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Suwaki, Takuro*; Zaima, Naoki; Nakashima, Shinichi; Nakatsuka, Yoshiaki; Fujiki, Naoki*; Kureta, Masatoshi; Ozu, Akira
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Japan Atomic Energy(JAEA) configurated the non-destructive assay (NDA) systems, which applied to the bulk state nuclear inventory and actual uranium bearing waste drums generated from Ningyo-Toge uranium plants. The methodology of newly active neutron assay systems (JAWAS-N) is based on the fast neutron direct interrogation (FNDI) method developed by NSEC. The systems are composed of neutron generator and He-3 proportional counters with concrete structures functioned as reflector or shielding. FNDI method is defined as followings. Neutron generator produces pulses of 14 MeV neutrons that are directed into drum to induce U-235 fissions in matrix. Secondary fission neutrons generated from U-235 with fast or epithermal neutron energy will be detected by He-3 proportional counters with the diffusion decay time on the order of hundreds micro-second. Neutron detectors which are designed to detect only fast and epithermal neutrons, will be extracted fission neutrons by mathematical analysis methods and be determined U-235 mass. The Systems will be contributed to the field of material accountancy in Ningyo-Toge uranium plants. The systems' verifications through the mockup tests and trials for actual waste drams measurement will be reported.
Mo/
Tc production by activation methodTsuchiya, Kunihiko; Nishikata, Kaori; Kimura, Akihiro; Ishida, Takuya; Takeuchi, Nobuhiro*; Kobayashi, Masaaki*; Kawamura, Hiroshi
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no abstracts in English
Inoue, Kazumi; Fujita, Hiroki; Hatsukawa, Yuichi
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Kato, Takuya; Torii, Yosuke; Futagawa, Kazuo; Yamasoto, Kotaro
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Iimoto, Takeshi*; Kakefu, Tomohisa*; Takagi, Rieko*; Takahashi, Itaru*; Nakamura, Takashi*; Kito, Keiko*; Watanabe, Yoko; Yamashita, Kiyonobu
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no abstracts in English
Fukaya, Yuki; Entani, Shiro; Sakai, Seiji; Mochizuki, Izumi*; Wada, Ken*; Hyodo, Toshio*; Shamoto, Shinichi
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no abstracts in English
ZnSuzui, Nobuo; Weerawardena, T. E.; Yin, Y.-G.; Ishii, Satomi; Kawachi, Naoki; Fujimaki, Shu
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no abstracts in English
Fujimaki, Shu; Maruyama, Teppei*; Suzui, Nobuo; Kawachi, Naoki; Miwa, Eitaro*; Higuchi, Kyoko*
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no abstracts in English
Cu for cancer therapy using accelerator neutronsHashimoto, Kazuyuki; Kawabata, Masako*; Saeki, Hideya*; Sato, Shunichi*; Tsukada, Kazuaki; Watanabe, Satoshi; Nagai, Yasuki
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no abstracts in English
Maekawa, Masaki; Li, H.; Kawasuso, Atsuo
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no abstracts in English
Mo using accelerator neutrons and thermochromatographic separation of TcKawabata, Masako*; Nagai, Yasuki; Hashimoto, Kazuyuki; Hatsukawa, Yuichi; Motoishi, Shoji*; Saeki, Hideya*; Sato, Nozomi*; Ota, Akio*; Shiina, Takayuki*; Kawauchi, Yukimasa*; et al.
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Hirade, Tetsuya
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Positronium (Ps) creates a bubble in liquids because of a negative work function and the ortho-Ps annihilation probability depends on the size of the bubble. The oscillation of the ortho-Ps annihilation probability at very young positron ages, i.e. before 1ns, was successfully observed in room temperature ionic liquids (RTIL). Moreover, the stable annihilation rates at older positron ages in RTIL are much smaller than the annihilation rates of other liquids having similar surface tensions, and the rates do not become smaller at higher temperatures. These phenomena are probably caused by the complicated RTIL structure.
-ray pinhole cameraKawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu
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no abstracts in English
Kawasuso, Atsuo; Maekawa, Masaki; Sakai, Seiji
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Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu
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Ishii, Satomi; Yin, Y.-G.; Hung, N. V. P.*; Suzui, Nobuo; Kawachi, Naoki; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu
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Jiang, L.*; Oshima, Nagayasu*; O'Rourke, B. E.*; Suzuki, Ryoichi*; Harada, Yoshihisa*; Suzuki, Takayuki*; Takatsu, Shuhei*; Hirade, Tetsuya; Takai, Kenichi*
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Positron annihilation spectroscopy (PAS) is a sensitive method for detection of defects such as vacancies, vacancy clusters and nano-voids. The positron probe microanalyzer (PPMA) in AIST can investigate defect distribution of materials using a scanning positron microbeam. For the application of the PPMA for analysis of such materials it is important to consider the defects introduced during the sample preparation. we are investigating two kinds of sample preparation process, electrical discharge machining (EDM) and colloidal silica polishing after EDM. We are studying the depth dependence of the density of the defects induced by these processes in various metals, including SUS316L, using PAS.
Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu
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Chiba, Etsuko*; Iizuka, Tomoko*; Ichikawa, Mariko*; Ukai, Mitsuko*; Kikuchi, Masahiro; Kobayashi, Yasuhiko
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no abstracts in English
-ray irradiated amino acidsNagata, Natsuki*; Komoda, Seiichi*; Kikuchi, Masahiro; Nakamura, Hideo*; Kameya, Hiromi*; Todoriki, Setsuko*; Kobayashi, Yasuhiko; Ukai, Mitsuko*
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no abstracts in English