Description: A two-stage absolute counting facility for large liquid samples of aqueous Mn/sup 56/SO/sub 4/, primarily intended for better than 1% precision measurements of neutron source strengths by the manganese bath technique, is described. Two-liter samples are counted in a gamma - gamma coincidence arrangement that greatly improves long-term reproducibility at some sacrifice in counting statistics; this sacrifice is, however, lessened through a novel pulse- distribution scheme that allows fall utilization of the output of each detector channel. The system is calibrated on an absolute scale through another unit which counts aliquots of strongly activated samples mixed with liquid scintillator in a 4 pi BETA / gamma coincidence mode. The entire facility is designed to be readily adaptable to other radioisotope-counting requirements. (auth)
Date: August 1, 1963
Creator: DeVolpi, A.; Porges, K.G.A. & Larsen, R.N.
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