Abstract
MEASUREMENTS of penetrating radiation of the earth executed at Piatigorsk (in the Caucasus) by means of a portable electrometer covered with lead 1 cm. thick have shown that, though the same apparatus was used, the intensity fluctuated according to the stations of observation where the measurements were made. The fluctuations of intensity were especially marked in places rich in radium, where differences of so much as 100 per cent. were observed between stations separated by a few metres only.
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BOGOIAVLENSKY, L., LOMAKIN, A. Experiments on highly penetrating Radiation from the Earth. Nature 119, 525 (1927). https://doi.org/10.1038/119525a0
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DOI: https://doi.org/10.1038/119525a0
