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Journal Articles

Series studies on inter-comparison of radiation calibration fields and calibration techniques between KAERI and JAEA

Yoshitomi, Hiroshi; Tanimura, Yoshihiko*; Tatebe, Yosuke; Tsutsumi, Masahiro; Kawasaki, Katsuya; Kowatari, Munehiko; Yoshizawa, Michio; Shimizu, Shigeru*; Kim, J.-S.*; Lee, J.-G.*; et al.

Proceedings of 4th Asian and Oceanic Congress on Radiation Protection (AOCRP-4) (CD-ROM), 4 Pages, 2015/07

Journal Articles

Evaluation of the characteristics of the neutron reference field using D$$_{2}$$O-moderated $$^{252}$$Cf source

Kowatari, Munehiko; Fujii, Katsutoshi; Takahashi, Masa; Yoshizawa, Michio; Shimizu, Shigeru; Kawasaki, Katsuya; Yamaguchi, Yasuhiro

Radiation Protection Dosimetry, 126(1-4), p.138 - 144, 2007/08

 Times Cited Count:4 Percentile:32.43(Environmental Sciences)

The facility of the Radiation Standards (FRS) of the Japan Atomic Energy Agency was equipped with the reference neutron field by using D$$_{2}$$O moderated $$^{252}$$Cf neutron source (D$$_{2}$$O-Cf), with a 30cm diameter D$$_{2}$$O sphere. In order to determine the characteristics of the reference field within the ranges of calibration distance (75 to 200 cm from the center of the source to the calibration point) in detail, the authors performed the evaluation of the neutron spectra and neutron fluence rate at various distances from the D$$_{2}$$O moderated source assembly by computations using MCNP-4C and by experimental studies using Bonner Multi-sphere neutron Spectrometer (BMS). Due to the volume neutron source, it is difficult to measure the contribution of the scattered neutron component with the desirable accuracy by shadow-cone method. In this study, the net counting rate of each counter of BMS was corrected by estimating the ratio of the counting rate of each counter in condition of the experimental and the ideal arrangement by the Monte Carlo calculation. The spectra of the direct component were unfolded by using the corrected counting rate with SAND II code. The averaged dose conversion coefficients (h$$^{*}$$$$phi$$(10) and h$$_{p}$$$$phi$$(10)) and neutron dose rates (H$$^{*}$$(10) and H$$_{p}$$(10)) at various distance were estimated based on the measured spectra. The effectiveness of the correction was discussed by comparing the measured and calculated values. Additionally, the suitable distance for the calibration of personal dosimeter at FRS reference field was evaluated by the results.

Journal Articles

The Status of 4MV Van-de-Graaff accelerator at facility of radiation standards of JAEA

Fujii, Katsutoshi; Kowatari, Munehiko; Kawasaki, Katsuya

Hoken Butsuri, 41(3), p.175 - 179, 2006/09

no abstracts in English

JAEA Reports

Operation and maintenance manual of the accelerator installed in the facility of radiation standards

Fujii, Katsutoshi; Kawasaki, Katsuya; Kowatari, Munehiko; Tanimura, Yoshihiko; Kajimoto, Yoichi; Shimizu, Shigeru

JAEA-Testing 2006-005, 146 Pages, 2006/08

JAEA-Testing-2006-005.pdf:19.71MB

4MV Van de Graff accelerator was installed in the Facility of Radiation Standards (FRS) in June 2000, and monoenergetic neutron calibration fields and high energy $$gamma$$-ray calibration fields have been developed. The calibration fields are provided for R&D on dosimetry, and for the calibration and type-test of radiation protection instruments. This article describes the operational procedure, the maintenance work and the operation of the related apparatuses of the accelerator. This article focuses on the sufficient safety and radiation control for the operators, the maintenance performance of the accelerator, and on the prevention of the malfunction due to the mistakes of the operator. This article targets the unexperienced engineers in charge of operation and maintenance of the accelerator.

Journal Articles

Centralized radioactivity measurement system for radiation control in Tokai research establishment of JAERI

Kawasaki, Katsuya

Hoken Butsuri, 40(1), p.56 - 60, 2005/03

The centralized radioactivity measurement system has been used to carry out intensively measurements of a large number and variety of samples that are necessary for the control of radioactivity in the facilities of the JAERI Tokai Establishment and its environment. The operation of the system started in 1981, and presently the system processes more than 20,000 samples a year. However, the computers of the system have aged so much that the manufacturer's support and stable operation are no longer sure. Therefore, we renewed and restructured the computer system in 2003. A client-server system was adopted in the new system. The information of samples can be registered through the intranet. The clients can also confirm the progress of processing of their samples and browse the analytical results from their own computers. The renewed system can provide some convenience functions to the clients. This report is introduced about the centralized radioactivity measurement system.

