Analytical Sciences

Determination of Multielements in a Typical Japanese Diet Certified Reference Material by Instrumental Neutron Activation Analysis

Shogo SUZUKI, Yukiko OKADA, and Shoji HIRAI

Faculty of Engineering, Musashi Institute of Technology, 1-28-1, Tamazutsumi, Setagaya, Tokyo 158-8557, Japan

Multielements in a typical Japanese diet certified reference material prepared at the National Institute for Environmental Studies (NIES) of Japan, in collaboration with the National Institute of Radiological Sciences (NIRS) of Japan were determined by instrumental neutron activation analysis (INAA). Five samples (ca. 510 - 1000 mg) and comparative standards were irradiated for a short time (10 s) at a thermal neutron flux of 1.5 x 10¹² n cm^-2 s^-1 (pneumatic transfer) and for a long time (6 h) at a thermal neutron flux of 3.7 x 10¹² n cm^-2 s^-1 (central thimble) in the Rikkyo University Research Reactor (TRIGA Mark-II, 100 kW). The irradiated samples were measured by conventional γ-ray spectrometry using a coaxial Ge detector, and by anti-coincidence and coincidence γ-ray spectrometry with a coaxial Ge detector and a welltype NaI(Tl) detector. The concentrations of 38 elements were determined by these methods.

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