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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

Applicability study on existing dosimetry systems to high-power Bremsstrahlung irradiation

Mehta, K.*; Kojima, Takuji; Sunaga, Hiromi

Radiation Physics and Chemistry, 68(6), p.959 - 962, 2003/12

 Times Cited Count:3 Percentile:26.72(Chemistry, Physical)

Applicability of the existing dosimetry systems to high-power Bremsstrahlung irradiation was investigated through a dose intercomparison study, where several dosimeters were irradiated in the dose range 4-12 kGy in identical polyethylene phantoms in a Bremsstrahlung beam obtained from a 5-MeV electron accelerator. Included in the study were alanine dosimeters molded by three different binders, three types of liquid dosimeters:ceric-cerous, dichromate and ethanol-chlorobenzen (ECB), and glutamine powder. The dosimeter responses for Bremsstrahlung radiation were analyzed at the issuing laboratories, and the dose values determined using calibration based on cobalt-60 $$gamma$$-ray irradiation. Dose values for all the three dose levels for all dosimetry systems were in good agreement of better than 3%. The results of the study demonstrate that these existing dosimetry systems have a potential for application to high-power Bremsstrahlung irradiation.

Journal Articles

3-45MeV/u ion beam dosimetry using thin film dosimeters

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki*; Hanaya, Hiroaki; Tachibana, Hiroyuki*

Radiation Physics and Chemistry, 68(6), p.975 - 980, 2003/12

 Times Cited Count:2 Percentile:19.75(Chemistry, Physical)

Four kinds of film dosimeters well-characterized for low LET radiations were applied to 3-45 MeV/u ions. The dose responses relative to those for low LET radiations are almost one up to about 10 MeV/(mg/cm$$^{2}$$) and gradually become smaller with increase of the stopping power. Overall uncertainty in ion beam dosimetry using these characterized dosimeters is better than $$pm$$5%(1$$sigma$$) including uncertainty in fluence measurement($$pm$$2%). Lateral and depth dose profile measurements were achievable using characterized Gafchromic dosimeters with the spatial resolution of better than 1 and 10 $$mu$$m, respectively.

Journal Articles

Association of Am with humic substances isolated from river waters with different water quality

Nagao, Seiya*; Fujitake, Nobuhide*; Kodama, Hideki*; Matsunaga, Takeshi; Yamazawa, Hiromi

Journal of Radioanalytical and Nuclear Chemistry, 255(3), p.459 - 464, 2003/03

 Times Cited Count:7 Percentile:47.54(Chemistry, Analytical)

no abstracts in English

Journal Articles

Dosimetry for a few hundred keV electron beams

Kojima, Takuji; Hakoda, Teruyuki; Sunaga, Hiromi; Takizawa, Haruki; Hanaya, Hiroaki

Proceedings of 9th International Conference on Radiation Curing (RadTech Asia '03) (CD-ROM), 4 Pages, 2003/00

Dosimetry study for 300 keV electron beams was performed using Gafchromic film dosimeters having 8-$$mu$$m thick radiation-sensitive layer for dose rate measurement, a prototype total-absorption aluminum calorimeter for energy fluence measurement and semi-empirical calculation using EDMULT code for depth-dose distribution estimation. The three preliminary results are compared concerning to dose rate distribution and energy fluence as a function of depth in air. Influences in dosimetry for 300 keV electrons are discussed based on these results.

JAEA Reports

Gas evolution of polyethylene by radiolysis and the application to dosimeter

Haruyama, Yasuyuki; Sunaga, Hiromi; Arakawa, Kazuo; Seguchi, Tadao

JAERI-Tech 2002-084, 105 Pages, 2002/11

JAERI-Tech-2002-084.pdf:2.01MB

no abstracts in English

Journal Articles

Dosimetry for 3-45 MeV/u ion beams using thin film dosimeters

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Hanaya, Hiroaki; Tachibana, Hiroyuki*

JAERI-Review 2002-035, TIARA Annual Report 2001, p.123 - 124, 2002/11

Thin film dosimeters of about 10-200 mm in thickness, which were well -characterized for $$^{60}$$Co $$gamma$$-rays or 2-MeV electrons, have been applied to dosimetry for ion beams. For development of dosimetry covering the dose range of 0.005 to 200 kGy with high precision within $$pm$$5%, the linear energy transfer (LET) characteristics of thin films were studied involving development of precise fluence measurement. Dose mapping technique was also developed achieving high spatial resolution values of about 1$$mu$$m and $$<$$10$$mu$$m for lateral and depth directions respectively. The outline of the recent development is summarized in this paper.

