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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

Radiation-induced swelling and softening in magnesium aluminate spinel irradiated with high-flux Cu$$^{-}$$ ions

Lee, C. G.; Omura, Takahito*; Takeda, Yoshihiko*; Matsuoka, Saburo*; Kishimoto, Naoki*

Journal of Nuclear Materials, 326(2-3), p.211 - 216, 2004/03

 Times Cited Count:4 Percentile:29.31(Materials Science, Multidisciplinary)

Magnesium aluminate spinel of single crystal was irradiated with 60 keV Cu$$^{-}$$ at a dose rate up to 100 $$mu$$A/cm$$^{2}$$, to a total dose of 3$$times$$10$$^{16}$$ ions/cm$$^{2}$$, in order to study changes in hardness and step-height swelling by high-flux implantation. Hardness determined by nano-indentation measurements steeply decreased with implantation. There is a strong negative correlation between dose-rate dependences of the hardness and the step-height swelling: the former decreases as the latter increases. The Rutherford Backscattering Spectrometry (RBS)/channeling measurements showed that the spinel is not completely amorphized over the dose-rate range in this study, and the radiation-induced softening observed is not due to amorphization. Results of optical absorbance suggested that radiation-induced point defects and their clusters on the anion sublattices of the spinel played an important role in the radiation-induced swelling under high-flux ion implantation.

Journal Articles

Decoloration and degradation of azo dye in aqueous solution supersaturated with oxygen by irradiation of high energy electron beams

Hosono, Masakazu; Arai, Hidehiko; Aizawa, Masaki*; Yamamoto, Ichiro*; Shimizu, Ken*; Sugiyama, Masahi*

Applied Radiation and Isotopes, 44(9), p.1199 - 1203, 1993/00

 Times Cited Count:22 Percentile:86.82(Chemistry, Inorganic & Nuclear)

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