Standard radon chamber 222Rn/220Rn mixing concentration automatic constant value measuring system and method

Abstract

A standard radon chamber 222Rn/220Rn mixed concentration automatic constant value measuring system comprises a spherical scintillation chamber, a radon and thorium analyzer, a radon and thorium concentration automatic constant value calibrator and a PC. The radon and thorium concentration automatic constant value calibrator comprises a high-voltage power supply, a low-voltage power supply, a signal amplifier, a single-channel pulse amplitude analyzer and an FPGA signal measuring and processing module. And the PC comprises a background measurement module, a sample measurement module, a data storage module, a self-checking module and a display. The invention discloses an automatic constant value measurement method for 222Rn/220Rn mixed concentration of a standard radon chamber. The automatic constant value measurement method comprises the following steps of: 1, self-checking a counting function of an FPGA (Field Programmable Gate Array) signal measurement processing module; 2, measuring a background counting rate; and 3, measuring the mixed concentration of 222Rn/222Rn. According to the invention, automatic valuing of the 222Rn/220Rn mixed concentration of the standard radon chamber can be realized, so that the calibration process of the radon and thorium concentration measuring instrument is simpler, more convenient and more intelligent, and the problems that a scintillation chamber method for valuing the 222Rn/220Rn mixed concentration of the standard radon chamber at present is low in automation degree, unattended operation is not realized, the 222Rn concentration needs to be manually calculated, and data cannot be automatically stored are solved.

Description

technical field [0001] The invention relates to the technical field of metering devices, in particular to a standard radon chamber 222 Rn / 220 Rn mixed concentration automatic fixed value measurement system and method. Background technique [0002] The standard radon chamber is a standard device used for value transfer and experimental research. It is mainly used in the verification, calibration and testing of radon concentration measuring instruments. It is also widely used in radiation protection, radioactive environmental protection, radon prospecting, earthquake prediction and other fields. Great application value. Accurately measure radon in standard radon chambers 222 Rn / 220 The mixed concentration of Rn is of great significance to the verification, calibration and testing of radon and thoron concentration measuring instruments, and the standard radon chamber 222 Rn / 220 Rn concentration automatic setting method for air 222 Rn / 220 Accurate measurement of Rn c...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a kind of standard radon chamber 222 Rn/ 220 Rn mixed concentration automatic fixed value measurement system and method, which solves the problem of currently used standa

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