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Journal Articles

Shielding study at the Fukui Prefectural Hospital Proton Therapy Center

Satoh, Daiki; Maeda, Yoshikazu*; Tameshige, Yuji*; Nakashima, Hiroshi; Shibata, Tokushi*; Endo, Akira; Tsuda, Shuichi; Sasaki, Makoto*; Maekawa, Motokazu*; Shimizu, Yasuhiro*; et al.

Journal of Nuclear Science and Technology, 49(11), p.1097 - 1109, 2012/11

 Times Cited Count:10 Percentile:65.97(Nuclear Science & Technology)

At the Fukui Prefectural Hospital Proton Therapy Center, neutron doses behind concrete shields and at maze have been measured by using radiation monitors, DARWIN, Wendi-2, a rem meter, and solid state nuclear track detectors. The measured data were compared with the estimations by analytical models and Monte Carlo code PHITS. The analytical model with the parameters employed in shielding design of the facility gave considerably larger estimates than the measured data. This means that the facility was designed with an enough safety margin. The calculation results of PHITS were less than those of the analytical model, and were about 3 times larger than the measured data. From the view point of a safety policy with conservative estimation for shielding design, Monte Carlo simulation is a better tool for estimating radiation safety at accelerator-based proton treatment facilities.

Oral presentation

Study of the dose assessment at Proton Therapy Center, Fukui Prefectural Hospital, 2; Measurement of the neutron dose

Satoh, Daiki; Nakashima, Hiroshi; Shibata, Tokushi; Endo, Akira; Tsuda, Shuichi; Tameshige, Yuji*; Maeda, Yoshikazu*; Sasaki, Makoto*; Maekawa, Motokazu*; Shimizu, Yasuhiro*; et al.

no journal, , 

In order to investigate the optimal design of a proton radiotherapy facility, neutron doses behind shielding walls were measured at the proton therapy center in Fukui prefectural hospital. The radiation monitors, DARWIN, WENDI-2, and REM, were used to assess the neutron doses. The doses obtained by DARWIN and WENDI-2 agreed well. It was found that the REM monitor underestimate the doses due to the lack of sensitivity to neutrons whose energy is above several tens of MeV.

Oral presentation

Study of the dose assessment at proton therapy center, fukui prefectural hospital, 1; Evaluation of the shielding capability

Tameshige, Yuji*; Maeda, Yoshikazu*; Sasaki, Makoto*; Maekawa, Motokazu*; Shimizu, Yasuhiro*; Satoh, Daiki; Nakashima, Hiroshi; Endo, Akira; Shibata, Tokushi; Tsuda, Shuichi; et al.

no journal, , 

no abstracts in English

Oral presentation

Behavior of radiocesium in river systems in Fukushima

Nakanishi, Takahiro; Sato, Seiji; Murai, Taihei; Katayose, Yuji

no journal, , 

A large amount of radiocesium emitted from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident was deposited in terrestrial areas. It is therefore important to determine the quantity of radiocesium transported from these areas by hydrological processes to predict the future contamination status and propose effective countermeasures to reduce exposure. In this paper, we report the aging of the radiocesium concentration in 8 rivers nearby FDNPP and discuss the environmental factors on behavior of radiocesium.

Oral presentation

Trend of $$^{137}$$Cs concentration in river water following the Fukushima nuclear accident in FY 2015-2017

Nakanishi, Takahiro; Katayose, Yuji*; Osotsuka, Koji*; Haginoya, Takumi*; Matsumoto, Takumi*

no journal, , 

A large amount of radiocesium emitted from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident was deposited in terrestrial areas. It is therefore important to determine the quantity of radiocesium transported from these areas by hydrological processes to predict the future contamination status and propose effective countermeasures to reduce exposure. In this paper, we report the trend of the radiocesium concentration in 2 rivers nearby FDNPP and discuss the environmental factors on behavior of radiocesium.

Oral presentation

Concentrations and emission source estimation of unreported harmful elements in combined sewer water during the dry and wet periods in Kooriyama, Fukushima

Ozaki, Hirokazu*; Yoshimura, Kazuya; Katayose, Yuji*; Matsumoto, Takumi*; Asaoka, Yoshihiro*; Hayashi, Seiji*

no journal, , 

no abstracts in English

Oral presentation

Concentrations of heavy metals in combined sewer water drained from urban area in Koriyama, Fukushima

Ozaki, Hirokazu*; Hayashi, Seiji*; Yoshimura, Kazuya; Katayose, Yuji*; Matsumoto, Takumi*; Asaoka, Yoshihiro*

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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