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The absorption coefficient of hard gamma-rays

Chao, C. Y. (1930) The absorption coefficient of hard gamma-rays. Proceedings of the National Academy of Sciences of the United States of America, 16 (6). pp. 431-433. ISSN 0027-8424. doi:10.1073/pnas.16.6.377.

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The relation between the frequency of hard radiations and the absorption coefficient is not experimentally well established at the present time. In order to obtain definite information it is necessary to use a radiation with high homogeneity. γ-Rays from ThC” are found to fulfill this requirement. Investigations of the absorption coefficient of these rays have been made by Russell and Soddy,(1) and Rutherford and Richardson,(2) almost 20 years ago before the modem technique of sensitive current measurement was developed.

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Additional Information:Copyright © 1930 by the National Academy of Sciences. Communicated May 15, 1930. I should like to express my gratitude to Professor R. A. Millikan and Professor I. S. Bowen for the suggestion of this experiment and their help in carrying it through, and also to Dr. H. N. McCoy who helped with the preparation of the Radio-Thorium.
Issue or Number:6
Record Number:CaltechAUTHORS:CHApnas30
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5756
Deposited By: Tony Diaz
Deposited On:01 Nov 2006
Last Modified:08 Nov 2021 20:28

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