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Oshima, Masumi*; Goto, Jun*; Hayakawa, Takehito*; Asai, Masato; Kin, Tadahiro*; Shinohara, Hirofumi*
Isotope News, (790), p.19 - 23, 2023/12
When analyzing samples that contain many radionuclides at various concentrations, such as radioactive waste or fuel debris, it is difficult to apply general spectrum analysis methods and is necessary to chemically separate each nuclide before quantifying it. The chemical separation is especially essential for analysis using a liquid scintillation counter (LSC). In this report, the authors explain the newly developed spectral determination method (SDM) in which the entire spectrum is fitted to quantify radioactivity of nuclides mixed in a sample. By applying the SDM to - and X-ray spectrum measured by LSC and -ray spectrum measured by Ge detector simultaneously, the authors demonstrated that radioactivity of 40 radionuclides mixed in a sample at concentrations varying by two orders could be quantified, which is useful to simplify chemical separation process in radionuclide quantification.
Haba, Hiromitsu*; Fan, F.*; Kaji, Daiya*; Kasamatsu, Yoshitaka*; Kikunaga, Hidetoshi*; Komori, Yukiko*; Kondo, Narumi*; Kudo, Hisaaki*; Morimoto, Koji*; Morita, Kosuke*; et al.
Physical Review C, 102(2), p.024625_1 - 024625_12, 2020/08
Times Cited Count:6 Percentile:59.56(Physics, Nuclear)Shinohara, Ayaka*; Hanaoka, Hirofumi*; Sakashita, Tetsuya*; Sato, Tatsuhiko; Yamaguchi, Aiko*; Ishioka, Noriko*; Tsushima, Yoshito*
Annals of Nuclear Medicine, 32(2), p.114 - 122, 2018/02
Times Cited Count:8 Percentile:44.01(Radiology, Nuclear Medicine & Medical Imaging)Radionuclide therapy with low-energy auger electron emitters could potentially provide high anti-tumor efficacy while keeping normal organs toxicity low. In this study, we evaluated the usefulness of auger electron emitter I and compared it with beta-emitter I for tumor treatment in 2D and 3D cell culture models. The computer simulation model for 2D and 3D cell culture were constructed, and the absorbed radiation dose of I or I in each model were calculated by using a Monte Carlo simulation code (PHITS). The therapeutic effect of I was comparable to that of I in 2D model, but the efficacy was inferior to that of I-MIBG in 3D model, since crossfire effect is negligible and the homogeneous distribution of radionuclide was insufficient.
Hayakawa, Takehito; Shizuma, Toshiyuki; Chiba, Satoshi; Kajino, Toshitaka*; Hatsukawa, Yuichi; Iwamoto, Nobuyuki; Shinohara, Nobuo; Harada, Hideo
Astrophysical Journal, 707(2), p.859 - 865, 2009/12
Times Cited Count:6 Percentile:20.43(Astronomy & Astrophysics)no abstracts in English
Hamamoto, Shimpei; Iigaki, Kazuhiko; Shimizu, Atsushi; Sawahata, Hiroaki; Kondo, Makoto; Oyama, Sunao; Kawano, Shuichi; Kobayashi, Shoichi; Kawamoto, Taiki; Suzuki, Hisashi; et al.
JAEA-Technology 2006-030, 58 Pages, 2006/03
During normal operation of High Temperature engineering Test Reactor (HTTR) in Japan Atomic Energy Agency (JAEA), the reactivity is controlled by the Control Rods (CRs) system which consists of 32 CRs (16 pairs) and 16 Control Rod Drive Mechanisms (CRDMs). The CR system is located in stand-pipes accompanied by the Reserved Shutdown System (RSS). In the unlikely event that the CRs fail to be inserted, the RSS is provided to insert BC/C pellets into the core. The RSS shall be designed so that the reactor should be held subcriticality from any operation condition by dropping in the pellets. The RSS consists of BC/C pellets, hoppers which contain the pellets, electric plug, driving mechanisms, guide tubes and so on. In accidents when the CRs cannot be inserted, an electric plug is pulled out by a motor and the absorber pellets fall into the core by gravity. A trouble, malfunction of one RSS out of sixteen, occurred during a series of the pre-start up checks of HTTR on February 21, 2005. We investigated the cause of the RSS trouble and took countermeasures to prevent the issue. As the result of investigation, the cause of the trouble was attributed to the following reason: In the motor inside, The Oil of grease of the multiplying gear flowed down from a gap of the oil seal which has been deformed and was mixed with abrasion powder of brake disk. Therefore the adhesive mixture prevented a motor from rotating.
Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Chiba, Satoshi; Shinohara, Nobuo; Nakagawa, Tsuneo; Arima, Taiko*
Astrophysical Journal, 628(1, Part1), p.533 - 540, 2005/07
Times Cited Count:22 Percentile:51.52(Astronomy & Astrophysics)no abstracts in English
Hatsukawa, Yuichi; Toh, Yosuke; Oshima, Masumi; Hayakawa, Takehito; Shinohara, Nobuo; Kushita, Kohei; Ueno, Takashi; Toyoda, Kazuhiro*
Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.111 - 113, 2003/01
Times Cited Count:12 Percentile:62.23(Chemistry, Analytical)no abstracts in English
Hayakawa, Takehito; Toh, Yosuke; Oshima, Masumi; Matsuda, Makoto; Hatsukawa, Yuichi; Shinohara, Nobuo; Iimura, Hideki; Shizuma, Toshiyuki; Zhang, Y.*; Sugawara, Masahiko*; et al.
Physics Letters B, 551(1-2), p.79 - 85, 2003/01
Times Cited Count:10 Percentile:55.62(Astronomy & Astrophysics)no abstracts in English
Toh, Yosuke; Hatsukawa, Yuichi; Oshima, Masumi; Shinohara, Nobuo; Hayakawa, Takehito; Kushita, Kohei; Ueno, Takashi
Health Physics, 83(1), p.110 - 113, 2002/07
Times Cited Count:10 Percentile:54.86(Environmental Sciences)no abstracts in English
Oshima, Masumi; Toh, Yosuke; Hatsukawa, Yuichi; Hayakawa, Takehito; Shinohara, Nobuo
Journal of Nuclear Science and Technology, 39(4), p.292 - 294, 2002/04
Times Cited Count:18 Percentile:73.21(Nuclear Science & Technology)no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Nuclear Instruments and Methods in Physics Research A, 482(1-2), p.328 - 333, 2002/04
Times Cited Count:25 Percentile:81.52(Instruments & Instrumentation)no abstracts in English
Toh, Yosuke; Oshima, Masumi; Hatsukawa, Yuichi; Hayakawa, Takehito; Shinohara, Nobuo
Journal of Radioanalytical and Nuclear Chemistry, 250(2), p.373 - 376, 2001/11
Times Cited Count:17 Percentile:74.85(Chemistry, Analytical)no abstracts in English
Oshima, Masumi; Hatsukawa, Yuichi; Toh, Yosuke; Hayakawa, Takehito; Shinohara, Nobuo
Kagaku To Kyoiku, 49(9), p.552 - 553, 2001/09
no abstracts in English
Toh, Yosuke; Czosnyka, T.*; Oshima, Masumi; Hayakawa, Takehito; Kusakari, Hideshige*; Sugawara, Masahiko*; Osa, Akihiko; Koizumi, Mitsuo; Hatsukawa, Yuichi; Katakura, Junichi; et al.
Journal of Physics G; Nuclear and Particle Physics, 27(7), p.1475 - 1480, 2001/07
Times Cited Count:35 Percentile:84.98(Physics, Nuclear)no abstracts in English
Hatsukawa, Yuichi; Toh, Yosuke; Oshima, Masumi; Hayakawa, Takehito; Shinohara, Nobuo; Kushita, Kohei; Ueno, Takashi
KEK Proceedings 2001-14, p.193 - 194, 2001/06
no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Journal of Radioanalytical and Nuclear Chemistry, 248(1), p.121 - 124, 2001/04
Times Cited Count:6 Percentile:44.09(Chemistry, Analytical)no abstracts in English
Oshima, Masumi; Toh, Yosuke; Hayakawa, Takehito; Hatsukawa, Yuichi; Shinohara, Nobuo
JAERI-Conf 2001-002, p.532 - 534, 2001/03
no abstracts in English
Toh, Yosuke; Czosnyka, T.*; Oshima, Masumi; Hayakawa, Takehito; Kusakari, Hideshige*; Sugawara, Masahiko*; Hatsukawa, Yuichi; Katakura, Junichi; Shinohara, Nobuo; Matsuda, Makoto
European Physical Journal A, 9(3), p.353 - 356, 2000/11
Times Cited Count:53 Percentile:90(Physics, Nuclear)no abstracts in English
Hayakawa, Takehito; Oshima, Masumi; Hatsukawa, Yuichi; Katakura, Junichi; Iimura, Hideki; Matsuda, Makoto; Shinohara, Nobuo; Toh, Yosuke; Mitarai, Shiro*; Shizuma, Toshiyuki; et al.
European Physical Journal A, 9(2), p.153 - 156, 2000/10
Times Cited Count:17 Percentile:66.14(Physics, Nuclear)no abstracts in English
Zhang, Y. H.*; Hayakawa, Takehito; Oshima, Masumi; Toh, Yosuke; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; Shinohara, Nobuo; Ishii, Tetsuro; Kusakari, Hideshige*; et al.
European Physical Journal A, 8(4), p.439 - 442, 2000/09
Times Cited Count:14 Percentile:60.74(Physics, Nuclear)no abstracts in English