Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 70(5): 329-334 (2021)

技術報告Technical Report

高線量率密封小線源の測定における線源補正係数ksourceの算出60Co線源及び192Ir新型線源への適用Determination of Radiation Quality Correction Factor ksource for HDR BrachythrrapyApplication to 60Co Sources and New 192Ir Source

1公益社団法人日本アイソトープ協会Japan Radioisotope Association

2国立研究開発法人産業技術総合研究所The National Institute of Advanced Industrial Science and Technology

受付日:2021年2月18日Received: February 18, 2021
受理日:2021年4月5日Accepted: April 5, 2021
発行日:2021年11月15日Published: November 15, 2021


Responses of well-type ionization chambers for HDR brachytherapy may depend on source models and chamber models. This work determined a radiation quality correction factor ksource. Two types of 60Co sources and two types of 192Ir sources including a new source model were used for this study. This correction factor can convert the calibration coefficient for reference air kerma rate of mHDR-V2r to that of the other source models. We have reported source geometry factors ksg which are applied to VS2000 and Ir2.A85-2 users in 2019. In this study, ksg was updated to ksource, which made it possible to correct the difference of the response due to source geometry and gamma ray energy. We expect that this work makes almost all Japanese HDR users enable to use domestic calibration service.

Key words: brachytherapy; reference air kerma rate(RAKR); calibration; radiation quality correction factor

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