Method and device for low-power radiation dose rate detection and wide-range scaling graduation

Abstract

The invention provides a method for low-power radiation dose rate detection and wide-range scaling graduation. The working mode of a GM counting tube is controlled by use of a timing sequence so as to eliminate the dead time of the GM counting tube in hardware and reduce the discharge power consumption of the GM counting tube; a voltage conversion unit is controlled to work intermittently so that the no-load consumption of the system can be reduced under the premise of guaranteeing correct detection; a backward voltage is applied to reduce the consumption of quenching bodies and the damage to an anode wire in the discharge process of the GM counting tube; device graduation can be realized by use of a polynomial interpolation method. The method for low-power radiation dose rate detection and wide-range scaling graduation is capable of realizing hardware dead time correction and has the potential of prolonging the service life of the GM counting tube; after the graduation of the dose rate detection device and the determination of each scale coefficient ai,k (k=m, m-1, ..., 1, 0) in a formula (1), the influence of an unknown error on the measurement result can be reduced and a relatively accurate dose rate can be obtained at last.

Description

technical field [0001] The invention relates to the field of nuclear radiation detection, in particular to a radiation dose rate low power consumption detection and wide range calibration method and device. Background technique [0002] The GM counter tube is one of the most commonly used nuclear radiation detectors. It has a simple structure and a large output pulse amplitude. It is usually used to make dose detection devices, such as the domestic FJ3200 personal dosimeter, WF-GM-F digital double GM tube detector , Foreign MiniRadic personal dosimeters, ADM-300 multi-function measuring instruments are all made of GM counter tubes. [0003] In the traditional detection method using GM counter tube, there are four shortcomings, one of which is that there is a lot of waste of electric energy in the measurement circuit. The GM counter tube needs high voltage when it works, and there is a high-voltage conversion unit in the general radiation detection device to convert the inpu...

AI Technical Summary

Problems solved by technology

There are four shortcomings in this method: first, the power consumption of the circuit is relatively large, even larger than that of the traditional GM counter tube detection method

The main reason is that the load resistors R5 and R6 always have current flowing through them. When there is no particle incident, these two voltage divider resistors are also constantly consuming current, resulting in waste of electric energy.

Second, the instrument is not calibrated, and the dose rate calculation process is complicated

Third, count rate calculations are not reliable when no more than one particle is incident within the processing time

Fourth, the life extension of GM digital tube is not enough

However, the electrons generated during the discharge process will still bombard the anode of the counter tube at high speed, and the anode of the counter tube will continue to be damaged, so that its life is not extended much.

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