Precision Measurements of Gamma-Ray Wavelengths of the Radium and Thorium Series Using the Focussing Crystal Spectrometer

Author: Klein, David Joseph

Year: 1951

Degree: Dissertation (Ph.D.)

Advisor: DuMond, Jesse William Monroe

Committee Member: Unknown, Unknown

Option: Physics; Mathematics

DOI: 10.7907/DEEP-WY61

Abstract

The curved crystal spectrometer is described very briefly. The preparation and mounting of sources of radon and radiothorium for use in the instrument is described. Certain calculations of line profiles to be observed are carried out and a graphical method is given which permits rapid estimate of the important features of the profile as functions of the source geometry. The construction of multicellular Geiger counters and measurements of their efficiency are described. The results of precision measurements of five gamma-ray lines and one x-ray line of the radium spectrum are given, as well as those of site gamma-ray lines of the thorium spectrum.

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