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Journal Articles

Gamma-ray spectrometer based on a transition edge sensor for nuclear materials analysis

Hatakeyama, Shuichi*; Ono, Masashi*; Takahashi, Hiroyuki*; Damayanthi, R. M. T.*; Otani, Chiko*; Yasumune, Takashi; Onishi, Takashi; Takasaki, Koji; Koyama, Shinichi

Journal of Low Temperature Physics, 176, p.560 - 565, 2014/01

https://doi.org/10.1007/s10909-014-1090-z
 Times Cited Count：8 Percentile：32.39(Physics, Applied)

We designed and fabricated a hard X-ray and gamma-ray TES spectrometer for nuclear materials analysis. The superconducting tin absorber is coupled to an Ir/Au TES by using a gold post to improve the thermal contact between the absorber and the TES. The reported energy resolution is 156 eV FWHM at 59.5 keV and 166 eV FWHM at 122 keV gamma-rays. We performed measurement of a Pu sample and clearly separated the $$^{239}$$Pu (56.828 keV) and the $$^{241}$$Am (59.5 keV) peaks by this TES microcalorimeter which cannot be resolved by the HPGe detector.

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

https://doi.org/10.1016/j.radphyschem.2005.05.016
 Times Cited Count：13 Percentile：63.52(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.

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