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Journal Articles

Accelerator neutron dosimetry using composite-gas-filled proportional counting tube

Usui, Toshihide; Mikami, Satoshi; Hashimoto, Makoto; Nakayama, Naoto; Suzuki, Chihiro*; Tani, Kotaro*; Yamasaki, Keizo*; Misawa, Tsuyoshi*

KURRI Progress Report 2010, P. 209, 2011/10

no abstracts in English

Journal Articles

Time variation of particle size distribution of aerosols generated at accelerator facilities

Yokoyama, Sumi; Yamasaki, Keizo*; Oki, Yuichi*; Osada, Naoyuki*

Hoken Butsuri, 43(4), p.333 - 340, 2008/12

To assess internal exposure due to inhalation of radioactive aerosols and gases generated in high-energy accelerator facilities, physicochemical properties such as particle size of aerosols and chemical form of gases are important information. We measured the particle size distribution and concentration of aerosols coexisting with radionuclide formed by high-energy radiation emission in the target room of LINAC and estimated the long term variation of particle size and concentration of radioactive aerosols in high-energy acceleration facilities.

Journal Articles

Evaluation of aerosol sizing characteristic of an impactor using imaging plate technique

Rahman, N. M.*; Iida, Takao*; Saito, Fumihiro; Koarashi, Jun; Yamasaki, Keizo*; Yamazawa, Hiromi*; Moriizumi, Jun*

Radiation Protection Dosimetry, 123(2), p.171 - 181, 2007/02

 Times Cited Count:11 Percentile:63.76(Environmental Sciences)

no abstracts in English

Journal Articles

Concentrations and their ratios od $$^{222}$$Rn decay products in rainwater measured by $$gamma$$-ray spectrometry using a low-background Ge detector

Takeyasu, Masanori; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*; Ogawa, Yoshihiro*

Journal of Environmental Radioactivity, 88(1), p.74 - 89, 2006/00

 Times Cited Count:22 Percentile:48.42(Environmental Sciences)

The concentrations of $$^{214}$$Pb and $$^{214}$$Bi in rainwater was measured by a low background Ge detector. The concentrations of $$^{214}$$Pb and $$^{214}$$Bi were inverse relations with rainfall rate in some rainfall events, and the concentration ratio of $$^{214}$$Bi to $$^{214}$$Pb would be a weak inverse relation with rainfall rate. The model was considered about the scavenging effects of rainfall to Radon decay products, and those results were discussed with the model.

Journal Articles

Measurements of concentrations and its ratio of radon decay products in rainwater by gamma-ray spectrometry with a low background germanium detector

Takeyasu, Masanori; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*

International Congress Series, 1276, p.289 - 290, 2004/00

The each concentration of $$^{214}$$Pb and $$^{214}$$Bi in rainwater was measured by a low background Ge detector. The concentration of$$^{214}$$Pb was a inverse relation with rainfall rate in some rainfall events, and the concentration ratio of$$^{214}$$Bi to$$^{214}$$Pb was a weak inverse relation with rainfall rate in all rainfall events. These relations were the same as these obtained by the removal model of radon decay products from stratiform cloud.

Journal Articles

Measurements of Concentrations and its Ratio of Radon Decay Products in Rainwater by Gamma-Ray Spectrometry with a Low Background Germanium Detector

Takeyasu, Masanori; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*

Proceedings of 6th International Conference on High Levels of Natural Radiation and Radon Areas, Program & Abstracts, (P-22), 85 Pages, 2004/00

The concentrations and its ratio of Pb-214 and Bi-214 in rainwater were measured by $$gamma$$-ray spectrometry with a low background Ge detector, and the results were compared with the scavenging model of radon decay products from the atmosphere by precipitation. The each concentration of Pb-214 and Bi-214 in rainwater was constant and independent on precipitation rate for some precipitation events, and expressed with a power function of precipitation rate for the other events. The activity ratio of Bi-214 to Pb-214 was observed weak inverse correlated with precipitation rate. The measured ratio agreed fairly well with calculated one by the model.

Oral presentation

Ultra fine particle generation and induced radioactivity in electron linear accelerator

Yamasaki, Keizo*; Oki, Yuichi*; Osada, Naoyuki*; Yokoyama, Sumi; Yamada, Yuji*; Tokonami, Shinji*; Fukutsu, Kumiko*; Iida, Takao*; Rahman, N. M.*; Shimo, Michikuni*

no journal, , 

no abstracts in English

Oral presentation

Formation of radioactive aerosol in electron linear accelerator irradiation room

Osada, Naoyuki*; Oki, Yuichi*; Yamasaki, Keizo*; Yokoyama, Sumi

no journal, , 

no abstracts in English

Oral presentation

Generation of natural and artificial radioactive aerosol in electron linear accelerator

Yamasaki, Keizo*; Oki, Yuichi*; Osada, Naoyuki*; Iida, Takao*; Shimo, Michikuni*; Yamada, Yuji*; Tokonami, Shinji*; Fukutsu, Kumiko*; Yokoyama, Sumi

no journal, , 

The physicochemical properties of radioactive aerosols are important factors to assess internal dose at high energy accelerator facilities. In Kyoto University Research Reactor Institute, a generation of radioactive aerosols in ADSR (Accelerator-Driven Subcritical Reactor) facilities was studied as part of the research project of ADSR. The generation of radioactive aerosols in high intensity irradiation fields of ADSR was simulated by irradiation of the target room air at LINAC. We measured the particle size of radioactive aerosols in the target room during the acceleration period. Natural radon aerosols in the target room grew to the larger size because of an attachment of radon daughters to non-radioactive aerosols. The particle size of the produced radioactive aerosols was also larger with time. This would mean that a formation mechanism of the radioactive aerosols produced at high energy accelerator facilities is the same as radon one.

Oral presentation

Accelerator neutron dosimetry using composite-gas-filled proportional counting tube

Usui, Toshihide; Mikami, Satoshi; Nakayama, Naoto; Hashimoto, Makoto; Suzuki, Chihiro*; Yamasaki, Keizo*; Misawa, Tsuyoshi*

no journal, , 

no abstracts in English

10 (Records 1-10 displayed on this page)
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