JOPSS - Search Results

Journal Articles

Effect of heavy ion irradiation on optical property of radiation-crosslinked hydroxypropyl cellulose gel containing methacrylate monomers

Hiroki, Akihiro; Yamashita, Shinichi*; Kimura, Atsushi; Nagasawa, Naotsugu; Taguchi, Mitsumasa

Nuclear Instruments and Methods in Physics Research B, 365(Part B), p.583 - 586, 2015/12

Effects of liner energy transfer (LET) and dose rate on the optical property of polymer gel dosimeters were investigated. The dosimeter prepared by using a radiation-crosslinked hydroxypropyl cellulose gel and methacrylate monomers such as 2-hydroxyethyl methacrylate and nonaethylene glycol dimethacrylate showed the color change from colorless to white with the He, C, Fe ions irradiation. Absorbance of the irradiated dosimeters increased with the dose up to 10 Gy. The absorbance of the dosimeters at the same total dose decreased with increasing dose rate in the range of 0.1 to 6.8 Gy/min. The absorbance decreased in order of He, C, Fe ions, which was in agreement with a change of LET. The increase in LET affected the decrease in the number of polymerization initiator such as OH radical and hydrated electron, resulting in the reduction of the absorbance of the dosimeters.

Journal Articles

Educational material kit to learn radiation effect on plastic

Nagasawa, Naotsugu; Taguchi, Mitsumasa

Isotope News, (736), p.47 - 50, 2015/08

http://www.jrias.or.jp/books/pdf/201508_RIJYUKU_NAGASAWA_TAGUCHI.pdf

no abstracts in English

Journal Articles

Changes in the mechanical properties of silk scaffold by rays-irradiation

Kawahara, Yutaka*; Sekiguchi, Takahiro*; Nishikawa, Yukihiro*; Nagasawa, Naotsugu

Nihon Shiruku Gakkai-Shi, 23, p.67 - 69, 2015/03

http://doi.org/10.11417/silk.23.67

Silk aerogel has been prepared from liquid silk, and the influences of the ray-irradiation on its mechanical property have been investigated. The formation of crosslinking structure in the sericin component by the ray-irradiation should induced the hardening of the silk aerogel.

Journal Articles

Adsorption of metal ions by carboxymethylchitin and carboxymethylchitosan hydrogels

Wasikiewicz, J. M.; Nagasawa, Naotsugu; Tamada, Masao; Mitomo, Hiroshi*; Yoshii, Fumio

Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.617 - 623, 2005/07

https://doi.org/10.1016/j.nimb.2005.04.053

Times Cited Count：54 Percentile：95.02(Instruments & Instrumentation)

The absorption ability of various metal ions into EB - radiation crosslinked carboxymethylchitin and carboxymethylchitosan has been investigated. The highest adsorption of Scandium and Gold has been obtained for carboxymethylchitin (CMCht) and carboxymethylchitosan (CMChts), respectively. Kinetic studies showed that adsorption of most of the metal ions occur in a relatively short period of time (2 hours). Detail investigation of adsorption of gold ions has been carried out for both hydrogels. The maximum uptake of Au cations, based on Langmuir equation was determined to be 37.59 mg/g for CMChts and 11.86 mg/g for CMCht. Both hydrogels indicate favorable adsorption of gold cations.

Journal Articles

Radiation grafting of styrene into crosslinked PTEE films and subsequent sulfonation for fuel cell applications

Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Morita, Yosuke; Suwa, Takeshi; Chen, J.*; Tsubokawa, Norio*; Kobayashi, Kazuhiro*; Kubota, Hitoshi*; Yoshida, Masaru

Radiation Physics and Chemistry, 67(3-4), p.403 - 407, 2003/08

https://doi.org/10.1016/S0969-806X(03)00075-6

Times Cited Count：76 Percentile：97.02(Chemistry, Physical)

no abstracts in English

Journal Articles