Other
Scientific paper
Feb 1950
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950phrv...77..380m&link_type=abstract
Physical Review, vol. 77, Issue 3, pp. 380-383
Other
2
Scientific paper
By measurements of twofold, threefold, and fourfold coincidences with a Geiger counter telescope, the underground rays at 660 and 540 m w.e. (water equivalent) have been divided into two components. One of the components is ionizing, discharging the counters with almost 100 percent efficiency, and has a strong maximum in the vertical direction. The other component discharges the counters with a very low efficiency, producing numerous twofold coincidences but practically no threefold or fourfold coincidences. It is isotropic in direction and rapidly absorbed in lead. This second component is thought to be composed of γ-rays of local radioactive origin. The telescope used in these experiments differed from that of Barnóthy and Forró in that it was protected from side showers by anticoincidence counters. The ratio of twofold to threefold coincidences was found to be about 1.4 instead of 20 as reported by Barnóthy and Forró at 1000 m w.e.
Jurkiewicz L.
Massalski J. M.
Miesowicz M.
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