fission chamber

fission chamber

[′fish·ən ‚chām·bər]
(nucleonics)
An ionization chamber used to detect slow neutrons; the inside wall has a thin coating of uranium, in which a slow neutron produces a fission; the resulting highly ionizing fission fragments produce a count in the chamber. Also known as fission counter.
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The gamma radiations from the fission would also be comparatively low and since the fission chamber is closed except on the nozzle portions, there occurs loss of energy of many gamma radiations by collision with the wall of the chamber.