可作为校准检定用标准剂量计的能量补偿型高气压电离室改进

Abstract

Abstract: In the ionizing radiation metrology work, the measurement results of the standard dosimeters are transferred to working metrological instruments through verification in order to achieve a unified unit and accurate and reliable quantity value. Due to low environmental gamma ray dose rate, the common PTW-UNIDOS series standard dosimeter can not meet the requirements for verification. An energy compensated high pressure ionization chamber was developed for this feature. The response characteristics of high pressure ionization chamber for X ray, gamma ray and cosmic ray were simulated using Monte Carlo method. Test results showed that the response deviation within the energy range of 87 keV—1.25 MeV for the ¹³⁷Cs gamma ray was less than 6% when the dose rate was about 30 μGy/h, the deviation in cosmic rays and ¹³⁷Cs gamma ray response was less than 10%, relative intrinsic error was -3% in the dose rate range of 0.5 μGy/h—1 mGy/h, the repeatability was 0.7% when the dose rate was 0.5 μGy/h, and the uncertainty of the calibration factor was 4% (k=2). The energy compensated high pressure ionization chamber can be used as a standard dosimeter in calibration and verification at environmental levels.

Key words: standard dosimeter, high pressure ionization chamber, Monte Carlo

CLC Number:

TL72

Gao Fei, Xiao Xuefu, Ni Ning, Hou Jinbing, Song Mingzhe. Development of energy compensated high pressure ionization chamber as standard dosimeter for metrological verification[J].RADIATION PROTECTION, 2017, 37(2): 87-93.

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Development of energy compensated high pressure ionization chamber as standard dosimeter for metrological verification

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