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
井戸形電離箱を用いた基準空気カーマ率測定では，線源型式の違いによるレスポンス差異の補正が必要となる場合がある。本研究では，2種類の井戸形電離箱を用いて60Co線源及び新型の192Ir線源のレスポンスを補正するための線源補正係数ksourceを算出した。2019年に報告した線源形状補正係数ksgは不確かさを更新し，名称を線源補正係数ksourceとして改めた。この補正係数により，井戸形電離箱校正サービスの対象拡大が期待できる。
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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