JOPSS - Search Results

Journal Articles

Calculation of conversion factor for estimation of $^{131}$ I concentrations in the air from pulse-height distribution observed by NaI(Tl) detector in monitoring posts

Yamada, Junya; Hashimoto, Makoto; Seya, Natsumi; Haba, Risa; Muto, Yasunobu; Shimizu, Takehiko; Takasaki, Koji; Yokoyama, Sumi*; Shimo, Michikuni*

Radioisotopes, 65(10), p.403 - 408, 2016/10

https://doi.org/10.3769/radioisotopes.65.403

The purpose of this study is to develop a quick method for estimation of $^{131}$ I concentrations in the air using data measured by monitoring posts. In this method, $^{131}$ I concentrations were estimated by multiplying $^{131}$ I count rates at the full-energy peak measured with a NaI(Tl) detector by a concentration conversion factor. The concentration conversion factor for monitoring posts in JAEA Oarai Center was calculated with an EGS5 Monte Carlo code. As a result, the concentration conversion factor for an infinite-air-source was 25.7 Bq/m $^{3}$ /cps.

Journal Articles

Cost estimation method for decommissioning of nuclear facilities

Tomii, Hiroyuki; Matsuo, Kiyoshi*; Shiraishi, Kunio; Watabe, Kozo; Saiki, Hideo*; Kawatsuma, Shinji*; Rindo, Hiroshi*; Zaitsu, Tomohisa*

Dekomisshoningu Giho, (31), p.11 - 20, 2005/03

http://www.randec.or.jp/publish/documents/gihou/Decommissioning%20gihou_31.pdf

no abstracts in English

Journal Articles

Evaluation of energy responses for neutron dose-equivalent meters made in Japan

Saegusa, Jun; Yoshizawa, Michio; Tanimura, Yoshihiko; Yoshida, Makoto; Yamano, Toshiya*; Nakaoka, Hiroshi*

Nuclear Instruments and Methods in Physics Research A, 516(1), p.193 - 202, 2004/01

https://doi.org/10.1016/j.nima.2003.07.045

Times Cited Count：16 Percentile：69.88(Instruments & Instrumentation)

Energy responses of three types of Japanese rem counters were evaluated by Monte Carlo simulations and measurements. The energy responses for thermal neutrons, monoenergetic neutrons with energies up to 15.2 MeV were evaluated as well as for neutrons from such radionuclide sources as $^{252}$ Cf. The calculated results were corroborated with the measured ones. Angular dependence of the response and dose equivalent response was also evaluated. As a result, the reliable energy responses were obtained by careful simulations of the proportional counter, moderator and absorber of the rem counters. Furthermore, discussions were made about the relationship between pressure of counting gas and sensitivity of the rem counter. By using the obtained responses, relations of predicted readings of the rem counters and true dose equivalent were studied for various workplace spectra.

JAEA Reports

Dose conversion coefficients for high-energy photons, electrons, neutrons and protons

Sakamoto, Yukio; Sato, Osamu*; Tsuda, Shuichi; Yoshizawa, Nobuaki*; Iwai, Satoshi*; Tanaka, Shunichi; Yamaguchi, Yasuhiro

JAERI 1345, 103 Pages, 2003/01

JAERI-1345.pdf:4.95MB

no abstracts in English

Journal Articles

Current status of neutron calibration field of JAERI/FRS

Yoshizawa, Michio

Hokeikyo Nyusu, (29), p.2 - 5, 2002/05

http://www.irm.or.jp/news29.pdf

no abstracts in English

Journal Articles

Evaluation of neutron dosemeter responses to various neutron fields

Saegusa, Jun; Yoshizawa, Michio; Tanimura, Yoshihiko; Yoshida, Makoto

Radioisotopes, 51(1), p.26 - 33, 2002/01

https://doi.org/10.3769/radioisotopes.51.26

no abstracts in English

JAEA Reports

Biosphere modeling with climate changes for safety assessment of high-level radioactive waste geological isolation

Kato, Tomoko; ; Suzuki, Yuji*; ; Ishiguro, Katsuhiko; Ikeda, Takao*; Richard, L.*

JNC TN8400 2001-003, 128 Pages, 2001/03

JNC-TN8400-2001-003.pdf:6.09MB

In the safety assessment of a high-level radioactive waste (HLW) disposal system, it is required to estimate radiological impacts on future human beings arising from potential radionuclide releases from a deep repository into the surface environment. In order to estimate the impacts, a biosphere model is developed by reasonably assuming radionuclide migration processes in the surface environment and relevant human lifestyles. Releases from the repository might not occur for many thousands of years after disposal. Over such timescales, it is anticipated that the considerable climatic change, for example, induced by the next glaciation period expected to occur in around ten thousand years from now, will have a significant influence on the near surface environment and associated human lifestyles. In case of taking these evolution effects into account in modeling, it is reasonable to develop several alternative models on biosphere evolution systems consistent with possible future conditions affected by expected climatic changes. In this study, alternative biosphere models were developed taking effects of possible climatie change into account. In the modeling, different climatic states existing in the world from the present climate condition in Japan are utilized as an analogy. Estimation of net effects of the climatic change on biosphere system was made by comparing these alternative biosphere models with a constant biosphere model consistent with the present climatic state through flux to dose conversion factors derived from each one.

Journal Articles