Abstract
Several Am-Be sources were calibrated using the manganese sulphate bath method. The sources were encapsulated in cilindrical recipients, and submerged in the center of spherical tanks with a concentra te solution of manganese sulphate in water. The measurements were made in a circulating bath using a 50 cm diameter tank and in a static bath using a 100 cm diameter tank. The neutron emmission rates were computed ~sing the measured gamma emmision rates, bath efficiency and the fraction of the total number of thermal neutrons absorbed by the manganese. Effects due to fast reactions with oxigen and sulfur, self-absorption and neutron leakage were also considered. The results obtained by the method are in good agreement with the values furnished by the manufacturer.
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