ELEMENT CONCENTRATIONS IN CANDIDATE BIOLOGICAL AND ENVIRONMENTAL REFERENCE MATERIALS BY K0-STANDARDIZED INAA

k(o)-Based Neutron Activation Analysis (k(o)INAA) was used to analyze the candidate reference materials Apple Leaves and Peach Leaves, and Oriental Tobacco Leaves and Virginia Tobacco Leaves. Concentration values for 27 elements were measured. The accuracy was ascertained by analysis of two certified reference materials, NIST 1572 Citrus Leaves and 1573 Tomato Leaves. The homogeneity test of the IAEA Evernia prunastri candidate reference material in aliquots greater-than-or-equal-to 100 mg is extended to the elements Sc, Cr, Fe, Co, Zn, Rb, Sb, Cs, Ba, Ce and Th.