Data measured with a small Geiger counter for a period of approximately three months were analyzed to search for daily variation effects, after proper correction for the influence of the atmospheric pressure. Harmonic dial analysis for each individual day was carried out. The ratio of the measured flux between selected intervals within the 24 hours was also investigated. Methods and results are presented in the framework of educational studies involving high-school teams.
Paola et al. (Wed,) studied this question.