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Aoki, Katsunori; Ogura, Hideki; Ogata, Nobuhisa; Ikeda, Koki; Nagasaki, Yasushi; Tsurudome, Koji; Furuta, Sadaaki*
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Manabe, Kentaro; Takahashi, Fumiaki; Sato, Kaoru
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Japan Atomic Energy Agency is developing a program using the latest models and data for estimation of internal dose compliant with the 2007 Recommendations of the International Commission on Radiological Protection (ICRP). Nuclear decay data, specific absorbed fraction data for adult males and females, and radiation weighting factors and tissue weighting factors have been published as the models and data compatible with the 2007 Recommendations. The program equips all the latest models and data, and can evaluate radiation weighted S coefficients. A test calculation was executed using the program for evaluation of S coefficients for self-absorption in the thyroid of adult males corresponding to the 2007 and 1990 Recommendations. The coefficient based on the 2007 and 1990 Recommendations was 1.3 
10
Sv/decay and 1.6 10 Sv/decay, respectively, and the coefficient decreased 18%. This is because correction of the mass of organs considering their blood content was executed for self-absorption cases. We will report the development status of this program, and the results of test calculations and the study.
Kinase, Sakae
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Kuwata, Haruka*; Hagiwara, Hiroki; Yanagisawa, Kayo; Manabe, Sachi*; Takeishi, Minoru; Watanabe, Hitoshi; Uezu, Yasuhiro
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Yoshida, Tadayoshi; Tsuda, Shuichi; Tanigaki, Minoru*; Okumura, Ryo*; Saito, Kimiaki
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Tsuda, Shuichi; Yoshida, Tadayoshi; Tanigaki, Minoru*; Okumura, Ryo*; Saito, Kimiaki
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Environmental dose rate monitoring has been performed using scintillation detectors since the Fukushima Dai-ichi Nuclear Power Plant accident happened. It is necessary to evaluate the influence of directional dependence on indicated values, because scintillation detectors with such dependence are used, though photons come from various direction in the environment. In this study, pulse height spectra were measured using scintillation detectors with different crystal configurations and ambient dose equivalent rates were obtained using spectrum - dose conversion operators. The ratio of dose rates calculated in a simulated environmental radiation field agrees with the measurement fairly well. The calculated dose rates of CsI(Tl) cylindrical crystals with varying height-to-diameter ratios indicated that the environmental dose rates can be estimated by a simple calibration using a unidirectional beam, provided that a crystal configuration and an irradiation surface are properly selected.
Sato, Kaoru; Takahashi, Fumiaki; Koba, Yusuke*; Ono, Koji*; Yoshitake, Takayasu*; Hasegawa, Takayuki*; Katsunuma, Yasushi*; Kasahara, Tetsuji*; Okuda, Yasuo*; Nakada, Yoshihiro*; et al.
no journal, ,
JAEA is now developing CT dose calculator named WAZA-ARIv2 in cooperation with the National Institute of Radiological Sciences. WAZA-ARIv2 has been opened to the public as full-dress uses on January 2015. WAZA-ARIv2 can perform dose assessment against 4 different body physiques by using the organ dose database, which were constructed on the basis of adult Japanese phantoms with 4 body sizes (-2
, average, +2, +5). In this study, it was found that salivary gland doses are independent on BMI, whereas lung doses are dependent on BMI. The differences in the effects of BMI on absorbed doses between salivary glands and lungs might be caused by the difference in thickness of subcutaneous soft tissues between head and thorax.
Shimada, Kazumasa; Kai, Michiaki*
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The latest atomic bomb survivor life span study (LSS) reported that cancer risks due to radiation are increased with smoking synergistically. Therefore, it is important for radiation risk estimation to consider the information of smoking habit. However, current method of radiation risk estimation are not considered with age and sex but considered with smoking habit. Then, this method may overestimate the risk of radiation for non-smokers. For this reason, we estimate cancer risk due to radiation considering smoking cohort effect (information of smoking rate and quitting smoking) and evaluate the effects of smoking information for risk evaluation. In this research, it is important for estimation of non-smoker baseline risk to consider the information of smoking habit for over 50 years old when their cancer risk increase.
(10) to relate dosemeter readings to effective doseTsujimura, Norio
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no abstracts in English
Mikami, Satoshi; Saito, Kimiaki
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Hamada, Nobuyuki*; Sakashita, Tetsuya*; Sato, Tatsuhiko
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We developed an in silico model of cataractogenesis based on the Monte Carlo method. Detailed of the model development together with the comparison with the epidemiological studies on naturally-induced cataract will be presented at the meeting. Preliminary results of the comparison with the epidemiological studies on radiation-induced cataract will be also discussed.
Hoshi, Katsuya; Yoshida, Tadayoshi; Tsujimura, Norio; Okada, Kazuhiko
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Hoshi, Katsuya; Yoshida, Tadayoshi; Tsujimura, Norio; Okada, Kazuhiko
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Honda, Fumiya*; Kinase, Sakae
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-ray 3 mm depth dose equivalent and protection measures with respect to the lens of the eye, 3; Adaptability to field worksTakimoto, Misaki; Okuyama, Shun; Yamazaki, Takumi; Ito, Yasuhisa; Takada, Chie; Tsujimura, Norio; Shiba, Kozo; Okada, Kazuhiko; Namiki, Atsushi
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Matsubara, Natsumi; Nagaoka, Mika; Fujita, Hiroki; Nakano, Masanao
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Okura, Takehisa; Omori, Shuhei; Kawasaki, Masatsugu
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Ambient gamma dose rate has monitored at the several sites around nuclear facilities of Nuclear Science Research Center, JAEA in Tokai, Ibaraki. Effect of the Fukushima accident prevents from monitoring of influence from the nuclear facilities. Chronicle variation of ambient gamma dose rate for 5 years after the Fukushima accident was analyzed statistically by dividing components of the Fukushima accident and extracting environmental factor of it. Variation of the environmental factor was evaluated quantitatively and verified. This result will be basic material to optimize the monitoring of the dose rate by distinguishing influence from nuclear facilities from the effect of the Fukushima accident.
Nagaoka, Mika; Fujita, Hiroki; Kurihara, Osamu*
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He in radioactive gaseous wasteKometani, Tatsunari; Furutani, Misa; Nakagawa, Masahiro; Ueno, Yumi; Sato, Junya
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Kasugai, Yoshimi; Sato, Koichi; Masuyama, Koichi; Seki, Kazunari; Miyamoto, Yukihiro; Kai, Tetsuya; Harada, Masahide; Haga, Katsuhiro; Takada, Hiroshi
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no abstracts in English