Über Beobachtungen der durchdringenden Strahlung bei sieben Freiballonfahrten
19128 pages
Published in:
- Phys.Z. 13 (1912) 1084-1091
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Abstract:
Last year I had the opportunity to investigate the penetrating radiation during two balloon flights. I reported on the first of these to the scientific meeting of Karlsruheà In both flights no essential variation in the radiation could be observed up to heights of ,àà meters. Gockel, also, in two balloon °ights, was unable to detect the expected diminution in intensity of the radiation with heightà From this it was con- cluded that besides the radiation from the radioactive element in the earth's crust there must be another source of penetrating radiationà Two Wulf radiation apparatuses of 3 mm, wall thickness were used for the observationsà Apparatus Noà I had an ionization cell with a value of 2à39 cc and a capacity of à59à cmà Apparatus Noà 2 had a volume of 29àà cc and a capacity of àà9à cmà A charge loss corresponding to a decrease of volt per hour thus rep- resented an intensity of ionization of = à56 ions per cc per second in Apparatus No and = ààà355 ions per cc per second in Apparatus Noà 2à Whereas all observers of the penetrating radiation on the top of towers have always con ̄rmed a decrease of the penetrating radiation, Gockel and I in balloon °ights could not detect such a decrease with certaintyà In order to obtain reliable mean values it was necessary to carry out observation in long lasting flights at modest heights.References(0)
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