Abstract
Nondestructive assay of spontaneous fissioning nuclides like 240Pu using passive neutron counting calls for the measurement of spontaneous fission neutrons in the presence of a background of random (α, n) neutrons. Two different systems employing two different electronic techniques, the conventional coincidence and the shift register technique, have been fabricated to carry out coincidence measurements with thermalized neutrons. The paper summarises the results of a comparative study of the performance of the two systems and establishes the superiority of the shift register technique. The limitation of the method in the assay of 240Pu is shown to arise from the effect of neutron multiplication.
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