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Journal Articles

Calculation of spatial distribution of dose rate for air under 300keV electron beam irradiation using a Monte Carlo code (EGS4-SPG code)

Hakoda, Teruyuki; Hanaya, Hiroaki; Kaneko, Hirohisa; Miyashita, Atsumi; Kojima, Takuji

Radioisotopes, 54(6), p.161 - 168, 2005/06

no abstracts in English

Journal Articles

Absorbed dose rate distribution in 300 keV electron beam irradiation field for waste-gas purification

Hakoda, Teruyuki; Sunaga, Hiromi; Takizawa, Haruki; Hirota, Koichi; Kojima, Takuji

Radioisotopes, 53(2), p.59 - 69, 2004/02

no abstracts in English

Journal Articles

Conversion from tooth enamel dose to organ doses for ESR dosimetry

Takahashi, Fumiaki; Yamaguchi, Yasuhiro

Radiation Risk Assessment Workshop Proceedings, p.71 - 78, 2003/00

Conversion from tooth enamel dose to organ doses against external photon exposure were studied in order to develop a method that can retrospectively estimate organ doses by the Electron Spin Resonance (ESR) dosimetry using tooth samples. Monte Carlo calculations using EGS4 code were performed to obtain dose to tooth enamel and organ doses by using a modified MIRD-type phantom. The Electron Spin Resonance (ESR) dosimetry using tooth samples and dose measurements using thermo-luminescence dosimeters (TLDs) were also carried out to examine dose to teeth region with a realistic physical phantom. A Voxel-type phantom was constructed from CT images of the physical phantom. Monte Carlo calculations with the Voxel-type phantom were performed to verify the results of the experiments and enamel doses calculated by use of the modified MIRD-type phantom. The obtained data are to be useful for the retrospective assessment of individual dose in past exposure events by the ESR dosimetry with tooth enamel.

Journal Articles

Conversion from tooth enamel dose to organ doses for the electron spin resonance dosimetry

Takahashi, Fumiaki; Yamaguchi, Yasuhiro; Iwasaki, Midori*; Miyazawa, Chuzo*; Hamada, Tatsuji*; Saito, Kimiaki

Journal of Nuclear Science and Technology, 39(9), p.964 - 971, 2002/09

 Times Cited Count:6 Percentile:58.07(Nuclear Science & Technology)

Conversion from tooth enamel dose to organ doses was analyzed to establish a method of retrospective individual dose assessment against external photon exposure by the Electron Spin Resonance (ESR) dosimetry. Dose to tooth enamel was obtained by Monte Carlo calculations using a modified MIRD-type phantom. The calculated tooth enamel doses were verified by measurements with thermo-luminescence dosimeters inserted in a physical head phantom. Energy and angular dependences of tooth enamel dose were compared with those of other organ doses. Additional Monte Carlo calculations were performed to study the effects of human model on the tooth enamel dose with a voxel-type phantom, which was based on CT images of the physical phantom. The data derived with the modified MIRD-type phantom were applied to convert from tooth enamel dose to organ doses against external photon exposure in a hypothesized field, where scattered radiations were taken into account. The results indicated that energy distribution of photons incident to a human body should be required to evaluate precisely individual dose by the ESR dosimetry using teeth.

Journal Articles

Analysis of absorbed dose to tooth enamel for ESR dosimetry

Takahashi, Fumiaki; Yamaguchi, Yasuhiro; Saito, Kimiaki; Iwasaki, Midori*; Miyazawa, Chuzo*; Hamada, Tatsuji*; Funabiki, Jun*

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1314 - 1317, 2002/08

An analysis of dose to tooth enamel was carried out to develop a method that can predict the organdose and effective dose by the Electron Spin Resonance (ESR) dosimetry using teeth for external photon exposure. Absorbed dose to tooth enamel were obtained with Monte Carlo calculations using EGS4 code with a mathematical human model, which has a newly defined teeth-part. Experiments were also carried out to investigate the dose at the tooth area with a physical head phantom. The calculated doses to tooth enamel were, however, less than the measured doses with the TLDs for the case of photon incidence from the back of a human body. Then, a computational human model, called a “Voxel (Volume-pixel) type" phantom was constructed based upon a computed topography (CT) image of the physical head phantom used in the experiments.The additional Monte Carlo calculations were performed to verify the results in the experiments with the EGS4 in conjunction with user's code UCPIXEL and the Voxel type phantom.

