Abstract
THE Steinke apparatus, which recorded the ionisation caused by the cosmic ultra-radiation at Abisko in northern Sweden during the polar year 1932–331, was moved in the middle of July to the iron ore mine Kiirunavaara, near Kiruna, in order to record the absorption curve of the cosmic ultra-radiation below various thicknesses of iron ore. The Kiirunavaara mountain is pierced at different levels by numerous galleries with rail tracks, some of which follow the ore body through its whole length (4 km.). It was therefore possible to move the apparatus, placed on a wagon or trolley, below layers of pure iron ore of different thickness from 160 to 10 metres, corresponding to water equivalents of 800–50 metres (the specific gravity of the ore being 5). Above the ore is only the atmosphere.
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References
Lund Obs. Circ., 6, 1931.
Phys. Z., 34, 306; 1933.
"Radioaktivität", p. 419; 1927.
Berlin Ber., 23; 1933.
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CORLIN, A. A New Hard Component of the Cosmic Ultra-Radiation. Nature 133, 63 (1934). https://doi.org/10.1038/133063a0
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DOI: https://doi.org/10.1038/133063a0
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