Authors:A. Imahori, I. Fukushima, S. Shiobara, Y. Yanagida, and K. Tomura
Applying instrumental neutron activation analysis, multielement analysis of human hair was carried out to elucidate the levels
of various trace element concentrations in hair of local population in the Tokyo metropolitan area. 202 hair samples were
collected from the inhabitants classified by sex and five age groups. Using several combinations of irradiation time, cooling
time and counting time, forty elements were quantitatively analyzed. The method of analysis for data including samples under
detection limit is discussed, assuming that the frequanecy distribution of trace element contents in hair is log-normal.
Authors:F. Ambe, Y. Ohkubo, S. Ambe, Y. Kobayashi, T. Okada, Y. Yanagida, J. Nakamura, K. Asai, Y. Kawase, and S. Uehara
The features of time-differential perturbed angular correlation (TDPAC) in studies on local chemical structures around impurity atoms are described in comparison with those of Mössbauer emission spectroscopy with four typical examples of recent applications to metal oxide systems, namely,99Rh
99Ru in -Fe2O3 and YBa2Cu3O7– and117Cd
117In in MO (M=Mn, Co, Ni) and BaRu2/3Cd1/3O3.
Authors:C. Mori, T. Suzuki, S. Koido, A. Uritani, H. Miyahara, K. Yanagida, Y. Wu, K. Nishizawa, M. Yoshida, F. Takahashi, and J. Miyahara
Distribution images of natural radioactivity in natural materials such as vegetables were obtained by using Imaging Plate. In such cases, it is necessary to reduce background radiation intensity by one order or more. Graded shielding is very important. Especially, the innermost surface of a shielding box should be covered with acrylic resin plate. We obtained natural radioactivity distribution images of vegetables, sea food, meat etc. Mostly -rays emitted from40K print the radioactivity distribution image. Comparison between -ray intensity of KCl solution measured with HPGe detector and that of natural material specimen gave the radioactivity around 0.060.4 Bq/g depending on the kind and the part of specimens.