Abstract
The Hanford whole-body counter is a low-background gamma-ray spectrometer operated by the Hanford Laboratories. The shielded counting chamber approximates a 3-meter cube with shielding walls consisting of 10-inch thick steel plates. The gamma-ray detector is a large thallium-activated sodium-iodide crystal, 9 3/8 inches in diameter and 4 1/2 inches thick, viewed by four selected photomultiplier tubes of three-inch diameter. The assembly provides 8.3 per cent resolution of the 0.66 Mev gamma rays of cesium 137. The signals from the detector are transmitted to a multichannel pulse height analyzer provided with accessory electronic systems for data presentation and processing. The data accumulated in the pulse height analyzer memory are available as a visual presentation on an oscilloscope, a digital print-out of the counts per channel, a penned plot on Cartesian co-ordinates, and a punched paper tape prepared for electronic data processing. The radionuclides principally found in individuals examined in the ...
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