公开(公告)号：US3609371A

公开(公告)日：1971-09-28

申请号：US3609371D

申请日：1968-06-11

Applicant: INTERTECHINIQUE SA

Inventor： JACOB JEAN CLAUDE

IPC: G01T1/204 ,  G01T7/08

CPC classification number: G01T1/204 ,  Y10T74/18256

Abstract: A mechanism for positioning a standard gamma emitter for use as an external standard in a liquid scintillation spectrometer as adapted to move the emitter between a shielded position in a metal body and an operative position close to a sample to be standardized. The mechanism comprises a rotatable disk, an arm carrying the emitter and connected to a motor by a driving mechanism which successively moves the emitter radially inward with respect to the disk, along a part circular path along with the disk and radially outward upon energization of the motor.