Abstract
The possibility that sealed tanks coming out from nuclear plants contain special nuclear material such as plutonium is of importance for safeguard and radioprotection purposes. The estimation of the quantity of nuclear material within a suspected tank depends upon its position in the tank. Its localization using non-destruptive techniques is the aim of this paper. The tank is placed into the inner hole of a well counter provided with a ring of 3 He neutron detectors and it is oscillated around its axis. The neutrons emitted by the spontaneous fissions of the even plutonium isotopes are detected by the 3 He counters and an electronic circuitry allows recording the time sequences of the counts. The proposed method utilizes the values of the power spectra of these data at the oscillation frequency and performs a least square analysis. The procedure has been checked by means of a Monte Carlo simulation of a system containing 3 ng of 252 Cf, emitting Q 0 = 1.17 · 10 4 n/ s, in an experiment lasting 200 s.
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