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Journal Articles

Study on the effect of radiation-resistant resin on water radiolysis

Ito, Tatsuya; Nagaishi, Ryuji; Kuwano, Ryo*; Godo, Masao*; Yoshida, Yoichi*

Radiation Physics and Chemistry, 226, p.112198_1 - 112198_5, 2025/01

 Times Cited Count:0 Percentile:0.00(Chemistry, Physical)

In recent years, the use of radiation-resistant resins of polyimide and polyether ether ketone becomes increasing as vessels for irradiation and unsealed radioisotope experiments. However, in our radiolysis experiments, the possibility of interaction between radiolysis products of water and the resin was found, suggesting concerns that the resin may affect reactions in water in radiation fields. To clarify the interaction, dichromate (Cr$$_{2}$$O$$_{7}$$$$^{2-}$$) reduction and hydrogen peroxide (H$$_{2}$$O$$_{2}$$) formation in $$gamma$$-radiolysis of water were compared with and without the resin. The Cr$$_{2}$$O$$_{7}$$$$^{2-}$$ reduction amount in aqueous solution with the resin became larger than that without the resin at the same dose, indicating the promotion of Cr$$_{2}$$O$$_{7}$$$$^{2-}$$ reduction by the resin. On the other hand, the H$$_{2}$$O$$_{2}$$ formation in pure water with and without an electron scavenger were almost independent of the presence of resin. These suggested the interaction between hydroxyl radical and the resin in contact with water in radiation fields.

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:25.19(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

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

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:59.82(Chemistry, Physical)

no abstracts in English

Journal Articles

Effects of temperature during irradiation and spectrophotometry analysis on the dose response of aqueous dichromate dosimeters

H.H.Mai*; Tachibana, Hiroyuki; Kojima, Takuji

Radiation Physics and Chemistry, 53(1), p.85 - 91, 1998/00

 Times Cited Count:5 Percentile:43.70(Chemistry, Physical)

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:24.38(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Removal of fission products and their complexing agents by potassium dichromate method from kerosene degraded with nitric acids

Owada, Ken

Journal of Nuclear Science and Technology, 4(11), p.560 - 564, 1967/00

no abstracts in English

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