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Parker Deray; Anderson, Jesse I.
Health Physics: February 1967
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The routine whole-body counting program conducted during the past 5 years by personnel of the AEC Health and Safety Division at the National Reactor Testing Station has shown not only that whole-body counting is a reliable and sensitive method for the detection of internal gamma-emitting nuclides, but that portable counters with minimal shielding are both adequate and effective in many practical programs of personnel monitoring. In the past, not enough emphasis has been placed upon both the desirability and practicality of using portable whole-body counters for monitoring under conditions in which the greater sensitivity of the heavily shielded laboratory-based counter is not required and the subjects to be counted must be transported considerable distances to the counter. The present paper describes a 650-lb portable counter which has adequate sensitivity for detecting internal gamma-emitting contaminants at levels well below the maximum permissible body burdens and can be moved easily to any desired location for use. Several programs involving the use of the portable counter are reported. Methods of calibration, details of construction and attendant costs are discussed. In most cases, the large, well-shielded laboratory counter using the conventional 50-cm arc technique is only twice as sensitive as the portable counter when used in its specified manner with the bell-shaped detector in contact with the body.

©1967Health Physics Society