Abstract
If a whole-body counter is to be used for clinical measurements, it is very important that the count obtained shall be essentially independent of the distribution of a given total activity within the patient. A system fulfilling this requirement has been described (Warner and Oliver, 1966). This makes use of two collimated scintillation counters (with sodium iodide crystals 4 in. diameter and 3 in. thick), mounted one above and the other below a motor-driven couch. Further lead protection around the detectors provides a so-called “shadow-shield”, and the total “traverse” count is recorded as the patient is scanned through the counting region of about 8 in. It is of interest to consider the contribution of the various design features of this system in providing the required spatial uniformity of response. For a single detector the count rate with a small radioactive source in air will, to a close approximation, vary inversely with the square of the sourcedetector distance. In Fig. 1 curve AOB shows this th...
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