Automatic locking radioisotope camera lock

A radioisotope camera lock for locking the source isotope in a safe, shielded position in the camera when not in use is described. The lock prevents the source isotope from being moved to an operative position outside of the camera, unless intentionally released by a key and reverse movement of source pigtail. A hollow lock casing is secured to and has communication with the interior of the radioisotope camera. The source isotope is at the end of a source pigtail and is cranked or pushed from the camera and pulled back into the camera by the cranking mechanism. A stop on the source pigtail cooperates with a lock spool movably mounted in the lock casing. A lock lever pivoted in the lock casing is provided to hold the source isotope in a shielded condition within the camera upon moving the lock to its locked condition. The locking arrangement is such that the source isotope will automatically be trapped in the camera as fully withdrawn into the camera prior to manual locking. The source isotope also cannot be removed from the camera after the key and key cylinder are moved to a release position until a pulling action is applied to the source pigtail and stop by the conventional cranking mechanism