Portable instrument for inspecting irradiated nuclear fuel assem

Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Fuel assay

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250362, 250391, G21C 1700, G01T 122

Patent

active

044977697

ABSTRACT:
A portable instrument for measuring induced Cerenkov radiation associated with irradiated nuclear fuel assemblies in a water-filled storage pond is disclosed. The instrument includes a photomultiplier tube and an image intensifier which are operable in parallel and simultaneously by means of a field lens assembly and an associated beam splitter. The image intensifier permits an operator to aim and focus the apparatus on a submerged fuel assembly. Once the instrument is aimed and focused, an illumination reading can be obtained with the photomultiplier tube. The instrument includes a lens cap with a carbon-14/phosphor light source for calibrating the apparatus in the field.

REFERENCES:
patent: 4389568 (1983-06-01), Dowdy
Nucl. Instr. Meth. 173, No. 2 (1980), pp. 251-257, S04700062, Nemethyl et al., "Water Cherenkov Neutrino Detector."

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