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Sato, Tatsuhiko; Yasuda, Hiroshi*; Takada, Masashi*; Nakamura, Takashi*
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no abstracts in English
Am-Be standard neutron sourcesTsujimura, Norio; Yoshida, Tadayoshi
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The authors calculated angular neutron fluence distributions for Am-Be standard sources using the Monte Carlo method. In this calculations, the theoretical "source" neutron spectrum was computed from the kinematics calculation for two-particle reactions using the JENDL alpha,n reaction data file 2005, and was uniformly generated in the doubly-encapsulated stainless steel capsule (X3 and X4 capsules), containing a mixture of americium oxide and beryllium. Spectral changes of alpha particles, varying with a AmO
cluster diameter, were also considered. Calculations were made of the fluence rate at various polar and azimuth angles. As a result, anisotropy correction factors for bare neutron sources were evaluated to be 1.030 and 1.035 for X3 and X4 capsules, respectively.
Shimada, Akihiko; Takubo, Takeshi*; Hakoda, Teruyuki; Iwasaki, Tatsuyuki*; Kinoshita, Shinobu*; Kojima, Takuji
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no abstracts in English
-beta mixed fieldsTakahashi, Masa; Sekiguchi, Masato; Tachibana, Haruo; Hoshi, Shintaro; Yoshizawa, Michio; Kato, Toru*; Yamaguchi, Akihito*
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no abstracts in English
Yoshitomi, Hiroshi; Pangsub, K.; Hoshi, Shintaro; Takahashi, Teruhiko; Shishido, Nobuhito; Onodera, Junichi
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Workers to put full-face mask have checked their protection factors (PFs) by mask-man test apparatus before their works in the Reactor Fuel Examination Facility (RFEF) of JAEA. Analyzing these data, we could fit the distribution of the PFs for the inexperienced workers to the hybrid lognormal distribution. On the other hand, those of the experienced workers could be fitted to the lognormal distribution whose average was about 3000. If the PF is less than 200, then the worker have to check his mask-fit and retry to measure. Taking into account of the result of the retrial, we could also fit them to the lognormal distribution whose average was about 2000 even in those of the inexperienced workers. Next, we tried to correlate PF with BMI (Body Mass Index) to evaluate the individual PFs easily. As a result, we obtained the correlation coefficient is 0.5. In conclusion, we can tentatively say that if the workers have considerable experience using mask-man test apparatus, to put full-face mask can prevent them from inhalation of the radioactive dust about 2000 times more, and moreover we can estimate the individual PFs from their BMIs to some extent.
Agematsu, Takashi; Hanaya, Hiroaki
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no abstracts in English
Kawasuso, Atsuo; Hayashi, Kazuhiko*; Ichimiya, Ayahiko
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no abstracts in English
Maekawa, Masaki; Yu, R.; Kawasuso, Atsuo
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no abstracts in English
Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
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no abstracts in English
- positron annihilation lifetime measurement by use of digital oscilloscopeHirade, Tetsuya; Hashi, Yohei; Yachi, Hironari; Suzuki, Takenori*
no journal, ,
Recently, - positron annihilation lifetime measurement has been possible by use of Ge-68 positron emitter and avalanche photo diodes(APD). APD is placed between Ge-68 source and a sample and detecting positrons injecting into the sample. This information is used as a start signal and the stop signal is obtained by detecting one or both of the annihilation -rays. The detection rate of positrons is about 80% and then it is possible to reduce the random coincidence background. We have succeeded to reduce 40% of the background.
Sawada, Shinichi; Maeno, Takeshi*; Yamaki, Tetsuya; Asano, Masaharu; Terai, Takayuki*; Maekawa, Yasunari
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no abstracts in English
Yamaki, Tetsuya; Kozone, Yuichi; Hiroki, Akihiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
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no abstracts in English
Matsumoto, Kanae; Shimada, Akihiko; Hakoda, Teruyuki; Narita, Tadashi*; Kojima, Takuji
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no abstracts in English
Tominaga, Hiroshi*; Tachikawa, Noboru
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Fujinami, Masanori*; Watanabe, Kazuya*; Oguma, Koichi*; Akahane, Takashi*; Kawasuso, Atsuo; Maekawa, Masaki; Matsukawa, Kazuto*
no journal, ,
no abstracts in English