The Internal Conversion Coefficients ofNb95,Zn65, andSc46

The theory of nuclear $\gamma$-ray yield determination from Compton electron spectra has been recently developed by Thomas and Lauritsen for interpretation of electron spectra from photoelectric and Compton conversion processes observed with a magnetic lens $\beta$-ray spectrometer. The total internal conversion coefficient ($\frac{N_e}{N_{\gamma }}$) is measured by determining $N_{\gamma }$ from a high-energy segment of the Compton electron spectrum observed from a thick (140-mg/${\mathrm{cm}}^2$) aluminum converter and $N_e$ from the internal conversion spectrum of the same source observed without a radiator. The total internal conversion coefficients of two of the isotopes, ${\mathrm{Mo}}^{95}$ (parent, ${\mathrm{Nb}}^{95}$) and ${\mathrm{Ti}}^{46}$ (parent, ${\mathrm{Sc}}^{46}$), were also determined by the direct comparison of areas under their internal conversion and beta-spectrum curves and so permitted a check of the new method.