DE1598918

1,101,902. Measuring radio-activity. PACKARD INSTRUMENT CO. Inc. April 7, 1966 [April 13, 1965], No.15636/66. Heading G1A. Sample containers are moved to and from a well in apparatus for measuring radio-activity on a platform on an elevator shaft, the platform having a centering device for locating the container to prevent contact with the sides of the well. The invention is applied particularly to apparatus as described in Specification 1, 041, 413 where sample phials containing a scintillator are lowered successively into a cylindrical bore in a transparent member which transmits the light from the scintillations to photo-multipliers. Its object is to prevent the generation of electro- static chargers which produce spurious results. The centering device is a washer having a slightly dished central portion with upstanding arms which are urged inwardly to locate the phial when the central portion is compressed by the elevator mechanism.