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Radon measuring device and radon measuring method

A technology of a measuring device and a measuring mechanism, which is applied in the field of radon concentration measurement, can solve the problems of inability to measure radon and radon progeny at the same time, inconvenient use of instruments, low measurement accuracy, etc., and achieves strong practicability, simple operation, and accurate measurement results. Effect

Pending Publication Date: 2021-11-26
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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Problems solved by technology

[0005] However, in actual use, there are many instruments that only measure radon, and radon and radon daughters cannot be measured at the same time, resulting in low measurement accuracy, and the disadvantages of inconvenient use of the instrument and slow measurement speed

Method used

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  • Radon measuring device and radon measuring method

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Embodiment approach

[0097] The embodiment is specifically: the purpose of the instrument threshold comparison circuit is to output a high level when the output signal of the signal amplification circuit is higher than the set threshold, otherwise, output a low level. The essence of the threshold comparison circuit is a comparator. The input of the comparator is two analog signals, and the output is a high and low digital level. As long as the magnitude of the two input analog signals is determined, no matter the difference between the input voltage increases or decreases, tor output remains constant. In theory, all op amps can be used as comparators without feedback. In fact, due to the very high open-loop gain of the operational amplifier, it can only handle signals with very small input differential voltages. In addition, the response time of the operational amplifier is relatively long, and it lacks special functions such as hysteresis and internal reference. After testing, the commonly used...

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Abstract

The invention discloses a radon measuring device and a radon measuring method, and particularly relates to the field of radon concentration measurement, and the radon measuring device comprises an instrument box body, and a radon measuring mechanism and a radon measuring system which are installed in the instrument box body; the radon measuring mechanism comprises a radon measuring chamber, a radon daughter filter, a drying pipe, an electromagnetic valve A, an electromagnetic valve B, a flowmeter and a sampling pump; and the radon measuring system comprises an amplifier, a threshold discrimination circuit, a counting circuit, a control circuit and a power supply circuit. To-be-measured air after radon daughters are filtered is collected into a radon measuring chamber through a sampling pump, radon in the measuring chamber is decayed into the radon daughters, [alpha] radioactive decay on a filter membrane is measured, multi-time-period measurement is conducted, the radon daughter concentration is calculated through adoption of a weighted least square method, The whole measuring device can measure radon and radon daughters at the same time, the measuring precision is high, and two measuring modes including a standard measuring mode and a rapid measuring mode are adopted, one mode achieves high-precision measurement, and the other mode achieves rapid measurement.

Description

technical field [0001] The invention relates to the field of radon concentration measurement, in particular to a radon measurement device and a measurement method. Background technique [0002] Radon daughters, the general term for the short-lived decay products of 222Rn, are mainly Po(RaA), Pb(RaB), Bi(RaC) and Po(RaC'). The harm of radon to human health is mainly due to the damage to the respiratory organs caused by the internal irradiation of radon and its progeny α particles. Most radon measurement methods in geological prospecting use radon progeny as the measurement object. [0003] Radon measurement (radon survey) is a kind of emanation measurement, which is a kind of method to measure the concentration of radon and its progeny in soil air, atmosphere and water with a radon meter. In addition to being used for geological prospecting and solving related geological problems, radon gas measurement is also widely used in other fields, such as environmental investigation ...

Claims

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Application Information

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IPC IPC(8): G01T1/167G01T1/24
CPCG01T1/167G01T1/24
Inventor 王攀王晓琼杨明理孙雪云胡鹏华周磊陈刚初旭阳
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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