Apparatus for measuring the radioactivity of the contents of tube like receptacles

Apparatus for measuring the radioactivity of the contents of a plurality of receptacles comprising, in combination,

• a. horizontally disposed support member having a plurality of peripherally arranged apertures for removeably supporting a plurality of downwardly extending elongated receptacles for containing radioactive material
• b. vertically oriented rotatable and reciprocally vertically moveable shaft member engaged to said support member for rotating said support member and for lowering and raising said supporrt member
• c. a cam member in engagement with said shaft member to cyclically lower and raise said shaft member and said support member a predetermined distance upon rotation of said cam member
• d. a plurality of probes for receiving said elongated receptacles supported by said support member and for measuring the radioactivity thereof said probes being arranged below a selected number of said rceptacles in alignment with said selected receptacles
• e. a geneva drive means in engagement with said shaft member to incrementally rotate said shaft member and said support member an amount which aligns receptacles other than said selected receptacles with said probes
• f. drive motor means in engagement with said cam means and said geneva drive means to
• i. rotate said cam means and cyclically lower said shaft member a predetermined distance and cause said elongated receptacles to be received by said probes and thereafter raise said shaft member to return said elongated receptacles to their initial position
• ii. rotate said geneva drive means to incrementally rotate said shaft member and said elongated receptacles upon return to their initial raised position
• g. electrical switching means arranged to be actuated upon the lowering of said shaft member said predetermined distance to deenergize said drive motor for a predetermined period after said receptacles have been received by said probes.