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Method for open-loop measurement of radon exhalation rate and effective decay constant of medium surface

A technology of radon precipitation rate and decay constant is applied in the field of nuclear radiation detection, which can solve the problems of large error of effective decay constant and radon precipitation rate, disadvantageous effective decay constant and radon precipitation rate, and inability to continuously monitor the change of radon precipitation rate. , to achieve the effect of simple measurement process and measurement method, reducing the amount of data calculation, and shortening the calculation process and time

Inactive Publication Date: 2019-03-08
HENGYANG NORMAL UNIV
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Problems solved by technology

The traditional open-loop method of measuring radon exhalation rate ignores the effect of effective decay constant
According to research, when the air exchange rate of the radon hood is not satisfied and is far greater than the effective decay constant, the measurement error is large
At present, there are also methods to obtain the effective decay constant, but they are relatively complicated
The Chinese patent with the application number CN201510634758.5 ​​discloses an open-loop method for synchronously measuring the effective decay constant and radon exhalation rate. This method can simultaneously measure the effective decay constant and radon exhalation rate. The results of the effective decay constant and radon exhalation rate have large errors. At the same time, the effective decay constant and radon exhalation rate are obtained by fitting the measurement data simultaneously. The data fitting calculation is relatively large, which is not conducive to measuring the surface of the medium in a short time. Effective decay constant and radon exhalation rate
[0004] The Chinese patent with the application number CN201110366385.X discloses a method for measuring the exhalation rate of radon by a two-stage method. This method includes a measurement process and a calculation process. By modifying the existing calculation method, a simple calculation method can be quickly passed A more accurate radon exhalation rate can be obtained, but this method is complex to calculate, and the closed-loop measurement device is used. Since it does not actively exchange air with the outside world, it can only be used for one-time measurement of the radon exhalation rate of the medium, and cannot continuously monitor the change of the radon exhalation rate.

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  • Method for open-loop measurement of radon exhalation rate and effective decay constant of medium surface
  • Method for open-loop measurement of radon exhalation rate and effective decay constant of medium surface
  • Method for open-loop measurement of radon exhalation rate and effective decay constant of medium surface

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Embodiment 1

[0045] as attached figure 1 As shown, the specific technical solution of the present invention is: a method for synchronously measuring radon precipitation rate and effective decay constant on the surface of a medium by two-period open-loop electrostatic collection method, including a measurement process and a calculation process.

[0046] S1. Measurement process:

[0047]Buckle the radon collecting hood 1 with one opening 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 radon collecting hood 1 with the opening under the action of diffusion and seepage, resulting in the radon collecting chamber in the open radon collecting hood 1 Collect indoor radon concentration changes. The pump 2 has been pumping the outside air into the open-collecting radon hood 1 at a constant flow rate. After mixing evenly with the air in the open-collecting radon hood 1, it is pumped i...

Embodiment 2

[0072] as attached figure 2 As shown, a two-period open-loop method for synchronously measuring radon exhalation rate and effective decay constant on the surface of a medium by the electrostatic collection method includes a measurement process and a calculation process.

[0073] S1. Measurement process:

[0074] Put the medium 8 to be measured into the collection chamber of the airtight radon collection hood 7, because the radon atoms in the medium 8 to be measured 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 airtight radon collection hood 7 Collect indoor radon concentration changes. The pump 2 has been pumping the outside air into the airtight radon collection hood 7 at a constant flow rate. After mixing evenly with the air in the airtight radon collection hood 7, it is pumped into the drying pipe 3, and then sent to the electrostatic collection method radon meas...

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Abstract

The invention provides a method for synchronous measurement of a radon exhalation rate and an effective decay constant of a medium surface in two-cycle open loop mode through adoption of an electrostatic collection method. The method can rapidly obtain the accurate radon exhalation rate through a simple calculation method by correcting the current calculation method. The method employs an electrostatic collection method radon measurement instrument to consider the effective decay constant of the radon, and the radon concentration change rule expression is employed to solve a radon exhalation rate J and the effective decay constant through adoption of an integral formula. The method only employs two cycles of measurement data to rapidly measure the radon exhalation rate and the effective decay constant of the medium to be measured through adoption of the simple algebraic operation, and the measurement device is simple and convenient to operate, reduce the data calculation amount, shortens the calculation process and time and meets the demand of rapid measurement of the radon exhalation rate and the effective decay constant; and moreover, two measurement cycles are continuously measured in a long time interval to effectively reduce the measurement errors caused by statistical fluctuations and improve the measurement accuracy.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to an open-loop method for measuring radon precipitation rate and effective decay constant on the surface of a medium. Background technique [0002] The 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 time has important statistical signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/167
Inventor 袁红志谭延亮
Owner HENGYANG NORMAL UNIV
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