著者

加藤 和明

出版者

Atomic Energy Society of Japan

雑誌

日本原子力学会誌 (ISSN:00047120)

巻号頁・発行日

vol.23, no.2, pp.111-115, 1981

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An accidental loss of an RI radiation source, a sealed <SUP>90</SUP>Sr of 1mCi, which occurred at KEK in March, 1980, is reported. Actual dealing with it and lessons learned from it are also stated. In addition, problems in radiation control works at a public research laboratory for universities such as KEK are discussed.

著者

多田 順一郎 加藤 和明 立崎 英夫 林 義弘

出版者

一般社団法人 日本医学物理学会

雑誌

放射線医学物理 (ISSN:09188010)

巻号頁・発行日

vol.13, no.2, pp.127-131, 1993 (Released:2012-09-24)

参考文献数

5

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Proton Medical Research Center of Tsukuba University employs a scattering method to obtain approoriate prooriate (almost flat dose distribution of 16cm in diameter on the treatment table) irradiation field for the proton beam therapy. A simple estimation shows that only 10% of protons impinging into the scatterer can reach the irradiation field. Collimators as well as other devices placed along course of the beam port interrupt the rest of protons. As is well known, energetic protons generate neutrons when they interact with matters. Some portions of these strongly penetrating neutrons cause an unexpected whole body irradiation of patients during the proton therapy. In this report, the neutron dose per unit proton target dose is estimated about 0.006 Sv/Gy for a typical treatment planning (the specific fluence and average energy of protons at the surface of the patient are about 1.1 x 109cm-2/Gy and 135 MeV respectively), and a strategy for reducing them is proposed.

著者

加藤 和明

出版者

公益社団法人日本放射線技術学会

雑誌

日本放射線技術學會雜誌 (ISSN:03694305)

巻号頁・発行日

vol.62, no.8, pp.1073-1076, 2006-08-20

被引用文献数

1 1

著者

村野 剛志 飯沼 武 舘野 之男 大崎 洋充 立石 宇貴秀 寺内 隆司 加藤 和明 井上 登美夫

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.64, no.9, pp.1151-1156, 2008-09-20 (Released:2008-10-08)

参考文献数

15

被引用文献数

2 2 1

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The benefits of 18F-fluorodeoxyglucose (18FDG) positron emission tomography (PET) cancer screening are expected to include a large population of examinees and are intended for a healthy group. Therefore, we attempted to determine the benefit/risk ratio, estimated risk of radiation exposure, and benefit of cancer detection. We used software that embodied the method of the International Commission on Radiological Protection (ICRP) to calculate the average duration of life of radiation exposure. We calculated the lifesaving person years of benefit to be obtained by 18FDG PET cancer screening detection. We also calculated the benefit/risk ratio using life-shortening and lifesaving person years. According to age, the benefit/risk ratio was more than 1 at 35–39 years old for males and 30–34 years old for females. 18FDG PET cancer screening also is effective for examinees older than this. A risk-benefit analysis of 18FDG-PET/computed tomography (CT) cancer screening will be necessary in the future.