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Whole-Body Counting Studies Using Cesium-132^1,4,

Washington, D.C.

ABSTRACT

Cesium-137 detection efficiencies obtained for the "one-meter arc" and "tilting chair" geometries suggest a dependence on W/H (weight divided by height).

The radiocesium average biological half-time of 62.2 days obtained, was in agreement with previously published values.

Results of the "one-meter arc" geometry showed that 92 per cent of the injected dose was retained, which agreed with the fraction collected in the urine. A material balance on the "tilting chair" geometry suggested only 75 per cent of the injected dose was retained. This disagreement was assumed to be due to redistribution in the body after injection which altered the "chair" detection efficiencies. Corrections were, therefore, made in the detection efficiencies for the "tilting chair" so that in the future accurate cesium-137 body burdens could be obtained on subjects whose cesium body burdens were in equilibrium.

FOOTNOTES

¹ This study was completed in connection with outside of service training in radiological health at the University of California, Berkeley, California.

⁴ This investigation was supported by a United States Atomic Energy Commission Research Grant and the U. S. Public Health Service.

² A Sanitary Engineer with the Division of Radiological Health, United States Public Health Service, United States Department of Health, Education and Welfare, Washington, D.C. 20002.

³ Donner Laboratory of Medical Physics and Biophysics, University of California, Berkeley, California.