Open-loop method for synchronous measurement of effective decay constant and radon exhalation rate

A technology of simultaneous measurement and radon extraction rate, applied in the field of nuclear radiation detection, can solve the problems of complexity and large measurement error, and achieve the effect of accurate results, simple measurement process and calculation method

Active Publication Date: 2018-02-27
HENGYANG NORMAL UNIV
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional open-loop method of measuring the radon exhalation rate ignores the influence of the effective decay constant, but the research shows that: when the air exchange rate of the radon hood collection chamber is not satisfied and is far greater than the effective decay constant, the measurement error is large
At present, there is also a method to obtain the effective decay constant by using two measurements, but it is more complicated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Open-loop method for synchronous measurement of effective decay constant and radon exhalation rate
  • Open-loop method for synchronous measurement of effective decay constant and radon exhalation rate
  • Open-loop method for synchronous measurement of effective decay constant and radon exhalation rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment one, as attached figure 1 As shown, an open-loop method for synchronously measuring the effective decay constant and radon exhalation rate, including the measurement process and calculation process, through the analysis of the radon concentration rising curve data in the collection room of the radon hood, the existing calculation method is corrected , and a more accurate radon exhalation rate can be obtained by simple calculation. Its specific operation is as follows:

[0039] 1. Measurement process:

[0040] Buckle the opening-collecting radon cover 1 on the surface of the medium 6 to be measured, because the radon atoms in the medium 6 to be measured escape from the surface and enter the collection chamber of the opening-collecting radon cover 1 under the action of diffusion and percolation, resulting in the opening-collecting radon cover 1 As the concentration of radon in the collection chamber changes, the pump 2 always draws the outside air from the ai...

Embodiment 2

[0064] Embodiment two, as attached figure 2 As shown, an open-loop method for synchronously measuring the effective decay constant and radon exhalation rate, including the measurement process and the calculation process, through the analysis of the radon concentration rise curve data in the collection room of the radon hood, the existing calculation method is corrected , and a more accurate radon exhalation rate can be obtained by simple calculation. Its specific operation is as follows:

[0065] 1. Measurement process:

[0066] Put the medium to be measured 8 into the collection chamber of the airtight radon collection hood 7, because the radon atoms in the medium to be measured 8 escape from the surface and enter the collection chamber of the airtight radon collection hood 7 under the action of diffusion and seepage, resulting in the collection of radon in the airtight radon collection hood 7. As the indoor radon concentration changes, the pump 2 draws the outside air fro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An open-loop method for synchronously measuring the effective decay constant and radon exhalation rate, including the measurement process and the calculation process, through the analysis of the radon concentration rise curve data in the collection room of the radon hood, the existing calculation method is corrected, and the A more accurate radon exhalation rate can be obtained by simple calculation. The measurement process adopts a short time interval measurement, that is, a measurement every 2-10 minutes, and n cycles of measurement until the radon concentration in the radon hood collection room tends to a constant value. In the calculation process, the measured radon concentration data of n periods is defined as the radon concentration at the midpoint of n periods, and then the nonlinear data fitting is carried out by using formula (7), so that the radon exhalation rate and effective decay constant can be obtained simultaneously.

Description

technical field [0001] The invention relates to a method for measuring radon exhalation rate in the technical field of nuclear radiation detection, in particular to an open-loop method for synchronously measuring effective decay constant and radon exhalation rate. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of the medium. The main methods for measuring the precipitation rate of radon on the surface of the medium include the accumulation method, the open-loop method, and the activated carbon adsorption method. The activated carbon adsorption method is to use activated carbon to adsorb the precipitated radon, and obtain the radon precipitation rate by measuring the γ spectrum generated by the decay of radon adsorbed in the activated carbon. This method takes a long time to measure and is not easy to automate; the accumulation method is mainly used for measuring The average radon exhalation rate over a period of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167G01N33/00
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap