The volatilization losses of mercury before, during and after neutron irradiation were studied. To minimize the losses, respectively,
were added to the standards, thiourea, L-cysteine, thioacetamide and ammonium sulfide. It was possible to minimize the losses
by preserving the standard at −20°C after irradiation. No loss was seen in the biological materials after irradiation.
Authors:Y. Yasuoka, T. Ishikawa, S. Tokonami, H. Takahashi, A. Sorimachi, and M. Shinogi
Room experiments were conducted to investigate the effects of an air cleaner on radon mitigation. Radon concentration, equilibrium
equivalent radon concentration and unattached fraction were measured during the experiments. Two types of filtration were
tested using the air cleaner which has a high efficiency particulate air filter (HEPA-filter) and a deodorizing activated
carbon (carbon-filter). One is the filtration with the HEPA-filter plus carbon-filter and the other is the filtration with
only the HEPA-filter. The effective doses from radon progeny were significantly decreased. Both filtration methods were effective
for the mitigation of effective dose due to radon progeny.
Authors:S. Ohmori, H. Tsuji, Y. Kusaka, T. Takeuchi, T. Hayashi, J. Takada, M. Koyama, H. Kozuka, M. Shinogi, A. Aoki, K. Katayama, and T. Tomiyama
With the aim of indicating environmental pollution effects by heavy metals on humans using hair, nondestructive activation
analysis was applied to 382 normal Japanese hair samples (background level). Elemental contents of hair could be determined
for Ag, Al, As, Br, Ca, Cd, Cl, Co, Cr, Cu, Fe, Hg, I, K, La, Mg, Mn, Na, S, Sb, Sc, Se, Sm, Ti, V and Zn. As these elements
in hair have wide concentration ranges, the differences in concentrations distribution between groups (sex, age, permanent
treatment and regional difference) are discussed. A method for hair sampling is presented.