Internal Conversion Spectrum ofAu198

An absolute energy determination for the internal conversion electrons from ${\mathrm{Au}}^{198}$ has been made with our electrostatic analyzer. The gamma-ray energy has been determined from these results to be 411.76±0.19 kev. The intensity ratios ($L_{\mathrm{I}}:L_{\mathrm{II}}:L_{\mathrm{III}}$) in the $L$ subshell are found to be (1.9±0.3): (2.2±0.3): 1.0, in agreement with theory for an $E2\mathrm{}$ transition. A determination of the internal conversion coefficients gave ${\alpha }_K=0.025\mathrm{}\pm 0.005$ and ${\alpha }_L=0.012\mathrm{}\pm 0.002$.