"NPL Secondary Standard, Theray Level X-ray Exposure Meter"の使用経験

概要

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The performance of the "NPL Secondary Standard, Therapy Level X-ray Exposure Meter" has been checked up on the stability and repeatability with the ^<90>Sr source, ^<60>Co γ-ray and 10 MeV X-rays from linear accelerator. 1. The error of readings has been minimized through the use of the digital voltmeter with 0.1 mV in final digit (Fluke, Digital Multimeter 8,800 A). 2. The accuracy of measuring time has been improved through the use of the electronic digital timer with 0.01 second in final digit. 3. Through the checks of repeability, the standard deviation of the measured values has been observed to be lower than 0.04%. 4. Through the repeated stability checks with the ^<90>Sr source for 1 year, the difference of readings has been indicated 0.2% at maximum. 5. It is very important to hold the stability of dose meter that temperature, pressure and humidity should be measured through the accurate devices, and temperature and humidity in the room should be unified.
社団法人日本放射線技術学会の論文
1978-03-01