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A radon concentration control method for portable radon meter calibrator

A control method and technology of radon concentration, which is applied in the field of radiometrics, can solve problems such as unsatisfactory radon concentration control, slow radon supplementation speed, and inability to automatically control radon concentration

Active Publication Date: 2017-09-12
EAST CHINA UNIV OF TECH
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Problems solved by technology

[0003] The above methods may need to set the initial parameters of radon concentration (such as methods 1, 2, 3), or the speed of radon supplementation is too slow (such as method 4), or cannot automatically control the radon concentration (such as methods 1, 2), etc., which cannot meet the requirements of portable measurement. The radon concentration control requirements of the radon meter calibrator (no additional radon concentration monitoring instrument in the radon chamber, no need to input any environment-related radon concentration initial parameters, etc.), can quickly reach the radon concentration point required for instrument calibration

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  • A radon concentration control method for portable radon meter calibrator
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  • A radon concentration control method for portable radon meter calibrator

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Embodiment Construction

[0023] The present invention will be described in more detail through the accompanying drawings and specific embodiments below. By to a newly made volume, the portable radon meter calibrator of 60L, according to the scheme described in this invention, has designed such as figure 1 The shown control structure diagram controls the radon gas concentration, and the radon concentration control error in the radon box 16 is set to be 5‰, and the adsorption and leakage rate of the radon box 16 obtained by the previous test is 3.7×10 -6 Bq, the radon concentration control process is as follows: figure 2 , the specific steps are:

[0024] ① Simultaneously open electronic 4 and 11, close electronic valve 5-10, open controllable flow pump 14, and eliminate the radon gas continuously produced in 15 solid radon generator, and this process runs for 40 minutes.

[0025] ② Simultaneously open the electronic valves (5, 7, 9), close the electronic valves (4, 6, 8, 10, 11), use the nitrogen in...

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Abstract

The invention relates to a radon concentration control method for a calibrator of a portable radon measuring instrument, which uses a method of combining continuous radon supplementation with airflow and closed cycle cumulative radon concentration control. Firstly, high-purity nitrogen is used in the mode of continuous radon supplementation with airflow Eliminate the influence of the radon background value in the air inlet of the solid radon generator existing in the control method of the radon meter calibrator on the final radon concentration control accuracy of the radon meter calibrator. Taking advantage of the fast and stable advantages of the closed loop cumulative radon concentration control scheme, after obtaining a stable radon concentration point in the flow mode, switch to the closed loop cumulative radon concentration control mode. The invention discloses a radon concentration control realization mode and a parameter calculation method in the whole control process. Therefore, the method solves the problem that the radon concentration control of the portable radon measuring instrument calibrator is inconvenient to set the initial environmental parameters, and does not need an external radon monitoring instrument, and quickly reaches the stable radon concentration point required for calibrating the radon measuring instrument.

Description

technical field [0001] The invention belongs to the field of radiation metrology, and relates to a radon concentration control method for a calibrator of a portable radon measuring instrument. This method does not need to set any initial concentration parameters related to the environment, and can stably obtain the stable radon concentration points required for the calibration of radon measuring instruments without using external monitoring instruments. Background technique [0002] The calibrator of the portable radon measuring instrument is designed to meet the application requirements of some industries. The volume of the whole machine is less than 0.5 cubic meters. The additional radon concentration monitoring instrument does not set the initial parameter of radon concentration related to the environment, and can quickly obtain the stable radon concentration point required for calibrating the instrument, which is suitable for rapid on-site calibration of fixed-installati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D11/13G01T1/16
Inventor 瞿金辉张雄杰王仁波
Owner EAST CHINA UNIV OF TECH
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