Elemental analysis by neutron inelastic scatter gamma rays with a radioisotope neutron source

Abstract

The measurement of prompt γ-rays from neutron inelastic scattering is a promising technique for the bulk analysis of samples in the mineral industry. Applications will probably involve the use of radioisotope neutron sources and scintillation detectors. With scintillation detectors, it is important to be able to predict the effect of inter-element interferences. The photopeak intensities of 81 γ-rays from 21 elements have been measured using a Ge(Li) detector and 238Pu-Be source. These intensities have been used to calculate the photopeak intensities in the more industrially suitable NaI(Tl) detectors. The calculated NaI(Tl) photopeak intensities have been checked by measurement on prominent γ-rays from some elements. Examples are given of the applications of the present data to the prediction of γ-ray yields, and inter-element interferences in potential industrial applications. The technique is best suited to the analysis of elements of concentration >1 wt. % and preferable >5 wt. % in samples of about 10-100 kg. Preliminary results are presented of the application of the neutron inelastic scattering technique to the analysis of Pb/Zn ores. © 1979.