INAA OF IAEA-331 (SPINACH), SRM, FOR 40 ELEMENTS

Forty elements in IAEA-331 (Spinach), an intercomparison material, hav e been determined using NAA. Among them, 30 elements, Ag, Al, Ba, Br, Ca, Ce, Cl, Co, Ct, Cs, Eu, Fe, Hf, K, La, Mg, Mn, Na, Ni, Rb, Re, Sc, Se, Sr, Ta, Tb, Th, V, Zn and Zr were determined by INAA. A series of simple and quantitative radiochemical separation procedures were esta blished for the determination of ten additional elements, Cd, Lu, Mo, Sb, Sm, Yb, U were determined by removing the major interfering nuclid e Br-82, CU was determined by 0.048 M NaDDTC/CHCl3 extraction from 1 M HCl medium. As and P were determined using an inorganic exchange colu mn of acid aluminium oxide (AAO). Integral counts from 80 keV to 130 k eV contributed by Bremsstrahlung from P-32 beta(-) were used to evalua te the content of phosphorus.