Photomultiplier tube detector in metal housing housing (type 1529C, serial No, 359), with thallium scintillation crystal by Hilger and Watts Limited, British, 1960-1975. Commissioned by the United Kingdom Atomic Energy Authority, Harwell Photomultiplier housing type 1529C 1960-1975
Photomultiplier tube D168 (dummy) by Thorn EMI Electron Tubes Ltd., (similar to those used on Hipparcos astronomy satellite), 1984-86. Photomultiplier tube, c. 1986. 1984-1986