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High Frequency Rays of Cosmic Origin

Millikan, Robert Andrews (1925) High Frequency Rays of Cosmic Origin. Science, 62 (1612). pp. 445-448. ISSN 0036-8075.

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It was as early as 1903 that the British physicists, Rutherford and McLennan, noticed that the rate of leakage of an electric charge from an electroscope within an air-tight metal chamber could be reduced by enclosing the chamber within a completely encircling metal shield or box with walls a centimeter or more thick. This meant that the loss of charge of the enclosed electroscope was not due to imperfectly insulating supports, but must rather be due to some highly penetrating rays, like the gamma rays of radium, which could pass through metal walls as much as a centimeter thick and ionize the gas inside.

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Additional Information:© 1925 American Association for the Advancement of Science. Read to the National Academy of Sciences, Madison, November 9, 1925.
Issue or Number:1612
Record Number:CaltechAUTHORS:20141212-164523669
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Official Citation:High Frequency Rays of Cosmic Origin Robert Andrews Millikan Science, New Series, Vol. 62, No. 1612 (Nov. 20, 1925), pp. 445-448 Published by: American Association for the Advancement of Science Article Stable URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52794
Deposited By: George Porter
Deposited On:15 Dec 2014 16:12
Last Modified:03 Oct 2019 07:44

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