The paper by Crossley and Reid (1982) deals with the analysis of multichannel airborne gamma-ray spectra. In their final summary, they state that the background gamma-ray spectrum generated by cosmic radiation can apparently fluctuate within short ( approximately seconds) time intervals. They remark that this conclusion leads to doubts as to the validity of measuring background radioactivity over lakes for airborne surveys. This procedure is standard practice in Canada where lakes are abundant (Richardson et al, 1975).

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