Transition Curves of 330-Mev Bremsstrahlung

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Abstract
Transition curves produced by 330-Mev bremsstrahlung from the Berkeley synchrotron have been measured in carbon, aluminum, copper and lead. The measurements have been made with a thin ionization chamber "immersed" in the materials under study. The results are in agreement with expected shower behavior. An important part of this investigation is to provide a suitable means for standardizing the synchrotron beam. This is accomplished in two ways. (1) The area of the shower curves gives a good measure of the beam energy. (2) Analysis of transition curves with thin converters permits separation of Compton and pair electron ionization. The pair ionization can be compared with theory and the primary energy deduced. Agreement between these methods is very good. As a result of these measurements absolute cross section measurements in the synchrotron beam become possible.

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