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Cs behaviors in the Ogaki Dam Reservoir during a heavy rainfall eventKurikami, Hiroshi; Kitamura, Akihiro; Yokuda, Satoru*; Onishi, Yasuo*
Journal of Environmental Radioactivity, 137, p.10 - 17, 2014/11
Times Cited Count：32 Percentile：67.34(Environmental Sciences)Tsunematsu, Toshihide; Azumi, Masafumi; Matsumoto, Hiroshi; *; ; Shimomura, Yasuo; Sugihara, Masayoshi; Suzuki, Norio; Takizuka, Tomonori; Tokuda, Shinji
JAERI-M 88-029, 95 Pages, 1988/02
no abstracts in English
Akahane, Keiichi*; Ono, Koji*; Okuda, Yasuo*; Sato, Kaoru; Takahashi, Fumiaki; Ban, Nobuhiko*; Shimada, Yoshiya*; Endo, Akira; Kai, Michiaki*
no journal, ,
The WAZA-ARI is a dose calculator of medical exposures on X-ray CT examinations, which is the web-based program based on the simulation data of voxel phantoms of Japanese adults and a 4-y girl. After the development, the WAZA-ARI has been installed in a web server of National Institute of Radiological Sciences (NIRS), and opened to the public as trial uses on Dec 2012. The user authentication function and the data input pages by users have been adding to the WAZA-ARI to store the calculated data and the inputted data of doses and frequencies of X-ray CT examinations into the database on medical exposure in NIRS for the analyses of the CT exposures. The use of these functions and WAZA-ARI II, which can calculate the doses of different patients' body sizes, will provide the basic and useful data on the CT exposures for the radiation protection in medicine, because the portion of CT doses in the overall medical exposures are relatively high compared to other radiological diagnoses.
Koba, Yusuke*; Matsumoto, Shinnosuke*; Nakada, Yoshihiro*; Kasahara, Tetsuji*; Akahane, Keiichi*; Okuda, Yasuo*; Sato, Kaoru; Takahashi, Fumiaki; Yoshitake, Takayasu*; Hasegawa, Takayuki*; et al.
no journal, ,
Many of the CT devices are in Japan. It is guessed that exposure doses of Japanese derived from CT scans are higher than others. Thus, it is needed to properly manage scan conditions and exposure doses of individual patients. JAEA developed WAZA-ARI under the collaboration research project with the National Institute of Radiological Sciences (NIRS) and the Oita University of Nursing and Health Sciences. Practical use of new version WAZA-ARI named WAZA-ARIv2 began on January 30, 2015 at the web server in NIRS. In WAZA-ARIv2, users can calculate patients doses by using only standard condition (120 kV) of X-tube voltage. In recent years, CT scans at low tube voltage against pediatric patients with high radiosensitivity are increasing. In this study, spectrum of X-ray derived from CT scan at low tube voltage was examined, and was defined in "usrsors.f" file of PHITS. We reported the characteristics of X-ray and organ doses derived from CT scan at low tube voltage (80 kV).
Ono, Koji*; Koba, Yusuke*; Matsumoto, Shinnosuke*; Nakada, Yoshihiro*; Okuda, Yasuo*; Akahane, Keiichi*; Sato, Kaoru; Takahashi, Fumiaki; Yoshitake, Takayasu*; Hasegawa, Takayuki*; et al.
no journal, ,
In medical treatment, CT scan is useful diagnostic method. On the other hand, exposure doses derived from CT scans are dependent on body sizes of patients. Therefore, consideration of body sizes is essential for accurate dose assessment of individual patients. JAEA developed the CT dose calculator, WAZA-ARIv2 under the collaboration research project with the National Institute of Radiological Sciences and the Oita University of Nursing and Health Sciences. WAZA-ARIv2 enable users to accurately calculate exposure doses of patients with sexes, ages (0y, 1y, 5y, 10y, 15y and adult) and fatness (small, large and extra-large body sizes). In the future, we will be plans to add the dose calculation functions corresponding to the scan conditions at low tube voltage and multi-detector row (more 80) CT devices to WAZA-ARIv2. We reported the system and future plans of WAZA-ARIv2 corresponding to dose calculation of patients with various body sizes.
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.
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.
