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Dissolution and Solidification of Aluminum Capsule in Production of Mo-99 by Sublimation from Neutron-Irradiated UO2
Abstract:A technique, based on the correlation analysis of signal pulses in time sequence, is proposed to determine the production rate of the pseudo multi-pulse in Geiger-Mueller (GM) counter. With a multi-channel scaler initiated by a signal pulse, subsequent pulses are recorded in sequence. The production of the multi-pulse increases the counting probability immediately after the initiation. By examining the deviation of the measured probability from the ideal counting probability, the production rate and the average lag time to produce the multi-pulse can be determined. By the use of the present technique, the production rate and the average lag time were obtained for the various GM tubes. These results indicate that the consumption of the quench gas results in a significant increase in the production rate but little variation in the lag time, and that the lag time strongly depends on the tube diameter.
Keywords:molybdenum 99  sublimation process  uranium dioxide  aluminium  capsules  dissolution  solidification  zeolite  recovery  sodium hydroxides
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