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Journal Articles

Assessment of human body surface and internal dose estimations in criticality accidents based on experimental and computational simulations

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:10.64(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 $$gamma$$-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 $$gamma$$-rays and delayed $$gamma$$-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.

Journal Articles

Measurement of neutron and $$gamma$$-ray absorbed doses inside human body in criticality accident situations using phantom and tissue-equivalent dosimeters

Sono, 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 $$gamma$$-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.

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.

JAEA Reports

Analytical evaluation of dose measurement of critical accident at SILENE (Contract research)

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.

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 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

Dose intercomparison studies for standardization of high-dose dosimetry in Vietnam

H.H.Mai*; N.D.Duong*; Kojima, Takuji

IAEA-TECDOC-1070, p.345 - 351, 1999/03

no abstracts in English

Journal Articles

Dose intercomparison study involving Fricke, ethanol chlorobenzene, PMMA and alanine dosimeters

L.G.Lanuza*; E.G.Cabalfin*; Kojima, Takuji; Tachibana, Hiroyuki

IAEA-TECDOC-1070, p.337 - 344, 1999/03

no abstracts in English

Journal Articles

Uncertainty estimation in $$^{60}$$Co $$gamma$$-ray dosimetry at JAERI involving a two-way dose intercomparison study with NPL in the dose range 1-50kGy

Kojima, Takuji; Tachibana, Hiroyuki; ; *; P.H.G.Sharpe*

Radiation Physics and Chemistry, 54(6), p.619 - 626, 1999/00

 Times Cited Count:10 Percentile:62(Chemistry, Physical)

no abstracts in English

Journal Articles

Research and development on alanine dosimetry system

Kojima, Takuji; Tachibana, Hiroyuki; Haruyama, Yasuyuki; *

Hoshasen Kagaku, (66), p.47 - 49, 1998/00

no abstracts in English

Journal Articles

Alanine-polystyrene dosimeters prepared by injection moulding

Kojima, Takuji; Kashiwazaki, Shigeru*; Zhang, Y.*

Applied Radiation and Isotopes, 48(7), p.965 - 968, 1997/07

no abstracts in English

Journal Articles

Alanine-polystyrene dosimeters prepared by injection moulding

Kojima, Takuji; Kashiwazaki, Shigeru*; Zhang, Y.*

Applied Radiation and Isotopes, 48(7), p.965 - 968, 1997/00

 Times Cited Count:5 Percentile:43.99(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Irradiation and ESR analysis temperature dependence of the gamma-ray response of alanine-polystyrene dosimeters

Kojima, Takuji; Morishita, Norio; Ito, Hisayoshi; S.Biramontri*

Applied Radiation and Isotopes, 47(4), p.457 - 459, 1996/00

 Times Cited Count:4 Percentile:40.53(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Responses of alanine dosimeters to irradiations at cryogenic temperatures

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:46.08(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

$$gamma$$-ray dose intercomparison in the absorbed dose range, 5-50kGy, using dichromate and alanine dosimeters

H.H.Mai*; Ng.D.Duong*; Kojima, Takuji

Applied Radiation and Isotopes, 47(2), p.259 - 261, 1996/00

 Times Cited Count:2 Percentile:25.51(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Application of alanine dosimeter to radiotherapy-level(1$$sim$$100Gy) dosimetry

Kojima, Takuji; *

Radioisotopes, 44(9), p.603 - 607, 1995/09

no abstracts in English

Journal Articles

One-touch alanine dosimetry system for radiation processing

Kashiwazaki, Shigeru*; *; *; *; Kojima, Takuji

JAERI-Conf 95-003, 0, p.270 - 274, 1995/03

no abstracts in English

Journal Articles

Dose intercomparison experiment for gamma rays and 3-MeV electrons by mailing dosimetry using free-radical dosimeters

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:58.92(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Orientation effects on ESR analysis of alanine-polymer dosimeters

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:15 Percentile:80.39(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Investigation of applicability of alanine and radiochromic detectors to dosimetry of proton clinical beams

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:93.12(Chemistry, Inorganic & Nuclear)

no abstracts in English

32 (Records 1-20 displayed on this page)