Refine your search:     
Report No.
 - 
Search Results: Records 1-14 displayed on this page of 14
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Evaluation of $$gamma$$-ray spectra measured inside and outside a house in Fukushima

Tanimura, Yoshihiko; Tomita, Jumpei; Yoshitomi, Hiroshi; Yoshizawa, Michio; Hakozaki, Ryozo*; Takahashi, Sohei*

Hoken Butsuri, 51(3), p.141 - 146, 2016/09

Photon spectra were measured inside and outside a house in Minami-Soma city by using a NaI(Tl) scintillation spectrometer. The photons were categorized into three groups according to their energy. The groups were (1) scattered photons, which include low energy photons, (2) direct photons from $$^{134}$$Cs and $$^{137}$$Cs sources and (3) the other photons. Then the ratios of the ambient dose equivalents H$$^*$$(10) of the scattered photons to those of the direct photons from the $$^{134}$$Cs and $$^{137}$$Cs sources have been evaluated from the measured photon spectra. The ratios are high inside the house compared with those out of the house. It was found that the scattered photons contribute to the H$$^*$$(10) by more than 50$$%$$ inside the house. The ambient dose equivalent average energies of the scattered photons are around 0.25 MeV both inside and outside the house. These data is worthwhile to design the optimum shielding for the protection against the public radiation exposure.

JAEA Reports

Radiation environment account before dismantling the conversion facilities; Evaluation of the uranium inventory and air dose rate in the dismantling facilities, 2

Takahashi, Nobuo; Yokoyama, Kaoru; Morimoto, Yasuyuki; Shimaike, Masamitsu; Ikegami, Sohei; Sugitsue, Noritake

JAEA-Technology 2010-003, 92 Pages, 2010/06

JAEA-Technology-2010-003.pdf:10.76MB

At the reprocessed uranium conversion facilities, Hydration and Conversion room-1,2,3, Dehydration and Conversion room-1,2, Dry process filter room have been dismantled according to the schedule, in 2009 fiscal year. The $$gamma$$-ray measurement had been carried out before dismantlement to evaluate the radioactivity inventory. As a result, the uranium recovery work was forecasted for reasonable dismantlement. In addition, the feature nuclide affecting the results of the measurement on the air dose was evaluated. Additionally, as the waste data, $$gamma$$-ray analysis results are shown.

JAEA Reports

Radiation environment account before dismantling the conversion facilities; Evaluation of the uranium inventory and air dose rate in the dismantling facilities

Shimaike, Masamitsu; Yokoyama, Kaoru; Ikegami, Sohei; Takahashi, Nobuo; Sugitsue, Noritake

JAEA-Technology 2009-020, 55 Pages, 2009/06

JAEA-Technology-2009-020.pdf:2.0MB

At the conversion facility, 48Y homogenization treatment equipment (cylinder processing room), UO$$_{3}$$ pneumatic dispatch equipment (fluoride precipitation process room), gas trapping and filling equipment (cold trap room and UF$$_{6}$$ filling room) and the second grade UF$$_{4}$$ drying equipment (UF$$_{4}$$ feed chamber and UF$$_{4}$$ treatment room) are scheduled to be dismantled, in 2008 fiscal year. The $$gamma$$-ray measurement intended for the equipment was done before dismantlement and the radioactivity inventory was evaluated. As a result, the part that the uranium recovery had to be executed was forecast for reasonable dismantlement. Additionally, the reprocessed uranium was used at the conversion facility, so the feature nuclide affecting the air dose was evaluated. In addition, $$gamma$$-ray analysis results are organized for using as the waste data and the radionuclide distribution data in the process.

