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Usami, Hiroshi; Morishita, Yuki; Torii, Tatsuo; Sugita, Takeshi*; Kobayashi, Ikuo*
no journal, ,
no abstracts in English
Saito, Tatsuo
no journal, ,
Our "Task force for the study about the radioprotection of the wastes bearing natural radioactive nuclides" is now discussing problems from wastes occurred with nuclear fuel cycle facilities from the viewpoint of radioprotection. I introduce a summary of the examination problems and our planning symposium.
Sato, Kaoru; Takahashi, Fumiaki; Koba, Yusuke*; Ono, Koji*; Yoshitake, Takayasu*; Hasegawa, Takayuki*; Katsunuma, Yasushi*; Kasahara, Tetsuji*; Okuda, Yasuo*; Nakada, Yoshihiro*; et al.
no journal, ,
WAZA-ARIv2 is developed as the web-based open system for CT dose calculator under joint research of JAEA, NIRS (now, QST) and Oita University of Nursing and Health Sciences. WAZA-ARIv2 can provide organ doses under consideration of the body physiques (BMI = 18, 22, 28, 37) of patients with average height of adult Japanese by using voxel phantoms developed by JAEA. In this study, we analyzed the relationship between variations of organ doses and body indices. It was found that effects of weight variations on organ doses were larger than those of height variations. Generally, thickness of the subcutaneous soft tissues is easily changed by variations of weight rather than those of height. This fact may cause the differences in variations of organ doses between weight and height.
Furuta, Takuya; Sato, Kaoru; Takahashi, Fumiaki
no journal, ,
Voxel-based computational human phantoms have been used for radiation dose assessment with Monte Carlo radiation transport simulation codes. However, development of polygon-based computation humans becomes popular due to advantages on description of thin layer tissues and small organs. International Commission on Radiological Protection (ICRP) also announced to adopt polygon human phantoms as the reference phantoms. We therefore introduced a function to treat tetrahedral-mesh geometry, a type of polygon geometry, into Particle and Heavy Ion Transport code Systems (PHITS). Along this implementation, we also developed an efficient transport algorithm with tetrahedral-mesh geometry, which allows to reduce the computational time to 1/4 of the voxel-mesh calculation using the same precision computational human phantom. We also started a development of new polygon-based human phantoms based on Japanese voxel phantoms. The complete version will be published hopefully next year.
Takimoto, Misaki; Yamazaki, Takumi; Takada, Chie; Okada, Kazuhiko; Endo, Akira; Yoshizawa, Michio; Momose, Takumaro
no journal, ,
no abstracts in English
Hamada, Nobuyuki*; Sakashita, Tetsuya*; Sato, Tatsuhiko
no journal, ,
Cataracts have long been known, but a biologically based mathematical model is still unavailable for cataratogenesis. We here report for the first time an in silico model for cataractogenesis.
Tamura, Ken; Nemoto, Norio; Isozaki, Kohei
no journal, ,
no abstracts in English
-ray spectroscopyYoshitomi, Hiroshi; Tanimura, Yoshihiko; Hoshi, Katsuya; Aoki, Katsunori; Tsujimura, Norio; Yokoyama, Sumi*
no journal, ,
no abstracts in English
Takahata, Eiji; Ito, Yasuhisa; Kawasaki, Takashi; Takada, Chie; Hashimoto, Makoto; Takasaki, Koji; Yoshizawa, Michio; Momose, Takumaro
no journal, ,
no abstracts in English
Tsujimura, Norio; Yoshitomi, Hiroshi; Hoshi, Katsuya; Aoki, Katsunori; Tanimura, Yoshihiko; Nishino, Sho; Yokoyama, Sumi*
no journal, ,
no abstracts in English
Matsuya, Yusuke; Hamada, Nobuyuki*; Date, Hiroyuki*; Sato, Tatsuhiko
no journal, ,
After the accident at Fukushima Daiichi Nuclear Power Plant in 2011, insoluble particulate matters with high radio-activity (i.e., cesium bearing microparticles) were found. However, biological effects after the exposure with the microparticles remains unclear. Long-term attachment of the microparticles makes high dose rate around the microparticles. So, it is necessary to perform biological experiments by using cultured cells. For preliminary examining the biological experiments, by using PHITS for dose calculation and mathematical model for DNA damage kinetics (which was developed in Hokkaido University), we estimated the nuclear dose and DNA damage following the exposure with the cesium bearing microparticles so far. As a result, we obtained a finding that DNA damage induced by the microparticles is detectable. In the future, based on this estimation results, we are planning to investigate the biological effects after the exposure with cesium bearing microparticles.
Hoshi, Katsuya; Tsujimura, Norio; Aoki, Katsunori; Yoshitomi, Hiroshi; Tanimura, Yoshihiko; Yokoyama, Sumi*
no journal, ,
no abstracts in English
Yoshida, Hiroko*; Shinohara, Naohide*; Manabe, Kentaro; Higaki, Shogo*
no journal, ,
no abstracts in English
Yokoyama, Sumi*; Ezaki, Iwao*; Aoki, Katsunori; Tatsuzaki, Hideo*; Hirao, Shigekazu*; Tachiki, Shuichi*; Yoshitomi, Hiroshi; Hoshi, Katsuya; Tanimura, Yoshihiko; Oguchi, Hiroyuki*; et al.
no journal, ,
no abstracts in English
Ezaki, Iwao*; Aoki, Katsunori; Tatsuzaki, Hideo*; Tachiki, Shuichi*; Hirao, Shigekazu*; Yoshitomi, Hiroshi; Hoshi, Katsuya; Tanimura, Yoshihiko; Oguchi, Hiroyuki*; Tsujimura, Norio; et al.
no journal, ,
no abstracts in English
Kinouchi, Nobuyuki; Hashimoto, Makoto; Sakai, Toshiya; Yoshizawa, Michio; Momose, Takumaro
no journal, ,
We report on the situation of the occurrence of contamination at Plutonium Fuel Research Facility of Oarai Research and Development Center.
Takada, Chie; Ishikawa, Keiji; Sukegawa, Kazuhiro; Nomura, Norio; Takasaki, Koji; Sumiya, Shuichi; Yoshizawa, Michio; Momose, Takumaro
no journal, ,
We'll explain lessons and measures on the response to the contamination accident at Plutonium Fuel Research Facility of Oarai Research and Development Center.
Nagaoka, Mika; Fujita, Hiroki; Kurihara, Osamu*
no journal, ,
no abstracts in English
Sakoda, Akihiro
no journal, ,
Attention is usually paid to lung when the evaluation of radon exposure is made. It may also be important to see skin exposure in particular cases such as bathing in radon hot spring, since radon is absorbed via skin and its progeny is deposited onto skin to some degree. The former was previously reported, and the latter was studied in the present work. A numerical model was first made as to the behavior of deposition of radon progeny to skin in water. This model calculation was fitted to existing human data to obtain a parameter, i.e. deposition coefficient. The interference of radon gas in water on this human data was also discussed with the model of skin permeability of radon, which revealed that it is negligible. Furthermore, skin doses were calculated for some deposition coefficients of radon progeny onto skin.