Synchronous value setting device and method for radon exhalation rate measuring instrument

Abstract

The invention, which relates to the technical field of nuclear radiation detecting, provides a synchronous setting apparatus and method of a radon precipitating rate measuring instrument. The synchronous setting apparatus comprises a filling block connected to the inner wall of a radon collection room of a radon precipitating rate measuring instrument detachably and a rapid radon precipitating rate setting unit connected in series to an air inlet pipe or an air return pipe. A radon precipitating rate value measured by the rapid radon precipitating rate setting unit is used as a standard for setting of the radon precipitating rate measuring instrument. To be specific, the rapid radon precipitating rate setting unit carries out equivalent processing on a changing radon concentration by usinga difference method; and on the basis of a corresponding scale factor value and alpha particle counting data collected by a detector during the measuring process, a radon concentration value of a next measuring cycle is calculated by combining a radon concentration value of a previous measuring cycle; The radon precipitating rate setting speed is fast; the time of radon precipitating rate measuring instrument setting is reduced substantially; the deviation caused by too long time during the setting process is reduced; and the setting value accuracy is enhanced.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a synchronous setting value device and method for a radon exhalation rate measuring instrument. Background technique [0002] The commonly used method to measure the radon exhalation rate on the surface of the medium is the accumulation method, that is, a radon collection chamber is fastened to the surface of the medium, and the radon exhalation rate in the radon collection chamber is measured for a period of time, and the radon exhalation rate can be deduced. The cumulative radon exhalation rate measuring instrument is a commonly used radon exhalation rate measuring instrument. The radon exhalation rate measuring instrument needs to be calibrated (fixed) after it is newly manufactured, in use and after maintenance to ensure its reliability. [0003] Chinese patent document CN105225267A discloses a kind of measuring system of radon exhalation rate (being the a...

AI Technical Summary

Problems solved by technology

This method takes a very long time to set the value each time. In the process of setting the value, repeated measurements are required to verify the repeatability. Ideally, the radon exhalation rate of the standard radon chamber will remain unchanged during the repeated measurements. However, limited by the actual environment, the radon exhalation rate of the standard radon chamber is not constant. For example, as time goes by, the ambient atmospheric pressure will change, and changes in air pressure will lead to changes in the radon exhalation rate, even within the same day. The radon exhalation rate in the afternoon will also be different from the radon exhalation rate in the morning, which will bring deviations to the measurement results, thus affecting the accuracy of the determination

In addition, for the monitoring team performing missions abroad, the radon exhalation rate measuring instrument must be sent to the location of the standard radon room for each setting operation. If the mission site is far away from the location of the standard radon room, the work efficiency will be greatly affected. and extremely inconvenient

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