Abstract
A standard is described which can be used to calibrate Ge(Li) detectors for measuring radioactive gaseous samples in 33-mL glass spheres. The method of source preparation can be applied to other types of counting bottles. The γ-ray energies of this source, 226Ra plus progeny, range from 46 to 1765 keV. The uncertainties in the emission rates for the various γ rays in the source are estimated to be about 3%. (6) The source has a half life of 1600 y and coincidence-summing corrections are minor.
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