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Hakoda, Teruyuki; Sunaga, Hiromi; Takizawa, Haruki; Hirota, Koichi; Kojima, Takuji
Radioisotopes, 53(2), p.59 - 69, 2004/02
no abstracts in English
Mehta, K.*; Kojima, Takuji; Sunaga, Hiromi
Radiation Physics and Chemistry, 68(6), p.959 - 962, 2003/12
Times Cited Count：3 Percentile：25.79(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 
-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.
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(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
) and gradually become smaller with increase of the stopping power. Overall uncertainty in ion beam dosimetry using these characterized dosimeters is better than 
5%(1
) including uncertainty in fluence measurement(2%). Lateral and depth dose profile measurements were achievable using characterized Gafchromic dosimeters with the spatial resolution of better than 1 and 10 
m, respectively.
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：8 Percentile：49.89(Chemistry, Analytical)no abstracts in English
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-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.
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
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 
Co -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 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 1m and 
10m for lateral and depth directions respectively. The outline of the recent development is summarized in this paper.
Sunaga, Hiromi
Shokuhin Shosha, 37(1-2), p.49 - 52, 2002/10
no abstracts in English
Sunaga, Hiromi
Denki Gakkai Gijutsu Hokoku, (895), p.61 - 62, 2002/09
no abstracts in English
Sunaga, Hiromi
Genshiryoku Sangyo Shimbun, 2121, P. 2, 2002/01
no abstracts in English
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 
Xe
ions through the 10 thick mesh mask having 6 m line-width and 19 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 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.
Kojima, Takuji; Sunaga, Hiromi; Tachibana, Hiroyuki; Takizawa, Haruki; Tanaka, Ryuichi
IAEA-TECDOC-156, p.91 - 98, 2000/06
no abstracts in English
Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki
JAERI-Conf 2000-001, p.310 - 313, 2000/03
no abstracts in English
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
Sunaga, Hiromi; *; *; Takizawa, Haruki; Yotsumoto, Keiichi; *; Tanaka, Ryuichi; *
JAERI-Tech 99-046, 63 Pages, 1999/06
no abstracts in English
Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki
IAEA-TECDOC-1070, p.197 - 202, 1999/03
no abstracts in English
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
Sunaga, Hiromi
Tei Enerugi Denshisen Shosha No Oyo Gijutsu, p.36 - 49, 1999/00
no abstracts in English
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
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
