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[References: 15 tit.]

Atmospheric precipitation introduces significant changes in the gamma background, making it difficult to analyze data from radiation monitoring systems. A criterion for identifying changes in the gamma background caused by atmospheric precipitation is proposed. Measurements of changes in the gamma background and the level of precipitation were performed at two independent observation sites. The time spectra of the gamma background were analyzed. The characteristic elements caused in the spectra by atmospheric precipitation are identified and classified. It is shown that the changes brought about in the gamma background by atmospheric precipitation can be identified according to the exponent of an exponential function describing the gamma background reduction following after the maximum is reached. If several consecutive peaks are present in the spectrum, identification is possible according to the gamma background reduction after the final peak.