Tujii Hirohiko, Akagi Takashi, Akahane Keiichi, Uwamino Yoshitomo, Ono Tatsuya, Kanai Tatsuaki, Kohno Ryosuke, Sakae Takeji, Shimizu Masakazu, Urakabe Eriko, Nakayama Takashi, Nakamura Takashi, Nishio Teiji, Noshizawa Kanae, Nishizawa Kunihide, Fukuda Shigekazu, Matsufuji Naruhiro, Yamashita Haruo, Yonai Shunsuke
National Institute of Radiological Sciences (NIRS).
Igaku Butsuri. 2009;28(4):172-206.
Particle radiotherapy using proton and heavy ion beams has shown improved clinical results and is a promising cancer therapy which is expected to gradually spread in Japan. There are, however, no special regulations for radiotherapy treatment facilities. They have been operated under the same safety regulations as for a research facility using a research accelerator. Significantly high-energy radiation is necessary for particle radiotherapy compared with conventional radiation therapy. The treatment facility, therefore, should have a large accelerator, which is installed in a room with a thick shield wall. Data on radiation protection for such high energy medical facilities is fragmentary and insufficient. In this study, we examined the necessity of other regulations for the safe operation of medical facilities for particle radiotherapy. First, we measured activation levels of the therapeutic devices and of patients. Next the safety level of the medical facility was evaluated from the viewpoint of radiation protection. We have confirmed the facilities can be safely operated by present regulations given in the Law Concerning Prevention from Radiation Hazards due to Radiation Isotopes, etc. or the Law for Health Protection and Medical Care.
使用质子和重离子束的粒子放射疗法已显示出更好的临床效果，是一种很有前景的癌症治疗方法，预计将在日本逐渐推广。然而，对于放射治疗设施并没有特殊规定。它们一直按照与使用研究加速器的研究设施相同的安全规定运行。与传统放射治疗相比，粒子放射疗法需要显著更高能量的辐射。因此，治疗设施应配备大型加速器，该加速器安装在有厚屏蔽墙的房间内。关于此类高能医疗设施的辐射防护数据零散且不足。在本研究中，我们探讨了粒子放射治疗医疗设施安全运行的其他规定的必要性。首先，我们测量了治疗设备和患者的活化水平。接下来，从辐射防护的角度评估了医疗设施的安全水平。我们已确认，根据《关于防止因放射性同位素等造成辐射危害的法律》或《健康保护和医疗法》中的现行规定，这些设施可以安全运行。
