TheHρof the High Energy Internal Conversion Electrons from Thorium D

Abstract

The absolute $H_{\rho }$ of the $K$ internal conversion electrons from the 2.6-Mev gamma-ray of ThD has been measured using a 180° magnetic spectrometer whose field was calibrated with the proton magnetic resonance. With a proton resonance frequency, ${\nu }_P$, of 3.75 megacycles, corresponding to a field of 880 gauss and an electron radius, $\rho$, of 11.4 cm, the value ${\nu }_{P\rho }=42.528\mathrm{}\pm 0.008$ megacycle cm was obtained for the line. This is equivalent, through the proton gyromagnetic ratio, to an $H_{\rho }={9988}_{.4}\pm 2$ gauss cm.