機器中性子放射化分析による魚肉粉末標準試料中の多元素定量

抄録

Trace elements in a certified reference material No. 11 Fish Tissue (Sea Bass), prepared by the National Institute for Environmental Studies of Japan (NIES), were determined by instrumental neutron activation analysis (INAA). Portions of the Fish Tissue sample (ca.400-1000 mg) were irradiated either for a short time (30 s) at a thermal neutron flux of 1.5×10¹² n cm ^-2s^-1 or for a long time (5 h) at a thermal neutron flux of 3.8×10¹² n cm ^-2s^-1 in the Musashi Institute of Technology Research Reactor (MITRR). Gamma-ray spectra for the irradiated samples were measured with a coaxial Ge detector coupled to a multichannel analyzer. Concentrations of 24 elements (Sn, Na, Mg, Al, S, Cl, K, Ca, Sc, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Br, Rb, Sr, Sb, I, Cs and Hg) were determined by this method. The lower limits of determination for 53 elements were also calculated. For example the concentration of Sn obtained was 2.3±0.3 ppm which was in good agreement with the NIES certified value.