STUDIES ON THE DEPOSITION AND REMOVAL OF RADIOACTIVE SOIL1

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Abstract
The rate of deposition and removal of a radioactive milk soil from several surfaces was studied. The nature of the surface had a small but measurable effect on the rate of deposition of a radioactive milk-soil. However, the surfaces showed no significant effect on the rate of soil removal. The build-up that took place on all surfaces due to repeated soilings without washing was not a simple additive accumulation of residue but a selective deposit of a residue slowly laid down over over a period of time and difficult to remove. As the accumulated residue increased, a point was reached beyond which there was no significant difference among surfaces in the rate of soil build-up. Subsequent washing removed only part of the soil and even repeated washings had little effect unless special heavy duty cleaning was applied.

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