Geiger Muller counter tube dosage rate measuring range extension method and device

Abstract

The invention provides a Geiger Muller (GM) counter tube dosage rate measuring range extension device which comprises a GM counter tube, a first electronic switch, a second electronic switch, a load resistor, a variable resistor, a blocking condenser and a time measurement and control unit. The invention further provides a GM counter tube dosage rate measuring range extension method by utilization of the device. The GM counter tube dosage rate measuring range extension device provides positive high voltage for the positive electrode of the GM counter tube and provides negative high voltage for the negative electrode of the GM counter tube, wherein the high voltage of one electrode can be connected and disconnected quickly under the controlling and driving functions of external signals so that the GM counter tube can switch quickly between a working state and a dormant state, influence of dead time of the GM counter tube on measurement is avoided, the dosage rate measuring range can be extended effectively, linearity is improved, and the service life of the GM counter tube is prolonged. According to the GM counter tube dosage rate measuring range extension device, the dosage rate can be obtained through direct calculation according to a given dosage rate formula just by measuring effective working time of the GM counter tube, and the dosage rate highly coincides with calibration scale data of a national first-level metering station.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a method and a device for expanding the dose rate range of a Geiger-Miller counter tube. Background technique [0002] Geiger-Müller counters are referred to as GM counters. Because of their high sensitivity, large pulse amplitude, good stability, and ability to adapt to many harsh environments, and are easy to use and low in price, they are widely used to detect ionizing radiation. They are used in reactor radiation monitoring, Staff dose monitoring, environmental radiation monitoring and other applications are very extensive. At present, military and civilian nuclear radiation monitors at home and abroad use a large number of GM counting tubes as detectors, such as the American AN / VDR series radiometer, the Austrian SSM-1 multi-purpose radiometer, the Finnish RDS series nuclear radiation monitor, and my country's FFS06 radiometer And PDM series personal dosi...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method and device for expanding the dose rate range of a Geiger-Miller counter tube, which enables the GM counter tube to switch between working and dormant states, avoids the influence of the GM counter tube dead time on the dose rate measurement, and can Solve the problem of narrow range and poor linearity of GM counter tube, greatly expand the dose rate range of GM counter tube, and improve linearity

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