Abstract
Measurements have been made of the activation, by fast neutron irradiation, of a dilute aqueous solution of sodium nitrate contained in man phantoms. Phantom shapes included a cylinder 30 cm in diameter, a slab 30 cm thick and an approximately man-shaped phantom. Monoenergetic neutrons were used, at energies of 0·2, 0·5, 2·5 and 6·2 MeV. From these measurements the neutron capture probability in a man may be determined for use in dose assessment after a criticality accident. A representative value of about 0·4 was obtained.The results for neutron capture, derived from sodium activation for both cylinder and slab, are compared with values appearing in the literature. Agreement is found with the work of Hurst and Ritchie but not with the work of Snyder or of Kogan et al.
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