Absorption of Cosmic Rays in Lead

THE absorption curve for cosmic radiation in lead for small thicknesses of absorber (0–30 cm.) has been measured by many observers. The general shape of the curve is not in doubt, but several observers have obtained differences in detail. Clay 1 and co-workers, using ionization chambers, have obtain...

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Bibliographic Details
Published in:Nature (London) 1951-06, Vol.167 (4257), p.895-896
Main Authors: HEYLAND, G. R, DUNCANSON, W. E
Format: Article
Language:English
Subjects:
Cosmic Radiation
Humanities and Social Sciences
Humans
Lead
letter
multidisciplinary
Old Medline
Science
Science (multidisciplinary)
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Summary:THE absorption curve for cosmic radiation in lead for small thicknesses of absorber (0–30 cm.) has been measured by many observers. The general shape of the curve is not in doubt, but several observers have obtained differences in detail. Clay 1 and co-workers, using ionization chambers, have obtained three maxima at 1.5, 17 and 25 cm. These maxima disappeared when a Geiger–Müller telescope was employed and the absorber was placed within the telescope. With the absorber above the telescope, two rather extended maxima appeared at about 15 and 30 cm. Clay associates these with maxima observed in the absorption curve for showers. George and Appapillai 2 have used a counter telescope with the absorber placed within it, and find a plateau region at about 10–17 cm., but no maxima. More recently, Fenyves and Haiman 3 have obtained pronounced maxima in the absorption curve at 17 and 25 cm. They used counter telescopes and determined two consecutive points simultaneously. (The position of the absorber is not mentioned.) George, Jánossy and McCaig 4 report that the second maximum in the shower curve is instrumental and not real, unless it be very small.
ISSN:0028-0836
1476-4687
DOI:10.1038/167895a0