Photographic bent crystal gamma spectrometer

Abstract

A 1-meter bent crystal gamma-ray spectrometer is described. The gamma lines are registered on Ilford G5 nuclear emulsions. By counting with a microscope the electron tracks forming a line, it is possible to determine gamma intensities. Corrections have to be made for emulsion efficiency, crystal reflectivity and the geometry of the spectrometer. The accuracy of this method is controlled by the measurements of some known lines in Ta¹⁸². In addition the energies and intensities of two lines in Sm¹⁵³ are given: 69.66±0.02 keV and 103.18±0.04 keV; intensity ratio 9 to 100.