Clinical calibration dosimetry in JSMP-01: measurements using Farmer- type cylindrical ion chambers

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  • 標準測定法01によるファーマ型電離箱の校正点吸収線量の評価
  • ヒョウジュン ソクテイホウ 01 ニ ヨル ファーマガタ デンリバコ ノ コウセイテン キュウシュウセンリョウ ノ ヒョウカ

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The Japan Society of Medical Physics (JSMP) Task Group published Standard dosimetry of absorbed dose in external beam radiotherapy (Standard dosimetry 01) as a new high-energy photon and electron dosimetry protocol in 2002. In this study, we present Standard dosimetry 01 as the JSMP-01 protocol for the convenience of users. This protocol is based on using an ion chamber having a 60Co absorbed dose to water calibration coefficient, ND,W, which is calculated from a 60Co exposure calibration coefficient, NC. We present dose comparisons between a reference chamber and various Farmer-type cylindrical chambers with different wall materials. The absorbed dose to water was compared at the calibration depths of 5 cm for a 60Co beam,10 cm for photons, and dc= 0.6R50-0.1 (cm) for electrons according to JSMP-01. The JARP chamber in the Kyushu Regional Center which meets third-order standards in Japan was used as the reference chamber. The absorbed dose to water for the Farmer-type chambers determined according to JSMP-01 agreed with that for the JARP chamber within 1% for photon and electron beams. The doses obtained by JSMP-01 and the Japan Association of Radiological Physics protocol (JARP-86) were also compared for photon and electron beams. For the Farmer-type chambers with photon beams, JSMP-01 results were up to 1.5% higher than JARP-86 results. For electron beams JSMP-01results were higher than JARP-86 results by 1.3 2.8%.

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