Acta Metrologica Sinica  2022, Vol. 43 Issue (8): 1095-1102    DOI: 10.3969/j.issn.1000-1158.2022.08.19
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Calibration and Uncertainty Analysis of Protective Level X-ray Ionization Chambers
QU Bing-bing1,2,WU Jin-jie2,LU Ping-zhou1,2,LI Meng-yu1,2,SONG Fei1,2,ZHANG De-liang2,MA Ying-jie1,ZHAO Rui2
1. College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. National Institute of Metrology, Beijing 100029, China
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Abstract  The protection level ionization chamber dosimeters are main measuring instrument for radiation protection and need to be calibrated under narrow spectrum series reference radiation qualities. The EGSnrc software was used to simulate the X-ray energy spectrum of the reference radiation quality. The maximum deviations of the spectral resolution and average energy obtained from the analysis and the recommended values of ISO 4037-1 were 7.1% and 1.04%, respectively, which met the specification requirements. Based on the (60~250) kV X-ray air kerma national primary standard, the air kerma at the reference point of 1m from the X-ray tube spot was reproduced under the narrow spectrum series reference radiation quality, and then two transfer ionization chambers were calibrated and transferred by the substitution method.Finally, the PTW-32002 spherical ionization chamber was calibrated by using the air specific release kinetic energy rate at 2.25m reproduced by the transfer ionization chamber, and the corresponding calibration factor was obtained. The relative expanded uncertainty of the calibration factor was 2.2%(k=2).
Key wordsmetrology      ionization chamber dosimeter;narrow spectrum series radiation quality      X-ray      air kerma      substitution method      uncertainty     
Received: 20 October 2021      Published: 20 August 2022
PACS:  TB98  
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QU Bing-bing
WU Jin-jie
LU Ping-zhou
LI Meng-yu
SONG Fei
ZHANG De-liang
MA Ying-jie
ZHAO Rui
Cite this article:   
QU Bing-bing,WU Jin-jie,LU Ping-zhou, et al. Calibration and Uncertainty Analysis of Protective Level X-ray Ionization Chambers[J]. Acta Metrologica Sinica, 2022, 43(8): 1095-1102.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.08.19     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I8/1095
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