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Sakoda, Akihiro*; Ishimori, Yuu; Hanamoto, Katsumi*; Kawabe, Atsushi*; Kataoka, Takahiro*; Nagamatsu, Tomohiro*; Yamaoka, Kiyonori*
Applied Radiation and Isotopes, 68(10), p.2013 - 2015, 2010/10
Times Cited Count：1 Percentile：9.64(Chemistry, Inorganic & Nuclear)The performance of IPs has not been studied at temperatures lower than 0
C. In the present study, an IP was irradiated with 
rays emitted from the mineral monazite at temperatures between -80 and 30C to determine its fundamental properties. The IP response as a function of irradiation time was found to be linear, suggesting that the IP works properly at low temperatures. Fading, an effect which should be considered at temperatures of more than 0C, was not observed at -30 and -80C. Furthermore, the fading-corrected PSL value of the IP irradiated at -80C was lower than at other temperatures (30, 5 and -30C). This can be explained by TSL. Since the only intensive TSL peak in the temperature range from -80 to 30C is present at about -43C, some of the electrons trapped at F centers recombine with holes through the process of TSL before the stored radiation image is read out at room temperature.
Sakoda, Akihiro*; Hanamoto, Katsumi*; Ishimori, Yuu; Nagamatsu, Tomohiro*; Yamaoka, Kiyonori*
Applied Radiation and Isotopes, 66(5), p.648 - 652, 2008/05
Times Cited Count：38 Percentile：89.66(Chemistry, Inorganic & Nuclear)The chemical composition was analyzed and the radioactivity, radon exhalation rate and emanation fraction were measured to investigate the characteristics of the granites sampled at Misasa and Badgastein, world famous for radon therapy. The Misasa granite was probably composed of quartz, albite and microcline. The Badgastein granite was probably composed of quartz and muscovite. The radon exhalation rates and emanation fractions of the Misasa granite were much higher than those of the Badgastein granite, regardless of the 
Ra activity concentrations.
Sakoda, Akihiro*; Hanamoto, Katsumi*; Ishimori, Yuu; Nagamatsu, Tomohiro*; Yamaoka, Kiyonori*
Radiation Measurements, 43(1), p.106 - 110, 2008/01
Times Cited Count：18 Percentile：73.13(Nuclear Science & Technology)In order to determine the best physical conditions for leaching more radon from minerals into water, we measured the leaching rate of radon from radioactive minerals under the conditions of some different grain sizes and water temperatures. Water temperature affected the leaching rate of radon although the grain size did not significantly affect it. Furthermore, we proposed ultrasonic irradiation to the mixture of a mineral and water as the method of leaching more radon. Ultrasonic irradiation was efficient to leach more radon from the mineral soaked in water because of ultrasonic cavitation.