Journal Articles

Present status of food irradiation in the world; A Report of 18th Annual Meeting of ICGFI

Sunaga, Hiromi

Shokuhin Shosha, 37(1-2), p.49 - 52, 2002/10

no abstracts in English

Journal Articles

Flue gas treatment

Sunaga, Hiromi

Denki Gakkai Gijutsu Hokoku, (895), p.61 - 62, 2002/09

no abstracts in English

Journal Articles

Report of 18th Annual Meeting of the International Consultative Group on Food Irradiation (ICGFI)

Sunaga, Hiromi

Genshiryoku Sangyo Shimbun, 2121, P. 2, 2002/01

no abstracts in English

Journal Articles

Application of thin film dosimeters to measurement of ion beam dose distribution, 2

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Hanaya, Hiroaki; Tachibana, Hiroyuki

JAERI-Review 2001-039, TIARA Annual Report 2000, p.120 - 121, 2001/11

Gafchromic film (MD-1260) characterized for MeV/u ion beams was tested for measurement of the lateral distribution profiles in the plastic phantom. Gafchromic film was irradiated to 120 Gy using 450 MeV $$^{129}$$Xe$$^{23+}$$ ions through the 10$$mu$$ thick mesh mask having 6 $$mu$$m line-width and 19$$mu$$ inner latice distance to make artificial dose distribution on the film. Analysis of radiation-induced color change of the film was tried using a microscopic spectrophotpmeter having 1 $$mu$$ dia. analyzing light. The film has a potencial to know exact lateral irradiation area with sufficient sharpness and dose distribution by converting absorbance to dose on he basis of dose response characteristics, with spatial resolution of 1$$mu$$.

Journal Articles

Characterization and evaluation studies on some JAERI dosimetry systems

Kojima, Takuji; Sunaga, Hiromi; Tachibana, Hiroyuki; Takizawa, Haruki; Tanaka, Ryuichi

IAEA-TECDOC-156, p.91 - 98, 2000/06

no abstracts in English

Journal Articles

Application of thin film dosimeters for 3-45MeV/amu ion beams

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki

JAERI-Conf 2000-001, p.310 - 313, 2000/03

no abstracts in English

Journal Articles

Dosimetry systems for characteristics study of thin film dosimeters, 4; Fluence measurement and LET characteristics study of film dosimeters

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki

JAERI-Review 99-025, TIARA Annual Report 1998, p.100 - 102, 1999/10

no abstracts in English

JAEA Reports

Investigation of food irradiation technology for application to plant quarantine; Working group report of food irradiation technology

Sunaga, Hiromi; *; *; Takizawa, Haruki; Yotsumoto, Keiichi; *; Tanaka, Ryuichi; *

JAERI-Tech 99-046, 63 Pages, 1999/06

JAERI-Tech-99-046.pdf:3.7MB

no abstracts in English

Journal Articles

Dosimetry systems for 5-20MeV/amu heavy charged particle beams

Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki

IAEA-TECDOC-1070, p.197 - 202, 1999/03

no abstracts in English

Journal Articles

The Irradiation facilities for the radiation tolerance testing of semiconductor devices for space use in Japan

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Kamiya, Tomihiro; Tanaka, Ryuichi; Hirao, Toshio; Nashiyama, Isamu; et al.

Proceedings of 1999 IEEE Nuclear and Space Radiation Effects Conference, p.117 - 122, 1999/00

no abstracts in English

Journal Articles

Technologies for radiation dosimetry

Sunaga, Hiromi

Tei Enerugi Denshisen Shosha No Oyo Gijutsu, p.36 - 49, 1999/00

no abstracts in English

Journal Articles

Investigation on the positron factory project at JAERI, 11; Progress in technical development of some essential parts for high-power electron linac

Sunaga, Hiromi; Okada, Sohei; Takizawa, Haruki; ; Kawasuso, Atsuo; Yotsumoto, Keiichi

Proceedings of 23rd Linear Accelerator Meeting in Japan, p.313 - 315, 1998/00

no abstracts in English

Journal Articles

The Present status of irradiation facilities at JAERI-Takasaki

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Tanaka, Ryuichi

Proceedings of 3rd International Workshop on Radiation Effects on Semiconductor Devices for Space Application, p.183 - 188, 1998/00

no abstracts in English

66 (Records 1-20 displayed on this page)