On the high-resolution gamma-ray spectrometric measurement of 40K in natural and synthetic materials

Many regulatory agencies require that all building materials and industrial waste be tested for their naturally occurring radioactive material (NORM) concentrations before they can be used or thrown away. Usually the NORMconcentrations of 4 0 K, 2 3 2 Th and 2 3 8 U are measured by gamma-ray spectrometry using high-purity germanium or NaI(Tl) detectors. 4 0 K is measured through its 1460.8 keV gamma line, which is mixed with 1459.2 keV line of 2 2 8 Ac from the chain of 2 3 2 Th. This fact ignored till now, requires a correction in the computation of 4 0 K concentration. Although in many cases the error is <1%, there are cases where there have been higher errors. It should be emphasised that even if the correction in 4 0 K concentration is large, the correction of the external dose index is negligible owing to the weighing factor being higher for 2 3 2 Th than for 4 0 K (by at least a factor of 10).