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Sono, Hiroki; Ono, Akio*; Kojima, Takuji; Takahashi, Fumiaki; Yamane, Yoshihiro*
Journal of Nuclear Science and Technology, 43(3), p.276 - 284, 2006/03
Times Cited Count：1 Percentile：9.69(Nuclear Science & Technology)For a study on the applicability of a personal dosimetry method to criticality accident dosimetry, an assessment of the human body surface and internal dose estimations was performed by experimental and computational simulations. The experimental simulation was carried out in a criticality accident situation at the TRACY facility. The neutron and 
-ray absorbed doses in muscle tissue were separately estimated by a dosimeter set of an alanine dosimeter and a thermoluminescence dosimeter made of enriched lithium tetra borate with a phantom. The computational simulation was conducted with a Monte Carlo code taking account of dose components of neutrons, prompt -rays and delayed -rays. The computational simulation was ascertained to be valid by comparison between the calculated dose distributions in the phantom and the measured ones. The assessment based on the experimental and computational simulations confirmed that the personal dosimetry using the dosimeter set provided a first estimation of the body surface and internal doses with precision.
-ray absorbed doses inside human body in criticality accident situations using phantom and tissue-equivalent dosimetersSono, Hiroki; Kojima, Takuji; Soramasu, Noboru*; Takahashi, Fumiaki
JAERI-Conf 2005-007, p.315 - 320, 2005/08
Personal dosimeters provide a fundamental evaluation of external exposures to human bodies in radiation accidents. The dose distribution inside the body, which is needed to estimate the exposures from a result of personal dosimetry, has been evaluated mostly by computational simulations, while experimental data to verify the simulations are not sufficiently supplied, in particular, in criticality accident situations. For the purpose of obtaining the experimental data on external exposures inside the body, a preliminary experiment on criticality accident dosimetry was carried out at the Transient Experiment Critical Facility (TRACY) using a human phantom and tissue-equivalent dosimeters. The neutron and -ray absorbed doses inside the phantom could be satisfactorily measured by the combined use of an alanine dosimeter and a thermoluminescent dosimeter made of enriched lithium tetra borate. The doses measured in and on the phantom were regarded as reasonable in dose level and distribution by comparison with the doses measured in the free air.
Mehta, K.*; Kojima, Takuji; Sunaga, Hiromi
Radiation Physics and Chemistry, 68(6), p.959 - 962, 2003/12
Times Cited Count：3 Percentile：25.40(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.
Nakamura, Takemi*; Tonoike, Kotaro; Miyoshi, Yoshinori
JAERI-Tech 2003-031, 38 Pages, 2003/03
JAERI-Tech-2003-031.pdf:3.97MB
Institute for Radioprotection and Nuclear Safety (IRSN) and the OECD Nuclear Energy Agency (NEA) jointly organized SILENE Accident Dosimetry Intercomparison Exercise to intercompare the dose measurement systems of participating countries. Each participating country carried out dose measurements in the same irradiation field, and the measurement results were mutually compared. The authors participated in the exercise to measure the doses of gamma rays and neutron from SILENE by using thermoluminescence dosimeters (TLD's) and an alanine dosimeter. In this examination, the authors derived evaluation formulae for obtaining a tissue-absorbed dose from measured value (ambient dose equivalent) of TLD for neutron. We reported the tissue-absorbed dose computed using this evaluation formula to OECD/NEA. TLD's for neutron were irradiated in the TRACY facility to verify the evaluation formulae. The results of TLD's were compared with the calculations of MCNP and measurements with alanine dose meter. We found that the ratio of the dose by the evaluation formula to the measured value by the alanine dosimeter was 0.94 and the formula agreed within 6%. From examination of this TRACY, we can conclude that the value reported to OECD/NEA has equivalent accuracy.
Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki
JAERI-Conf 2000-001, p.310 - 313, 2000/03
no abstracts in English
H.H.Mai*; N.D.Duong*; Kojima, Takuji
IAEA-TECDOC-1070, p.345 - 351, 1999/03
no abstracts in English
L.G.Lanuza*; E.G.Cabalfin*; Kojima, Takuji; Tachibana, Hiroyuki
IAEA-TECDOC-1070, p.337 - 344, 1999/03
no abstracts in English
Kojima, Takuji; Sunaga, Hiromi; Takizawa, Haruki; Tachibana, Hiroyuki
IAEA-TECDOC-1070, p.197 - 202, 1999/03
no abstracts in English
Co -ray dosimetry at JAERI involving a two-way dose intercomparison study with NPL in the dose range 1-50kGyKojima, Takuji; Tachibana, Hiroyuki; ; ; P.H.G.Sharpe*
Radiation Physics and Chemistry, 54(6), p.619 - 626, 1999/00
Times Cited Count：10 Percentile：60.03(Chemistry, Physical)no abstracts in English
Kojima, Takuji; Tachibana, Hiroyuki; Haruyama, Yasuyuki;
Hoshasen Kagaku, (66), p.47 - 49, 1998/00
no abstracts in English
Kojima, Takuji; Kashiwazaki, Shigeru*; Zhang, Y.*
Applied Radiation and Isotopes, 48(7), p.965 - 968, 1997/07
no abstracts in English
Kojima, Takuji; Kashiwazaki, Shigeru*; Zhang, Y.*
Applied Radiation and Isotopes, 48(7), p.965 - 968, 1997/00
Times Cited Count：5 Percentile：42.44(Chemistry, Inorganic & Nuclear)no abstracts in English
Kojima, Takuji; Morishita, Norio; Ito, Hisayoshi; S.Biramontri*
Applied Radiation and Isotopes, 47(4), p.457 - 459, 1996/00
Times Cited Count：4 Percentile：38.99(Chemistry, Inorganic & Nuclear)no abstracts in English
F.Coninckx*; A.Janett*; Kojima, Takuji; S.Onori*; M.Pantaloni*; H.Schoenbacher*; M.Tavlet*; Wieser, A.*
Applied Radiation and Isotopes, 47(11-12), p.1223 - 1229, 1996/00
Times Cited Count：5 Percentile：44.80(Chemistry, Inorganic & Nuclear)no abstracts in English
-ray dose intercomparison in the absorbed dose range, 5-50kGy, using dichromate and alanine dosimetersH.H.Mai*; Ng.D.Duong*; Kojima, Takuji
Applied Radiation and Isotopes, 47(2), p.259 - 261, 1996/00
Times Cited Count：2 Percentile：24.51(Chemistry, Inorganic & Nuclear)no abstracts in English
100Gy) dosimetryKojima, Takuji;
Radioisotopes, 44(9), p.603 - 607, 1995/09
no abstracts in English
Kashiwazaki, Shigeru*; ; ; ; Kojima, Takuji
JAERI-Conf 95-003, 0, p.270 - 274, 1995/03
no abstracts in English
D.Nichiporov*; V.Kostjuchenko*; J.M.Puhl*; D.L.Bensen*; M.F.Desrosiers*; C.E.Dick*; W.L.Mclaughlin*; Kojima, Takuji; B.M.Coursey*; S.Zink*
Applied Radiation and Isotopes, 46(12), p.1355 - 1362, 1995/00
Times Cited Count：31 Percentile：92.24(Chemistry, Inorganic & Nuclear)no abstracts in English
S.R.Nilekani*; G.R.Narayan*; B.Suseela*; R.M.Bhat*; B.L.Gupta*; Kojima, Takuji; Takizawa, Haruki; Sunaga, Hiromi; Tanaka, Ryuichi
Applied Radiation and Isotopes, 46(3), p.205 - 207, 1995/00
Times Cited Count：5 Percentile：57.30(Chemistry, Inorganic & Nuclear)no abstracts in English
Kojima, Takuji; Kashiwazaki, Shigeru*; Tachibana, Hiroyuki; Tanaka, Ryuichi; M.F.Desrosiers*; W.L.Mclaughlin*
Applied Radiation and Isotopes, 46(12), p.1407 - 1411, 1995/00
Times Cited Count：16 Percentile：80.43(Chemistry, Inorganic & Nuclear)no abstracts in English