Journal Articles

Relations between tooth enamel dose and organ doses for the Electron Spin Resonance dosimetry against external photon exposure

Takahashi, Fumiaki; Yamaguchi, Yasuhiro; Iwasaki, Midori*; Miyazawa, Chuzo*; Hamada, Tatsuji*

Radiation Protection Dosimetry, 95(2), p.101 - 108, 2001/09

 Times Cited Count:26 Percentile:13.12(Environmental Sciences)

An analysis of doses to tooth enamel and to organs was carried out to develop a method that can predict the organ doses and the effective dose by the Electron Spin Resonance (ESR) dosimetry using tooth samples for external photon exposure. Absorbed dose to tooth enamel and organ doses were obtained by Monte Carlo calculations using EGS4 code in combination with a mathematical human model with a newly defined teeth-part. The calculations gave quantitative relations between tooth enamel dose and organ doses for some cases of external photon exposure. It was also found that tooth enamel dose depends more significantly on energy of incident photons than the other organ dose or the effective dose. The obtained data are to be useful for the assessment of individual dose in past exposure events by the ESR dosimetry with tooth enamel.

Journal Articles

Development of precise ion beam dosimetry

Kojima, Takuji

Hoshasen Kagaku, 2001(72), p.37 - 40, 2001/08

no abstracts in English

Journal Articles

Present status of dosimetry for radiation application

Kojima, Takuji

Hoshasen To Sangyo, (89), p.4 - 7, 2001/01

This paper describes the present status of dosimetry as one of the useful technique for the process/quality control in radiation application and radiation research/testing. It introduces (a)activities in dose standardization of International Organization for Standardization(ISO) and International Atomic Energy Agency(IAEA) on publication of standards and organization of workshops, (b)recent efforts for consistency check in dose evaluation of electrons having energies above 4MeV, and (c)development status of dosimeter systems relevant to new requirements in dosimetry. It also comments on importance of planning for succession of high-dose dosimetry technology and education/training of dosimetry workers/researchers.

Journal Articles

Dosimetry for the ion beams irradiation in biology

Kobayashi, Yasuhiko

Hoshasen To Sangyo, (89), p.30 - 35, 2001/01

no abstracts in English

Journal Articles

Analysis of dose in teeth for estimation of effective dose by the electron spin resonance (ESR) dosimetry using dental enamels

Takahashi, Fumiaki; Yamaguchi, Yasuhiro; Saito, Kimiaki; Iwasaki, Midori*; Miyazawa, Chuzo*; Hamada, Tatsuji*

KEK Proceedings 2000-20, p.48 - 55, 2000/12

no abstracts in English

Journal Articles

Dosimetry and instrumentation(P-3, T-3, T-5, T-13)

Murakami, Hiroyuki; Yoshida, Makoto; Noguchi, Hiroshi; Tsuda, Shuichi; Yoshizawa, Michio

Hoken Butsuri, 35(3), p.286 - 289, 2000/09

no abstracts in English

JAEA Reports

None

; Shinohara, Kunihiko; Momose, Takumaro

PNC-TN8510 98-001, 13 Pages, 1998/07

PNC-TN8510-98-001.pdf:0.63MB

None

Journal Articles

Total absorption calorimeter for medium-energy electron beam calibration

Sunaga, Hiromi; Tanaka, Ryuichi; N.M.Ali*; Yotsumoto, Keiichi

Radiation Physics and Chemistry, 46(4-6), p.1283 - 1286, 1995/00

 Times Cited Count:4 Percentile:54.93(Chemistry, Physical)

no abstracts in English

Journal Articles

Present status of dosimetry standardization for radiation processing

Tanaka, Ryuichi

Hoshasen To Sangyo, (59), p.14 - 19, 1993/09

no abstracts in English

Journal Articles

Standardization of dosimetry of radiation processing level

Tanaka, Ryuichi; Takehisa, Masaaki*

Hoshasen Kagaku, (56), p.9 - 19, 1993/00

no abstracts in English

Journal Articles

Study on dosimetry of bremsstrahlung radiation processing

Sunaga, Hiromi; Tachibana, Hiroyuki; Tanaka, Ryuichi; Okamoto, Jiro; *; *

Radiation Physics and Chemistry, 42(4-6), p.749 - 752, 1993/00

 Times Cited Count:3 Percentile:60.79

no abstracts in English

Journal Articles

Recent progress in JAERI alanine/ESR dosimeter system

Kojima, Takuji; Tachibana, Hiroyuki; Haruyama, Yasuyuki; Tanaka, Ryuichi; Okamoto, Jiro

Radiation Physics and Chemistry, 42(4-6), p.813 - 816, 1993/00

 Times Cited Count:7 Percentile:38.22(Chemistry, Physical)

no abstracts in English

Journal Articles

Progress of X-ray irradiation technology and dosimetry for industrial processing

Sunaga, Hiromi

Radioisotopes, 41(3), p.75 - 76, 1992/00

no abstracts in English

Journal Articles

Dosimetry for industrial radiation processing

Tanaka, Ryuichi

Radioisotopes, 40(12), P. 85, 1991/12

no abstracts in English

Journal Articles

Report of Second International Symposium on High-Dose Dosimetry

Kojima, Takuji

Hoshasen Kagaku, (51), p.55 - 56, 1991/00

no abstracts in English

24 (Records 1-20 displayed on this page)