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Kinase, Sakae; Murakami, Yuko; Takahashi, Tomoyuki*; Suzuki, Tadakazu*; Sugita, Takeshi*; Ando, Masaki; Mikami, Satoshi; Yamamoto, Hideaki; Saito, Kimiaki
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no abstracts in English
Aoki, Katsunori; Ogura, Hideki; Kubota, Mitsuru; Tsurudome, Koji; Ikeda, Koki; Nagasaki, Yasushi; Ogata, Nobuhisa; Furuta, Sadaaki*
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no abstracts in English
Tsuda, Shuichi; Saito, Kimiaki
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Air dose rate monitoring has been performed since the Fukushima Dai-ichi Nuclear Power Plant accident happened. In the measurement, NaI(Tl) and CsI(Tl) detectors are used, which are usually used in nuclear power plants and calibrated in a uniform irradiation condition in a radiation calibration field. In general, however, the detector responses are dependent on incident direction and in reality, the incident direction of the photons is not uniform in the environment. In this study, the spectrum - dose conversion operator (G(E) function) for h*(10) in a semi-infinite radiation field were obtained using the PHITS code for common scintillation detectors. The results indicate that the detectors obtain the doses within 20% accuracy under the real environment. The results for general scintillation detectors with various crystal configuration and size will be also reported.
Takeishi, Minoru; Shibamichi, Masaru; Murakami, Mitsuhiro; Saegusa, Jun
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no abstracts in English
Shimada, Kazumasa; Kai, Michiaki*
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This paper describes lung cancer mortality risks due to radiation exposure considering the history of smoking in Japanese people. In this study, we calculated the DALY of lung cancer mortality for Japanese males considering the joint effects of radiation and smoking using the generalized multiplicative excess relative risk interaction model (GM model). First, we estimated the lung cancer baseline risk for non-smokers to divide the risk of smoking for mixed population groups that include smokers and non-smokers. Second, we developed a radiation risk model from single to chronic exposure to be able to evaluate the risk of cancer in existing and control exposure situations. Forth, the maximum relative risks of lung cancer mortality for smokers and non-smokers induced by a radiation exposure of 20 mGy/y for Japanese smokers between the age of 20 and 60 years were calculated using the GM model to be 22.2 for men and 15.7 for women, respectively. Therefore, our calculations show that only considering radiation risks strongly underestimate the real risk of lung cancer when the smoking history is not taken into account. Our study indicates that estimations of the health risk due to radiation exposure should consider not only age and gender but also the history of smoking for deriving an occupational exposure limit.
Tomita, Jumpei; Abe, Takuya; Sakaguchi, Aya*; Miyata, Yoshiki*; Nagao, Seiya*; Yamamoto, Masayoshi*
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no abstracts in English
Hirouchi, Jun; Takahara, Shogo; Iijima, Masashi; Watanabe, Masatoshi; Munakata, Masahiro
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no abstracts in English
Kimura, Daisuke; Hikinuma, Yuichi; Tanabe, Masanori; Makino, Tatsuya; Maegawa, Yoshiharu; Hayata, Kenichi*; Shiotani, Junya*; Nohara, Naofumi; Hoshi, Katsuya; Tsujimura, Norio; et al.
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no abstracts in English
Tsujimura, Norio; Takahashi, Fumiaki; Takada, Chie
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no abstracts in English
Hoshi, Katsuya; Yoshida, Tadayoshi; Tsujimura, Norio; Okada, Kazuhiko
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no abstracts in English
Watanabe, Yuki; Nakamura, Keisuke; Akasu, Kohei; Okuyama, Shun; Namiki, Atsushi
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no abstracts in English
Yoshida, Tadayoshi; Tsujimura, Norio; Hoshi, Katsuya
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no abstracts in English
Nakamura, Keisuke; Sugimoto, Tetsuya*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Morishita, Yuki; Takasaki, Koji; Mitsuda, Kazuhisa*
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no abstracts in English
Suga, Takumi; Yamazaki, Takumi; Takada, Chie; Takimoto, Misaki; Okada, Kazuhiko
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Mori, Airi; Ishizaki, Azusa; Imura, Mitsuo*; Munakata, Masahiro
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no abstracts in English
Hokama, Tomonori; Nishimura, Tomohiro; Nakano, Masanao
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It is difficult to judge abnormality using variation of air dose rate after the Fukushima Daiichi Nuclear Power Plant accident. The purpose it setting band of air dose rate after the accident using trend of air dose rate. We divide tendency of dose rate into three Category and estimate band of air dose rate after the accident.
Takahashi, Fumiaki; Ishimori, Yuu; Inagaki, Masayo*; Omori, Yasutaka*; Sanada, Tetsuya*; Sugino, Masato*; Furukawa, Masahide*; Hosoda, Masahiro*; Manabe, Kentaro; Yajima, Kazuaki*; et al.
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The Japan Health Physics Society (JHPS) established a committee on dose assessments of Japanese population in August, 2015. The committee consists of 12 members (researchers and technicians) who are engaged in natural radiation measurements, radiation monitoring, radiation dose assessment and so on. Discussion have been made on dose assessments for daily life exposure in Japan. At the first meeting, stragedy of the committee was discussed and terrestrial radiation, cosmic radiation. Radon and radioactivity in food were defined as the radiological source to be investigated. It was also decided that the committee also would investigate influential factors (e.g., dose assessment model, daily life pattern) on radiation dose assessments. In addition, the committee has a plan to make discussions how JHPS should undertake this issue in future. At the 49th Annual meeting of JHPS, the committee members report their activities and make discussions on radiation dose assessment of Japanese population with the participants to the meeting.
Sato, Tatsuhiko
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We considered the relative biological effectiveness (RBE) of internal exposure of radioactive isotopes emitted by the Fukushima Nuclear Power Plant accident. There is much evidence for suggesting that RBE for the intake of tritium is greater than 1. On the other hand, recent computer simulations suggested that RBE for the intake of Cesium and Iodine should be close to 1. The review of these results will be presented at the meeting, together with some preliminary results of the analysis on the RBE for the intake of microparticles containing Cesium.
Takahashi, Fumiaki
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The Japan Health Physics Society (JHPS) proposes international session under collaboration with scientific societies of this field in Asian countries at the annual meeting. The topics in this year is radiation dose assessment for internal and external exposures from natural and medical radiation sources. Whereas the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCER) has reported exposure of the public from various sources, the contribution of each radiation source to the annual dose can differ among countries due to life pattern. Radiation dose to ingestion becomes higher in Japan, because consume of seafood in which nuclide of uranium series can be accumulated is large. On the contrary, radiation dose from inhalation of Rn gas is lower in Japan due to residential structures. Although m medical exposure dose is assumed to be higher than average over the world in Japan, the dose were derived based upon data before 2000. In this session, the author will report the radiation dose in Japanese populations and issues to be discussed for dose assessments in more detail.
Takeishi, Minoru
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no abstracts in English