JAEA Reports

Influence evaluation of spent bed material in the conversion facilities; Evaluation of the external exposure caused by removing the spent bed material in the conversion facilities

Takahashi, Nobuo; Yokoyama, Kaoru; Ikegami, Sohei; Shimaike, Masamitsu; Sugitsue, Noritake

JAEA-Technology 2009-002, 51 Pages, 2009/03

JAEA-Technology-2009-002.pdf:5.71MB
JAEA-Technology-2009-002(errata).pdf:0.24MB

At the conversion facility, dismantlement and removal of the equipment are executed according to the decommissioning plan. The radioactivity of the spent bed material discharged along with the reprocessed uranium conversion is high. So, there is concern that the external exposure caused by the dismantlement of the spent bed material storage is high. Therefore, the uranium isotopic analysis using the $$gamma$$-ray measurement intended for the spent bed material was done, and the external exposure at site boundary was evaluated. As a result, the external exposure at site boundary is low. The external exposure caused by dismantlement work was evaluated, and the points to remember for dismantlement of the spent bed material storage are considered.

Journal Articles

Study of residual defects in ion-implanted and subsequently annealed 3C-SiC

Oshima, Takeshi; Ito, Hisayoshi; Uedono, Akira*; Suzuki, Ryoichi*; Ishida, Yuki*; Takahashi, Tetsuo*; Yoshikawa, Masahito; Kojima, Kazutoshi; Odaira, Toshiyuki*; Nashiyama, Isamu; et al.

Denshi Gijutsu Sogo Kenkyujo Iho, 62(10-11), p.469 - 476, 1999/00

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 2; Evaluation of the nuclide composition in the spent bed material and the external exposure

Takahashi, Nobuo; Shimaike, Masamitsu; Morimoto, Yasuyuki; Ikegami, Sohei; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 3; Evaluation of the nuclide composition in the cold trap and the external exposure

Shimaike, Masamitsu; Takahashi, Nobuo; Morimoto, Yasuyuki; Ikegami, Sohei; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning Project of Uranium Conversion Plant, 4; The Secondary waste features of dismantling

Takahashi, Nobuo; Morimoto, Yasuyuki; Ikegami, Sohei; Tanaka, Yoshio; Tokuyasu, Takashi; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 3; Comparison between estimation and track record concerning wastes volume

Tokuyasu, Takashi; Tanaka, Yoshio; Morimoto, Yasuyuki; Ikegami, Sohei; Takahashi, Nobuo; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 1; Decommissioning progress

Ikegami, Sohei; Tanaka, Yoshio; Tokuyasu, Takashi; Takahashi, Nobuo; Sugitsue, Noritake; Morimoto, Yasuyuki

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 3; Analysis concerning quantity consumed tracking of materials used for dismantlement

Takahashi, Nobuo; Morimoto, Yasuyuki; Ikegami, Sohei; Tanaka, Yoshio; Tokuyasu, Takashi; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 1; Decommissioning result, The First half of 2009

Morimoto, Yasuyuki; Ikegami, Sohei; Tanaka, Yoshio; Tokuyasu, Takashi; Takahashi, Nobuo; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Decommissioning project of uranium conversion plant, 2; Analysis concerning approximation process of weight of dismantlement object

Tanaka, Yoshio; Morimoto, Yasuyuki; Ikegami, Sohei; Tokuyasu, Takashi; Takahashi, Nobuo; Sugitsue, Noritake

no journal, , 

no abstracts in English

Oral presentation

Evaluation of $$gamma$$-ray spectra in living environment around Fukushima Daiichi Nuclear Power Plant

Tanimura, Yoshihiko; Tomita, Jumpei; Yoshitomi, Hiroshi; Yoshizawa, Michio; Hakozaki, Ryozo*; Takahashi, Sohei*

no journal, , 

A easy-to-use $$gamma$$-ray spectrometry technique have been developed using a hand-held NaI(Tl) spectrometer and the MAXED unfolding code. The $$gamma$$-ray spectra in the living environment were measured inside and outside the house at the Minami-Soma city in the Fukushima prefecture. It was found that the dose contribution of the low energy photons is large inside the house compared with those measured outside the house.

14 (Records 1-14 displayed on this page)
  • 1