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Journal Articles

Time-dependence of differential G-values of OH radicals in water under Ne ion radiolysis

Taguchi, Mitsumasa; Kojima, Takuji

JAEA-Review 2005-001, TIARA Annual Report 2004, p.181 - 182, 2006/01

The yields of OH radicals in water containing phenol have been investigated for several ten MeV/n C ion and Ne ion having the same LET value, as a function of the residual ion energy at the specific depth in water. In this study, beside such energy dependence, the dependence of reaction time of OH radical yield was examined by changing the concentration of phenol as solute. The defferential G'-values of OH radicals, those G-values per kinetic energy of ions increase with specific energy of Ne ions. The G'-value just after irradiation(1.5ns) is relatively high but become lower with reaction time to be the value (2.7) obtained for $$^{60}$$Co $$gamma$$-rays. It suggests the diffusion behavior of OH radicals locally induced in water.

Journal Articles

Decomposition of ${it p}$-nonylphenols in water and elimination of their estrogen activities by $$^{60}$$Co $$gamma$$-ray irradiation

Kimura, Atsushi; Taguchi, Mitsumasa; Otani, Yoshimi*; Takigami, Machiko; Shimada, Yoshitaka*; Kojima, Takuji; Hiratsuka, Hiroshi*; Namba, Hideki

Radiation Physics and Chemistry, 75(1), p.61 - 69, 2006/01

 Times Cited Count:12 Percentile:31.51(Chemistry, Physical)

Decomposition of ${it p}$-Nonylphenols (NPs) in water at 1 $$mu$$mol dm$$^{-3}$$ was decreased exponentially with absorbed dose when NPs were irradiated by $$^{60}$$Co$$gamma$$-rays. Two products having molecular weight of 236, presumably OH adducts of NPs, were detected by LC-MS analyses. The elimination of estrogen activity of aqueous NPs solution including such irradiation products at 5000 Gy (J kg$$^{-1}$$) was confirmed by the yeast two hybrid assay. These results should expand the application of ionizing radiation to the treatment of NPs.

Journal Articles

Development of PVB film for low-dose dosimetry in radiation processing

Solomon, H. M.*; Kojima, Takuji

Nucleus, 33, p.16 - 20, 2005/00

Low-dose dosimeters were developed based on the mixture films of polyvinyl butyral (PVB) and the acid-sensitive dye leucomalachite green (LMG). Chloral hydrate (RX) was added to the mixture for enhancement of the radiation sensitivity of the film dosimeters. Different film dosimeter materials were prepared using 9.07 $$times$$ 10$$^{-5}$$mole LMG per one gram PVB with various RX:LMG molar concentration ratio. The dosimeter response, which is expressed in terms of change in absorbance at 628 nm per unit thickness, increased linearly with dose and RX concentration. The PVB-LMG dosimeter system, in which the ratio of RX concentration to that of LMG is higher than 10, show measurable dose range of 1-100 Gy for $$^{60}$$Co $$gamma$$-rays.

Journal Articles

Dyed Polyvinyl Chloride films for use as high-dose routine dosimeters in radiation processing

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

Radiation Physics and Chemistry, 69(5), p.439 - 444, 2004/04

 Times Cited Count:16 Percentile:25.78(Chemistry, Physical)

Characteristics of the polyvinyl chloride films containing 0.11wt% of malachite green oxalate or 6GX-setoglausine with 100$$mu$$m in thickness were studied for use as routine dosimeters in radiation processing. These films show basically color bleaching under $$^{60}$$Co $$gamma$$-ray irradiation in a dose range of 5 to 50 kGy. The sensitivity of the dosimeters and the linearity of dose response curves are improved by adding 2.5% of chloral hydrate [CCl$$_3$$CH(OH)$$_2$$] and 0.15% hydroquinone [HOC$$_6$$H$$_4$$OH]. These additions extent the minimum dose limit to 1 kGy covering dosimetric quality assurance in radiation processing of food and healthcare products. The dose responses of both films at irradiation temperatures of 20-35$$^{circ}$$C are constant relative to those at 25$$^{circ}$$C, and the irradiation temperature coefficients for 35-55$$^{circ}$$C were estimated to be (0.43 $$pm$$ 0.01)%/ $$^{circ}$$C. The dosimeter characteristics are stable within 1% at 25$$^{circ}$$C before and 60 days after irradiation.

