Description: Neutron activation rates are calculated from measured gamma-ray spectral data obtained from calibrated lithium drifted germanium (Ge(Li)) detectors. The calibration techniques, which include energy, efficiency, pulse height analyzer data reduction, and geometry factors, are discussed. Problems encountered when analyzing highly radioactive samples, specifically random coincidence summing, sample size, air absorption, and use of absorbers, are also discussed briefly. To illustrate the accuracy achievable, the reduction of gamma-ray spectral data and the calculation of reaction rates by three independent laboratories are presented for both fission and nonfission foils to a precision of +-1 to 2% (1sigma). The application of these neutron activation rates to neutron dosimetry is discussed. An unfolded neutron spectrum is illustrated, along with energy sensitivity limits for many reactions of dosimetry interest.
Date: January 1, 1979
Creator: Malewicki, R.L.; Heinrich, R.R. & Popek, R.J.
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