Abstract
A new detector system for thermal neutrons is described which employs lithium loaded glass scintillator coupled to photomultiplier (PM) tubes. It combines advantages of the previously described fibre optic coded systems [1,2] where the scintillator is coupled to PM tubes with optical fibres, and direct coupling where the scintillator is viewed directly by the PM tube. It offers one dimension position sensitivity with a resolution capability of 1 mm. Sensitivity to gamma rays, and background noise is comparable to that achieved with directly coupled systems, i.e. 10 −4, and 0.08 cm −2 min −1. Results are presented from the IRIS 2 instrument together with measurements of background and sensitivity to gamma rays.
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