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Method and device for measuring radon separation rate in adaptive open loop way

A radon extraction rate and self-adaptive technology, applied in the field of nuclear radiation detection, can solve the problems of low radon concentration, large statistical fluctuation, and difficult measurement of radon concentration, and achieve the effect of simple calculation and improved measurement efficiency

Inactive Publication Date: 2011-06-29
HENGYANG NORMAL UNIV
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Problems solved by technology

However, a very important parameter in the open-loop measurement of radon exhalation rate measurement is the flow rate of the pump. For a medium with a high exudation rate, a higher flow rate can reduce the time for the radon concentration to reach a constant level and improve the measurement efficiency; For medium with low leaching rate, a higher flow rate will lead to low radon concentration in the radon collection hood, large statistical fluctuations, and even make it difficult to measure the radon concentration in the radon collection hood

Method used

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  • Method and device for measuring radon separation rate in adaptive open loop way
  • Method and device for measuring radon separation rate in adaptive open loop way
  • Method and device for measuring radon separation rate in adaptive open loop way

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Embodiment 1

[0038] Embodiment 1. In this embodiment, the self-adaptive open-loop measuring device for radon exhalation rate provided by the present invention is used for measurement. During the measurement, the radon collecting cover 2 is fastened on the surface of the medium 1 to be measured, and then the air pump 6 is turned on to continuously pump it in from the outside. Clean air (generally speaking, the outdoor air radon concentration is several Bq / m 3 , can be approximately zero. ), the change of radon concentration in the set radon hood can be described by formula (1):

[0039] (1)

[0040] J is the radon exhalation rate on the surface of the measured medium; S is the bottom area of ​​the radon cover 2; V is the space volume of the radon cover 2; L is the flow rate of the air pump 6; Be the change of radon concentration caused by the decay of radon in the radon cover 2; λ is the decay constant of radon ( ); C(t) is the concentration of radon accumulated in the radon co...

Embodiment 2

[0061] Embodiment 2. In this embodiment, the self-adaptive open-loop measuring device for radon exhalation rate provided by the present invention is used for measurement. When a device with a solenoid valve is used for measurement, in the first few cycles of the measurement, the solenoid valve 8 is closed, the three-way solenoid valve 7A-C is opened, B-C is closed, and the flow rate of the air pump 6 is relatively high, so that there is no flow from the outside The air is sucked in, and the air in the radon cover 2 and the air in the measuring room of the radon measuring instrument 5 are circulated at a high speed. It can be approximately considered that the radon concentration in the measuring room of the radon measuring instrument changes according to formula (6), and only the volume in formula (6) V not only includes the volume of the radon collecting hood, but also needs to include the volume of the measuring chamber of the radon measuring instrument 5 . which is:

[0062...

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Abstract

The invention provides a method and device for measuring radon separation rate in an adaptive open loop way, wherein the radon separation rate is measured in an open loop way; approximate value J1 of the radon separation rate is automatically obtained via measurement data in former measuring periods; then flow rate of an air pump is adjusted adaptively so as to exactly measure to obtain the radon separation rate. The measuring device consists of a radon collection cover, a controller, a flow meter, a radon measuring instrument and an air pump with adjustable flow rate, wherein an air outlet of the radon collection cover is connected with the air pump via a pipeline; the air pump is connected with an air inlet of the radon measuring instrument via the pipeline; the air outlet of the radon measuring instrument is connected with the flow meter via the pipeline; the controller is connected with the radon measuring instrument, the flow meter and the air pump with the adjustable flow rate via circuits; the measuring data of the radon measuring instrument and flow meter are transmitted to the controller, and the controller controls the flow rate of air pump with the adjustable flow rate.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method and device for measuring radon exhalation rate on the surface of a medium. Background technique [0002] The radon exhalation rate refers to the activity of radon that is exuded into the air through a unit area of ​​the medium surface in a unit time. Measuring the radon exhalation rate on the surface of the medium is one of the important means to evaluate the natural radiation level and evaluate whether the decommissioning treatment of uranium mines is qualified. Cumulative method, open-loop method and activated carbon adsorption method are commonly used methods to measure radon exhalation rate. The activated carbon adsorption method requires a long measurement time, and the measurement results cannot be obtained quickly; the accumulation method is to buckle a radon collection cover on the surface of the emanation medium, and seal the surrounding area with an ...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01T1/167
Inventor 谭延亮
Owner HENGYANG NORMAL UNIV
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