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Open-loop type method for measuring effective decay constant and radon exhalation rate synchronously

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

Active Publication Date: 2015-12-16
HENGYANG NORMAL UNIV
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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

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  • Open-loop type method for measuring effective decay constant and radon exhalation rate synchronously
  • Open-loop type method for measuring effective decay constant and radon exhalation rate synchronously
  • Open-loop type method for measuring effective decay constant and radon exhalation rate synchronously

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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...

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Abstract

The invention discloses an open-loop type method for measuring an effective decay constant and a radon exhalation rate synchronously. The method comprises a measurement process and a calculation process, analyzes radon concentration ascending curve data in a radon collection cover collecting chamber, corrects the existing calculation methods, and can obtain accurate radon exhalation rate through simple calculation. During the measurement process, the radon concentration is measured at short time interval, namely is measured every 2-10 minutes, and is measured for n periods till the radon concentration in the radon collection cover collecting chamber trends to be a constant value. During the calculation process, the radon concentration data of n periods obtained through measurement is defined as the radon concentration of the midpoint of the n periods, and a formula (7) is adopted for non-linear data fitting, thus the radon exhalation rate and the effective decay constant can be obtained synchronously.

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

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Application Information

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IPC IPC(8): G01T1/167G01N33/00
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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