Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(8): 585-592 (2019)

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


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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