Single-GM counting tube wide-range radiation detection method

Abstract

The invention belongs to the technical field of counting tube devices (G01T1 / 18), and relates to a method for realizing wide-range radiation detection by using a single-GM counting tube. The method comprises two parts of high pressure control and dosage rate calculation on the basis of a dead time correction principle, and range expansion of the GM counting tube is realized by respectively adopting a method of combining hardware dead time elimination and software piecewise interpolation correction. Due to the piecewise interpolation, nonideal factors can be reduced, and especially, the influence to a measurement result by inconsistency of parameters of elements is reduced. Testing results of dosage apparatus prototype manufactured according to the invention prove that the measurement linear range and the detection upper limit of a J305 low-range counting tube made in China can be improved by 1000 times, and the detection range is 0.1uGy / h-300Gy / h. By adopting the invention, the single-GM counting tube can meet use requirements of most of radiation detection occasions.

Description

technical field [0001] The invention belongs to the technical field of a counting tube device (G01T 1 / 18), and relates to a method for realizing wide range radiation detection by using a single GM counting tube. Background technique [0002] GM counter tube is the most commonly used nuclear radiation detector, and it is usually used to make dosimeters. Because the GM counter tube is affected by dead time during the measurement process, its measurement range is limited. In order to achieve a wide range (more than 8 orders of magnitude) measurement, two GM counter tubes are usually used to work together, one of which is a low-range counter tube and the other is a high-range counter tube, such as the utility model patent "Digital Gamma Radiation Detector" (Application No.: 201020115617.5) uses two GM counter tubes. The utility model patent "A Double GM Counter Automatic Switching Circuit" (application number: 200920173193.5) also designed a high and low range automatic switch...

AI Technical Summary

Problems solved by technology

When a pulse is output, the dead time has just ended and the GM counting tube has not recovered, and new particles are incident, which makes the GM counting tube continue to discharge, and eventually the pulse output amplitude is too low, and the circuit cannot accurately judge the number of output pulses. The strange phenomenon that the dose rate increases and the count rate decreases

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