The detection sensitivities of 60 chemical elements in activation with the fast neutrons from an 241Am-242Cm-Be source have been measured. The source consisted of six slugs with a total output of 4.8×109 unmoderated neutrons/sec, and a flux of
1.4×108 fast neutrons/sec-cm2. In general, the sensitivity (counts in a selected photopeak per gram of target element) for each element was obtained with irradiation for two to three half-lives of the short product nuclide, and counting for the same length of time.
Neither irradiation nor counting was longer than 1 h. The detector was a cylindrical thallium-activated sodium iodide crystal 10 cm long and 10 cm in diam. The measured sensitivities are compared with reported sensitivities in activation with thermal neutrons.
Argonne National Laboratory, Argonne, Illinois 60439
Publication date: January 1, 1969
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