Device to be used in automatic gamma counters to move the samples into a measuring chamber

In an automatic gamma counter for measuring radioactive samples contained in sample holders removably supported in elongated racks which are moved step-by-step in a longitudinally directional path past a measuring station comprising:

• a radiation shielded chamber disposed at said station on one side of said path, said chamber having an opening facing a sample holder positioned at said station through which sample holders are to be sequentially introduced into the chamber for measuring;
• a slide fabricated of radiation shielding material mounted at said station on the opposite side of said path and facing said opening for horizontal reciprocating movement perpendicular to said path between a retracted position on the side of the path opposite from said opening and a projected position in engagement with said opening;
• said slide having a configuration to engage with said opening in said projected position to provide a radiation shielded closure for said chamber;
• and
• transferring and gripping means for removing a sample holder from a rack at said station when the slide is in said retracted position and for suspending the removed holder in said shielded chamber when in said projected position.