The Development and Performance of a Prototype Shadow-Shield Whole Body Monitor

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Abstract
A shadow-shield whole body monitor has been developed which is capable of high sensitivity at low cost and which is of suitable design for incorporation in a mobile laboratory. The stages of development and the performance of the final prototype are described so that the shielding requirements and crystal volume can be estimated approximately for a required sensitivity. The prototype, using a 3 in. diameterx3 in. high sodium iodide detector, has a sensitivity, or minimum detectable activity for iron-49 and cobalt-58 of approximately 4 x 10-3[mu]o. With a detector 11 1/2 in. diameter x4 in, it is shown that sensitivities comparable with steel-room monitors can be expected. The variation In counting-rate due to redistribution of the isotope in the patient''s body has been examined.

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