RADIOISOTOPES

Online ISSN: 1884-4111 Print ISSN: 0033-8303
RADIOISOTOPESは日本アイソトープ協会が発行する学術論文誌です
Radioisotopes 68(8): 585-592 (2019)
doi:10.3769/radioisotopes.68.585

特集Special Issues

7.2.6 炭素線治療における放射線防護7.2.6 Radiation Protection in Carbon-ion Radiotherapy

量子科学技術研究開発機構放射線医学総合研究所物理工学部Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology ◇ 263–8555 千葉県千葉市稲毛区穴川4–9–1 ◇ 4–9–1 Anagawa, Inage-ku, Chiba 263–8555, Japan

発行日:2019年8月15日Published: August 15, 2019
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炭素線治療施設の治療運用に係わる放射線防護のために,HIMACを用いて行われた実験的研究について紹介する。これらの研究の結果は,炭素線治療において二次中性子等で生じる照射野外線量は他の放射線治療と同等もしくは低いこと,また,職業被ばく,公衆被ばく,介助者・介護者の医療被ばくは現行の国内規制基準を十分満足しており,炭素線治療施設における防護が既存の規制で対応できていることを実証した。

Experimental researches on radiation protection in carbon ion radiotherapy were performed in the HIMAC treatment rooms. Some of the key results on dose assessments for medical exposure of patients, medical exposure of careers and comforters, and occupational exposure were introduced here. The undesired exposure to normal tissues outside the treatment volume was investigated by measurements with a portable neutron rem-meter and a tissue equivalent proportional counter. These results indicated that the secondary cancer risk after carbon ion radiotherapy are comparable or less than other external radiation therapy modalities. The doses to radiation technologists working in the carbon ion radiotherapy facility and careers and comforters of the patients from radioactive irradiation devices and patients induced by therapeutic carbon beam were estimated based on experimental measurements. These results demonstrated that the carbon ion radiotherapy facility can be safely operated by current Japanese regulations according to the ICRP recommendations. A lot of these results have been cited in the ICRP publication 127: Radiological protection in ion beam radiotherapy. We therefore believe that these researches offered a significant contribution toward the promotion of carbon ion radiotherapy.

Key words: HIMAC (Heavy Ion Medical Accelerator in Chiba); radio-activation; secondary neutron; occupational exposure; public exposure; medical exposure

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This page was last modified on 2019-08-08T09:15:09.000+09:00


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