Precision wave-length and energy measurement of gamma-rays from Au198 with a focusing quartz crystal spectrometer

A recent paper(1) describes a precision focusing curved crystal x-ray and gamma-ray spectrometer (2-meter focal length) constructed at the California Institute of Technology. This instrument has now been used to study the 0.41-Mev gamma-ray line from a 1-curie source of the artificial radioactive isotope of gold, Au198, of half-life 2.7 days.