Accession Number : AD0612989

Title :   PRECISION MEASUREMENT OF THE MOMENTA OF CONVERSION ELECTRON LINES FROM SOURCES OF 212PB (THB),

Corporate Author : ATOMIC ENERGY OF CANADA LTD CHALK RIVER (ONTARIO)

Personal Author(s) : Graham,R. L. ; Murray,G. ; Geiger,J. S.

Report Date : 26 OCT 1964

Pagination or Media Count : 22

Abstract : Momentum ratios of some of the more intense internal conversion lines from sources of thorium radioactive deposit have been determined with accuracies of 1 to 4 parts in 100,000 using an iron-free beta spectrometer. Accurate absolutevalues of the momenta were obtained from intercomparisons of these line momenta with that of the K-412 internal conversion line in 198Hg. The X-ray self-calibration method of Siegbahn is discussed in some detail and is shown to be less accurate at this time. The results are analyzed on both the 1955 and 1963 least-squares adjusted values of the fundamental constants. (Author)

Descriptors :   (*INTERNAL CONVERSION, MOMENTUM), (*LEAD(METAL), INTERNAL CONVERSION), ELECTRON TRANSITIONS, BETA RAY SPECTROSCOPY, THORIUM, MERCURY, GAMMA EMISSION, NUCLEAR RADIATION SPECTROMETERS, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE