15—_—3. IONIZATION ”OF GASES BY COSMIC RAYS 345
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meters of water). Wilson made measurements in a mine to a depth
of 1033 meters water equivalent. '
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A curve of the intensity of the cosmic rays at different depths
(equivalent water depths) below the surface of theearth’s atmosphere is shown in gure 15—3. From this curve, absorption coei—
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cients have been computed and have shown that cosmic: rays
consist of several, probably three, components of varying degrees of
penetrating power. Thus, some of the rays‘do not reach the
surface of the earth, others
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just penetrate the atmosphere and
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the third group are able to travel
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several hundred meters into the
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15—3.
The Ionizationof Gases
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by Cosmic Rays.——In the cosmic FIG'.15.‘41 Apparatus t° mea,S“Îe
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to observe the ionization produced by the cosmic rays has been
Separated from the chamber itself; 'The ion‘ization chamber A’
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consists of a hollow steelball sûrrounded by one inch of bronze
and two inches of lead. Thé
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compared with that of the cosmiç…raya
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