JAEA Reports

Renewal of centralized radioactivity measurement system for radiation control

Kawasaki, Katsuya; Mochizuki, Kaoru*; Suzuki, Takehiko; Kinouchi, Nobuyuki

JAERI-Tech 2004-070, 50 Pages, 2004/12

JAERI-Tech-2004-070.pdf:18.19MB

The centralized radioactivity measurement system has been used to carry out intensively measurements of a large number and variety of samples that are necessary for the control of radioactivity in the facilities of the JAERI Tokai Establishment and its environment. The operation of the system started in 1981, and presently the system processes more than 20,000 samples a year. However, the computers of the system have aged so much that the manufacturer's support and stable operation are no longer sure. Therefore, we renewed and restructured the computer system in 2003. A client-server system was adopted in the new system. The information of samples can be registered through the intranet. The clients can also confirm the progress of processing of their samples and browse the analytical results from their own computers. The renewed system can provide some convenience functions to the clients.

Journal Articles

Determination of detection efficiency curves of HPGe detectors on radioactivity measurement of volume samples

Saegusa, Jun; Kawasaki, Katsuya; Mihara, Akira; Ito, Mitsuo; Yoshida, Makoto

Applied Radiation and Isotopes, 61(6), p.1383 - 1390, 2004/12

 Times Cited Count:27 Percentile:84.9(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Measurement of depth distributions of $$^{3}$$H and $$^{14}$$C induced in concrete shielding of an electron accelerator facility

Endo, Akira; Harada, Yasunori; Kawasaki, Katsuya; Kikuchi, Masamitsu

Applied Radiation and Isotopes, 60(6), p.955 - 958, 2004/06

 Times Cited Count:6 Percentile:42.01(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Determination of $$gamma$$-ray efficiency curves for volume samples by the combination of Monte Carlo simulations and point source calibration

Saegusa, Jun; Oishi, Tetsuya; Kawasaki, Katsuya; Yoshizawa, Michio; Yoshida, Makoto; Sawahata, Tadahiro*; Honda, Tetsutaro*

Journal of Nuclear Science and Technology, 37(12), p.1075 - 1081, 2000/12

no abstracts in English

Journal Articles

Evaluation of peak-to-total ratio for germanium detectors

*; Oi, Yoshihiro; Taki, Mitsumasa; Kawasaki, Katsuya; Yoshida, Makoto

Applied Radiation and Isotopes, 50(6), p.1057 - 1061, 1999/00

 Times Cited Count:6 Percentile:46.15(Chemistry, Inorganic & Nuclear)

no abstracts in English

JAEA Reports

Measurement of concentrations of $$gamma$$-ray emitters induced in the concrete shield of the JAERI electron linac facility

Endo, Akira; Kawasaki, Katsuya; Kikuchi, Masamitsu; Harada, Yasunori

JAERI-Tech 97-027, 28 Pages, 1997/07

JAERI-Tech-97-027.pdf:1.03MB

no abstracts in English

Journal Articles

JAEA Reports

Extremely low level waste $$gamma$$-scanner and its characters

; Kawasaki, Katsuya; Minami, Kentaro

JAERI-M 90-069, 46 Pages, 1990/04

JAERI-M-90-069.pdf:1.57MB

no abstracts in English

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

Centralized radioactivity measurement service in JAEA Nuclear Science Research Institute

Ogose, Hitoshi; Kawasaki, Katsuya; Kajimoto, Yoichi

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

Comparison of calibration factors for dosemeters at $$^{241}$$Am-Be neutron standard fields using new and old sources

Kowatari, Munehiko; Tatebe, Yosuke; Sato, Yasuo; Kawasaki, Katsuya; Yoshizawa, Michio

no journal, , 

For the contribution to the effective operation of $$^{241}$$Am-Be neutron standard fields, experimental studies on the comparison of the calibration factors for neutron dosemeters by old and new sources were made. Measured calibration factors for each dosemeter were compared by estimating their E$$_{n}$$ values. Results of the variation of calibration factor for neutron dosemeters were quite satisfactory and identical calibration factors were obtained at neutron calibration fields by new and old $$^{241}$$Am-Be source.

Oral presentation

Inter-comparison on calibration of personal dosemeter in neutron fields between JAEA and KAERI

Tatebe, Yosuke; Kowatari, Munehiko; Tanimura, Yoshihiko; Kawasaki, Katsuya; Yoshizawa, Michio; Im, G. S.*; Kim, S.*; Lee, J.*; Kim, B.-H.*

no journal, , 

no abstracts in English

Oral presentation

Establishment of high energy $$gamma$$-ray calibration field at the FRS of JAEA

Kowatari, Munehiko; Tanimura, Yoshihiko; Tsutsumi, Masahiro; Kawasaki, Katsuya; Yoshizawa, Michio

no journal, , 

A 6-7 MeV high energy $$gamma$$-ray field is to be established as a calibration field for radiation protection instruments at the Facility of Radiation Standards (FRS) of Japan Atomic Energy Agency (JAEA). This calibration field is essential to measure dose rates in accurate due to $$gamma$$-rays which are observed around BWRs. The $$gamma$$-ray field has been produced through the reaction of $$^{19}$$F(p,$$alpha$$$$gamma$$)$$^{16}$$O reaction using the accelerator. For establishing the calibration field, there are some difficulties to overcome which are caused by its $$gamma$$-ray energy. In the presentation, these difficulties will be presented and discussions concerning the establishment of the high energy $$gamma$$-ray calibration field will be made.

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