New Methods of Determining the Absolute Intensity of Cosmic Rays in the Atmosphere and the Residual Ionization in Ionization Chambers
- 15 October 1949
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 76 (8) , 1205-1208
- https://doi.org/10.1103/PhysRev.76.1205
Abstract
The portable Gish-Sherman ionization meter in connection with four geometrically similar cylindrical ionization chambers of different size was used for determining (1) the cosmic-ray intensity at sea level when the apparatus is completely shielded from local radiations by 10 cm of iron, and (2) at the same time a value for the residual ionization produced by spurious alpha-particles from the walls of the chambers. Two methods to obtain this end are described: one using all four chambers, and the other using the largest chamber and varying the pressure of the filling gas. Plotting the observed ionization versus the ratio of surface: volume gives a straight line which, when extrapolated for infinite volume leads to the value representing the ionization produced by cosmic rays without the secondaries from the wall.Keywords
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