Faculty of Radiological Technology

加藤 秀起

カトウ ヒデキ  (Hideki Kato)

基本情報

所属
藤田保健衛生大学 医療科学部 放射線学科
学位
博士(工学)(名古屋工業大学)

J-GLOBAL ID
200901087760235837
researchmap会員ID
6000008298

外部リンク

論文

 13

MISC

 66
  • 加藤秀起
    日本放射線技術学会雑誌 70(10) 1181-1187 2014年  招待有り
  • 平岡 武, 加藤秀起, 石川剛弘, 酢屋徳啓, 河合直士, 今関 等
    放射線医学総合研究所技術報告書 6 6-12 2012年  
  • 平岡 武, 加藤 秀起
    放射線科学 54(1) 38-41 2011年1月  
  • 鈴木友輔, 青山貴洋, 高橋礼紀, 加藤秀起, 福間宙志, 磯山茂, 川野誠
    日本放射線技術学会雑誌 66(6) 599-608 2010年  
    In medical linear accelerators, radioactivation is induced on the target and neighborhood parts by photoneutrons accompanying a photo-nuclear reaction and leading to higher acceleration energy. We measured the residual radiation from the radioactivated materials according to the time, and tried to identify radioactivated nuclides and their relative quantities by means of measurement results. It was presumed that the main source of residual radiations was the Target, Flattening filter and Primary collimator in the linac head. Among those materials (copper, tungsten), we calculated decrement curves of residual radiations from radioactivated nuclides generated with photo-nuclear reaction or thermal neutron capture reaction by various ratios, and we investigated the ratio that best fit the measured data. Consequently, it was presumed that 66Cu generated with thermal neutron capture reaction contributed the most to residual radiation, followed by 62Cu generated with photo-nuclear reaction contributed. It is important to understand various characteristics of these nuclides and to undertake management of the device.
  • 福間宙志, 江口佑太, 磯山茂, 川野誠, 鈴木友輔, 青山貴洋, 加藤秀起
    日本放射線技術学会雑誌 66(5) 495-501 2010年  
    The characteristics of activation after high-energy X-rays have been generated by medical linear accelerators were measured using an ionization chamber. Radiation doses increased with rising X-ray energy, based on 10 MV, 15 MV, and 18 MVX-ray measurements. When the total irradiation dose was changed, radiation dose increased with total irradiation dose. When the collimator opened, the radiation dose at a position 15 cm from the isocenter reached about the maximum, which was 2.2 times the dose at the isocenter. The radiation dose became about 0.3 times its level at a position 40 cm from the isocenter, in the outer irradiation field. The dose distribution in the treatment room became almost the same dose extending from the isocenter to 200 cm. Radiation dose decreased gradually while moving away from the target on the treatment beam axis. But it increased again as it approached the floor face. The occupational exposure dose, which was presumed from measurements of the radiation dose 50 cm from the isocenter, was about 0.9 mSv during a year, assuming 600 MU for 1 person, 8 people a day, and 245 days a year. Radiation dose changed with X-ray energy in the machine used, and it was a geometrical constituent in the treatment room. It is important to understand the characteristics of radiation generated by medical linear accelerators.

教育方法・教育実践に関する発表、講演等

 1
  • 件名
    自作ソフトウェアによる放射線基礎科学の学習支援(第2回藤田保健衛生大学医療科学部相互研修FD)
    終了年月日
    2009/08
    概要
    放射線医療は、放射線と人体との相互作用による物理現象を利用したものである。放射線の多種多様な物理現象を理解するためには、膨大な物理データ、その取扱い方法の習得が必要となる。放射線学科学生の学習支援を目的に、放射線に関する種々の物理データおよびその取扱い、それらを用いた放射線基礎科学に関するコンピュータソフトウェアを作成した。その概要について報告した。