Patent ID: 7608831

Claim:
A radioactivity dose calibrator comprising: a transportable radiation shield-container comprising radiation-absorbing material, having a reference axis centered on a corresponding bore cavity for receiving a vial or syringe containing radioactive material, the walls of said shield-container absorbing radiation emitted by said radioactive material, said shield-container having first and second removable end portions, thereby allowing radiation emitted by said radioactive material to be directed substantially along said reference axis in two directions; first and second radiation detectors disposed on said reference axis, and located a pre-determined distance apart and facing adjacent respective first and second open ends of said radiation shield-container, wherein said first and second detectors are responsive to radiation emitted by the radioactive material, and provide first and second output signals respectively representing the amount of radiation received by said first and second detectors from the radioactive material; a signal processing circuit coupled to said first and second detectors for comparing the sum of said first and second output signals with a reference signal level and providing a third output signal representing a calibrated level of radioactivity emitted by the radioactive material; and display means coupled to said signal processing circuit and responsive to said third output signal for providing a visual indication of the calibrated level of radioactivity emitted by the radioactive material.