Radiation counter for human body - has aperture forming corridor for access of selected radiation to detector

摘要

The radiation counter utilises at least one detector for sensing radiation from a living body. The radiation counter also includes an aperture for forming a corridor between the body and the detector. A shield outside the corridor prevents passage of background radiation through the corridor and gaining access to the detector. The counter also includes a device for isolating a selected portion of the body from the corridor such that radiation counting is restricted to a region of the body. Pref. a structure supports the radiation detectors and apertures; and a device discerns radiation from the selected portion of the body isolated from the corridor.