Abstract
The energetic gamma-ray spectra from the fission products of photofission have been investigated to determine whether photofission can identify heavily shielded fissionable material. Target samples of natural thorium, 93% enriched 235U, natural uranium, and 93% enriched 239Pu were irradiated with bremsstrahlung gamma rays produced by 10-MeV electrons from a small linear accelerator. The gamma-ray spectra for each of the four isotopes studied reveal a distinctive intensity distribution. For example, the intensity ratio of the pair of gamma rays at 1436 keV ( 138Cs) and 1428 keV ( 94Sr) is 1.9 for 235U, 2.4 for 238U, 1.7 for 232Th and 1.4 for 239Pu.
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Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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