Abstract
In the measurement of natural occurring radioactive material (NORM) concentrations of 40 K , 232 Th and 238 U are measured by passive gamma ray spectrometry with either HPGe or NaI(Tl) detectors. 40 K is measured through its 1460.8 keVγ line. However, till now it has been ignored that this line is mixed with the 1459.2 keV line of 228 Ac from the chain of 232 Th . A correction must be made for this contribution. All the data in literature has wrong data about the concentration of 40 K although in many cases the error is less than 1%. However, there are cases of considerably higher errors. It should be emphasized that even if the correction in 40 K concentration is large the correction of external dose index is negligible due to the higher weighing factor for 232 Th than for 40 K (by at least a factor of 10).
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