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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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J. A. Lonergan, D. F. Herring
Nuclear Technology | Volume 5 | Number 2 | August 1968 | Pages 79-84
Technical Paper and Note | doi.org/10.13182/NT68-A27955
Articles are hosted by Taylor and Francis Online.
A positron beam is produced and accelerated by an electron linear accelerator. The positrons annihilate in-flight when passed through a beryllium foil to produce nearly monoenergetic gamma rays with energies comparable with the positron energy and an energy spread essentially equal to the energy spread of the positron beam, i.e., 2%. Such a 10-MeV gamma-ray beam was collimated and directed at a slab of aluminum that had a thickness corresponding to one mean-free-path for 10-MeV gamma rays. The energy spectra at 0, 15, and 30° to the incident beam were measured with a NaI crystal. The results were integrated and compared with Monte Carlo calculations. The experiments and calculations agreed within the experimental uncertainty.