@article{oai:repo.qst.go.jp:00043397,
 author = {Fukumura, Akifumi and Kanai, Tatsuaki and Kanematsu, Nobuyuki and Yusa, Ken and Maruhashi, Akira and Nohtomi, Akihiro and Nishio, Teiji and Shinbo, Munefumi and Akagi, Takashi and Yanou, Toshihiro and Fukuda, Shigekazu and 福村 明史 and 金井 達明 and 兼松 伸幸 and 遊佐 顕 and 丸橋 晃 and 納冨 昭弘 and 西尾 禎治 and 新保 宗史 and 赤城 卓 and 福田 茂一},
 journal = {Standards and Codes of Practice in Medical Radiation Dosimetry (IAEA Proceedings Series)},
 month = {Dec},
 note = {A new protocol for dosimetry in external beam radiotherapy was published by the
Japan Society of Medical Physics in September 2002.The protocol deals with proton and
heavy ion beams and with electron and photon beams, using the absorbed dose to water
formalism with calculated ND,w factors. An intercomparison programme was carried out
with the new protocol to establish interinstitutional uniformity in proton beam
dosimetry. The absorbed doses were measured with different cylindrical ionization
chambers in a water phantom at a position of 30 mm residual range for a proton beam
that had a range of 155 mm and a spread out Bragg peak 60 mm wide. As a result, the
intercomparison showed that the use of the new protocol would improve the +/-1.0%
(one standard deviation) and 2.7% (maximum discrepancy) differences in absorbed
doses stated by the participating institutions to +/-0.3% and 0.9%, respectively. The new protocol will be adopted by all the participants.},
 pages = {321--326},
 title = {Proton beam dosimetry:Protocol and intercomparison in Japan},
 volume = {2},
 year = {2003}
}