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Medium surface radon exhalation rate continuous measurement method and apparatus

A medium surface, radon precipitation rate technology, applied in the field of nuclear radiation detection, can solve the problems of delay effect, no continuous measurement of radon precipitation rate, difficult to achieve rapid response requirements for earthquake prediction, etc., to achieve uniform concentration and easy measurement operation. Effect

Inactive Publication Date: 2015-05-13
NANHUA UNIV +1
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Problems solved by technology

[0003] Invention patent "Method and device for measuring radon exhalation rate on medium surface" provides a method based on electrostatic collection method to measure radon exhalation rate on media surface, although it can eliminate leakage, back diffusion, environmental radon and thoron interference, This method uses the cumulative method to measure the exhalation rate of radon, which is less affected by external conditions. Although it has high measurement accuracy, in order to improve the measurement accuracy, the current method uses the least square method to calculate A and B after multiple measurements. The λe and J are calculated without continuous measurement of the radon exhalation rate, but only for a single measurement of the radon exhalation rate on the surface of the medium
The invention patent "Closed-loop Continuous Measurement of Radon Exhalation Rate Method" cannot quickly respond to the change of radon exhalation rate (the half-life of radon is 3.825d), there is a serious delay effect, and it is difficult to realize earthquake prediction using radon as a tracer nuclide quick response needs

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  • Medium surface radon exhalation rate continuous measurement method and apparatus
  • Medium surface radon exhalation rate continuous measurement method and apparatus
  • Medium surface radon exhalation rate continuous measurement method and apparatus

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

[0051] A method for continuously measuring the exhalation rate of radon on the surface of a medium, comprising the following steps:

[0052] Step 1: Measure the initial radon concentration C 0 ;

[0053] Turn on the sampling pump and sample the radon-containing air in the measured environment (the external environment on the surface of the medium) at a flow rate of 0.1-12L / min. The sampling time is ΔT. At this time, the radon concentration in the measurement room is the initial time t=0. The radon concentration of the radon mask is the initial radon concentration C 0 ;

[0054] Step 2: Calculate the radon exhalation rate on the surface of the medium;

[0055] (c) First determine A, B and the equivalent decay constant λe as follows:

[0056] Buckle the radon collecting hood with openings and stirring function on the surface of the mediu...

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Abstract

The invention discloses a medium surface radon exhalation rate continuous measurement method and apparatus. The method includes the steps of Step 1 measuring the initial radon concentration C0; Step 2 calculating the medium surface radon exhalation rate; determining A, B and the equivalent decay constant lambda e through the following method: the relationship of radon concentration in a radon collection shield at the n and n-1 measurement is: Cn=A+BCn-1; (b1) in a radon cumulation process: as shown in the description; (b2) in a radon dynamic equilibrium process: as shown in the description. The medium surface radon exhalation rate continuous measurement method and apparatus can achieve continuous measurement and is high in measurement efficiency.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method and a measuring device for rapidly, reliably and continuously measuring the radon exhalation rate on the surface of a medium. Background technique [0002] The radon exhalation rate refers to the radioactive activity of radon emanating from the surface of the medium per unit area and unit time. Radon exhalation rate measurement is affected by sampling conditions and ambient temperature, humidity and air pressure conditions, making it difficult to control the accuracy of the measurement results, and the measurement results are often difficult to reproduce and compare. However, the measurement of radon exhalation rate is a key link in evaluating the effectiveness of radon prevention coverage in waste rock yards and tailing ponds in the decommissioning treatment of uranium mining and metallurgy facilities, and it is also a means to find source terms in the treatme...

Claims

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Application Information

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IPC IPC(8): G01T1/167
Inventor 肖德涛李志强赵桂芝
Owner NANHUA UNIV
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