet connector and an outlet connector. One end of the outlet connector on the panel is connected with an air inlet of the adjustable micro pump through a pipeline; an air outlet of the adjustable micro pump is connected with an air inlet of the flowmeter; an air outlet of the flowmeter is connected with an air inlet of the adsorption tube through a pipeline; an air outlet of the adsorption tube is connected with the inlet connector on the panel; an opening radon collection cover is covered on the panel, and the inlet connector and the outlet connector are covered in the opening radon collection cover. During measuring, a solid radon source is placed on the panel, and the opening radon collection cover is covered on the panel; and the effective decay constant [lambda]e is adjusted by controlling the flow rate of the adjustable micro pump, and the radon exhalation rate is adjusted through the solid radon sources with different activities.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation, in particular to a standard device and method for actively arbitrarily adjusting radon exhalation rate and effective decay constant. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of soil and other media. There are many methods and instruments for measuring the radon precipitation rate on the surface of the medium. Since the exhalation rate of radon on the surface of soil and other media varies greatly with the change of the temperature, humidity and air pressure of the environment, it is necessary to check the accuracy and reliability of the method and instrument for measuring the exudation rate of radon on the surface of the media, without being affected by the environment. Radon exhalation rate standard device for temperature, humidity and air pressure changes. The existing technology uses the change of the number and ar...

Claims

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Application Information

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IPC IPC(8): G01T7/00
CPCG01T7/005
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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