Optical joint for horizontal mounting of a large scintillation crystal

Abstract

>The preparation of the optical contuct was carried out as follows. A thin layer of silicone oil was spread on the contact surfaces and an O-ring was placed in position. A press fit was made between the contact surfaces while tbe crystal-phototube unit was maintained in a vertical position. The latex band was snapped into position and the edges fastened to the crystal and the photomultiplier with electrical tape. The assembly was placed in the spectrometer chassis and a constant pressure exerted between the crystal and the phototube by means of a clamping device. A small hole was cut in the uppermost surface of the latex band and silicone oil poured in until the space between the crystal and the phototube was completely filled. This arrangement has shown no leakage over a six-month period and the optical contact efficiency has remained substantially the same. (D.E.B.)