Journal Articles

Effects of basicity and FeO concentration on the retention of $$^{137}$$Cs and $$^{60}$$Co in slag made from non-metallic radioactive wastes

Nakashima, Mikio; Nakashio, Nobuyuki; Kameo, Yutaka; Fukui, Toshiki*; Isobe, Motoyasu*; Otake, Atsushi*; Wakui, Takuji*; Hirabayashi, Takakuni*

Radiochimica Acta, 91(1), p.45 - 51, 2003/01

 Times Cited Count:2 Percentile:79.71(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Characterization of solidified products yielded by plasma melting treatment of simulated non-metallic radioactive wastes

Nakashima, Mikio; Fukui, Toshiki*; Nakashio, Nobuyuki; Isobe, Motoyasu*; Otake, Atsushi*; Wakui, Takuji*; Hirabayashi, Takakuni*

Journal of Nuclear Science and Technology, 39(6), p.687 - 694, 2002/06

 Times Cited Count:11 Percentile:37.96(Nuclear Science & Technology)

no abstracts in English

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

Characterization and performance study of high-dose $$^{60}$$Co $$gamma$$-ray calibration laboratory for radiation processing

Tachibana, Hiroyuki; Kojima, Takuji; ; ; Yotsumoto, Keiichi; Tanaka, Ryuichi

Radioisotopes, 48(4), p.247 - 256, 1999/04

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:36.06

no abstracts in English

Journal Articles

Sorption of $$^{60}$$Co,$$^{85}$$Sr,$$^{137}$$Cs,$$^{237}$$Np and $$^{241}$$Am on soil under coexistence of humic acid; Effects of molecular size of humic acid

Tanaka, Tadao;

Mater. Res. Soc. Symp. Proc., Vol. 353, 0, p.1013 - 1020, 1995/00

no abstracts in English

Journal Articles

Migration of radioactive $$^{85}$$Sr,$$^{134}$$Cs and $$^{60}$$Co through a loess soil layer

Z.Li*; H.Wang*; Takebe, Shinichi; Tanaka, Tadao

Mater. Res. Soc. Symp. Proc., Vol. 353, 0, p.1109 - 1115, 1995/00

no abstracts in English

JAEA Reports

Field test of radionuclide migration; Cooperative research between JAERI and CIRP

*; Yamamoto, Tadatoshi; ; Takebe, Shinichi; Ogawa, Hiromichi; Tanaka, Tadao; Mukai, Masayuki; Komiya, Tomokazu; S.Li*; Z.Wang*; et al.

JAERI-Research 94-009, 44 Pages, 1994/07

JAERI-Research-94-009.pdf:1.69MB

no abstracts in English

Journal Articles

One-dimensional activation analysis of vacuum vessel of JT-60U with deuterium gas discharges

Miya, Naoyuki; Nishitani, Takeo; Takeuchi, Hiroshi

Journal of Nuclear Science and Technology, 31(5), p.398 - 406, 1994/05

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Tensile and shear fracture behavior of fiber reinforced plastics at 77K irradiated by various radiation sources

K.Humer*; H.W.Weber*; E.K.Tschegg*; Egusa, Shigenori; R.C.Birtcher*; H.Gerstenberg*

Advances in Cryogenic Engineering Materials, Vol.40, p.1015 - 1024, 1994/00

no abstracts in English

JAEA Reports

Preliminary investigation on determination of radionuclide distribution in field tracing test site

Tanaka, Tadao; Guo, Z.*; Mukai, Masayuki; Takebe, Shinichi; S.Li*; *

JAERI-M 93-235, 17 Pages, 1993/12

JAERI-M-93-235.pdf:0.55MB

no abstracts in English

Journal Articles

Evaluation of radioactive inventory in JPDR due to neutron activation

Sukegawa, Takenori; Hatakeyama, Mutsuo

Dekomisshoningu Giho, (8), p.66 - 77, 1993/06

no abstracts in English

JAEA Reports

Radionuclide migration behavior at the low adsorption region on the aerated soil testing, the second report; Effect of inflow volume and migration analysis

Takebe, Shinichi; Mukai, Masayuki; Komiya, Tomokazu; Kamiyama, Hideo

JAERI-M 93-034, 15 Pages, 1993/02

JAERI-M-93-034.pdf:0.74MB

no abstracts in English

JAEA Reports

Radionuclide migration behavior at the low adsorption region on the aerated soil testing

Takebe, Shinichi; Mukai, Masayuki; Komiya, Tomokazu; Kamiyama, Hideo

JAERI-M 92-205, 19 Pages, 1993/01

JAERI-M-92-205.pdf:0.77MB

no abstracts in English

Journal Articles

Radiation effects on polymer matrix composites

Egusa, Shigenori

Hoshasen Kagaku, 0(55), p.13 - 22, 1993/00

no abstracts in English

30 (Records 1-20 displayed on this page)