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Journal Articles

Determination of the anisotropic emission factor for neutrons from $$^{241}$$Am-Be source

Kowatari, Munehiko; Onuma, Isamu; Tanimura, Yoshihiko; Kawasaki, Katsuya; Saegusa, Jun; Yoshizawa, Michio

Radioisotopes, 57(9), p.559 - 569, 2008/09

https://doi.org/10.3769/radioisotopes.57.559

The neutron standard field using $$^{241}$$Am-Be neutron source has been widely used for the routine calibration of neutron dosemeters. The neutron fluence rate at the calibration point is one of the most essential parameters. For the precise determination of the neutron fluence rate, the effect defined as an anisotropic emission from the neutron source, F$$_{I}$$($$theta$$), should be taken into account. For the proper calibration of the neutron dosemeters used in the Japan Atomic Energy Agency (JAEA), the anisotropic factor F$$_{I}$$(90) from an $$^{241}$$Am-Be neutron source was experimentally determined using the precision long counter. Before the determination of the anisotropic factor of the $$^{241}$$Am-Be source with the protection case, the measured angular distribution from the X3 type $$^{241}$$Am-Be source was compared with the result obtained by other researchers and with the Monte Carlo calculation using MCNP-4C, for the verification of the method the authors adopted.

Oral presentation

Use and maintenance of tritium target attached on the 4MV van de graff accelerator

Onuma, Isamu; Kawasaki, Katsuya; Kowatari, Munehiko; Yasu, Katsuji; Okura, Takehisa; Kajimoto, Yoichi; Shimizu, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Study on the reduction of anisotropic emission from $$^{241}$$Am-Be neutron source

Kowatari, Munehiko; Onuma, Isamu; Kawasaki, Katsuya; Tanimura, Yoshihiko; Saegusa, Jun; Yoshizawa, Michio

no journal, , 

no abstracts in English

Oral presentation

Improvement of the management for sealed radioisotopes by the source administration system

Tatebe, Yosuke; Onuma, Isamu; Kawasaki, Katsuya; Kowatari, Munehiko; Sawahata, Tadahiro; Sato, Yasuo; Yoshizawa, Michio

no journal, , 

no abstracts in English

Oral presentation

Radiation control associated with decommissioning of reprocessing test facility

Onuma, Isamu; Kanamori, Kenji; Sekijima, Mitsuaki; Kobayashi, Makoto; Akiyama, Isamu; Shimizu, Isamu

no journal, , 

no abstracts in English

Oral presentation

Use and the effect of surface contamination survey meter simulation program

Onuma, Isamu; Kobayashi, Makoto; Umehara, Takashi; Shimizu, Isamu

no journal, , 

no abstracts in English

Oral presentation

The Radiation control for the decontamination and recovery of high concentration radioactive residue in the waste storage tank

Arakawa, Yuto; Fujii, Katsutoshi; Mimura, Ryuji; Nakashio, Nobuyuki; Onuma, Isamu; Shishido, Nobuhito; Umehara, Takashi

no journal, , 

no abstracts in English

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