Abstract
Fission counters have been developed indigenously, using 233U as a sensing material for reactor startup applications. The first model has a counting sensitivity of 0.003 cps/nv in the pulse mode, 1×10−15 A/nv in the dc mode, and 6.4×10−29 A2 Hz/nv in the Campbell mode. A more sensitive counter with about 75 mg of 233U showed an average sensitivity of 0.02 cps/nv. A proposal for 233U in-core miniature dc fission chambers is discussed. A design for high sensitivity (0.5 cps/nv) U-233 pulse counter with transmission line-type readout is also proposed.
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