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Katsumura, Soichiro; Kitabata, Takuya; Irie, Tsutomu; Suzuki, Mitsutoshi; Hashimoto, Yu; Kato, Keiji*
Transactions of the American Nuclear Society, 99(1), P. 780, 2008/11
Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Shigyo, Nobuhiro*; Yasuda, Hiroshi*; Takada, Masashi*; Yajima, Kazuaki*; Nakamura, Takashi
Transactions of the American Nuclear Society, 99(1), P. 589, 2008/11
A dose monitoring system applicable to various radiations with wide energy ranges, DARWIN, has been developed for measuring dose rates in workspaces and surrounding environments of accelerator facilities. DARWIN satisfies the following features: (1) capable of monitoring doses from neutrons, photons and muons over wide energy ranges, from thermal energy to 1 GeV, 150 keV to 100 MeV, and 1 MeV to 100 GeV, respectively, (2) high sensitivity and precision, more than 10 times as sensitive as conventional moderator-based survey instruments for neutrons, (3) easy to operate with a simple user-interface, and (4) light weighted for movability. The commercial version of DARWIN is expected to be available in near future.
Sato, Tatsuhiko; Sihver, L.*; Gustafsson, K.*; Mancusi, D.*; Niita, Koji*
Transactions of the American Nuclear Society, 99(1), P. 592, 2008/11
Accurate particle and heavy ion transport codes are required for estimating the radiation risk for personnel and electronic equipment on spacecrafts, as well as estimating the effects of different shielding materials. We are therefore developing and benchmarking a general purpose Monte Carlo code PHITS, which can deal with the transports of all kinds of hadrons and heavy ions with energies up to 200 GeV/n.
DeHart, M. D.*; Gauld, I. C.*; Suyama, Kenya
Transactions of the American Nuclear Society, 99(1), p.663 - 666, 2008/11
It is becoming possible to use three dimension depletion calculation codes owing to the high speed computers in recent years and development of the sophisticated calculation method. In the past, evaluation of the depletion calculation codes has been carried out by the analysis of the isotopic composition data obtained by the Post Irradiation Examination from the positions which are suitable for one or two dimensional calculation method. For the analyses of isotopic composition data from the end region of fuel rods, we need other information of surrounding regions. This paper describes this problem based on the three dimensional depletion calculation.
- coincidence detectionHatsukawa, Yuichi; Oshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Koizumi, Mitsuo; Furutaka, Kazuyoshi; Segawa, Mariko
Transactions of the American Nuclear Society, 99(1), P. 53, 2008/11
The - coincidence detection method for nuclide quantification has been developed by M. Oshima et al. In the case of neutron activation analysis, normally weak rays emitted from trace elements were strongly interfered by intense rays from major elements e.g., 
Na, 
Mn. Therefore, in order to detect rays from trace elements, prior to ray measurements, chemical purification processes are sometimes required to eliminate the major elements. Iridium concentrations in several standard rock samples and geological samples were also measured by this method. Fifty to one hundred mg of each sample were sealed in quartz tube and irradiated together with iridium standard. After irradiation, the - coincidence of multiple rays from the 
Ir was measured with the Ge detectors array, GEMINI-II. rays from about 10 ppt of iridium in geological samples can be detected by this method.