Abstract
This paper describes a mathematical model for determining 222Ra body burdens from measurements of 222Rn in the breath. The model permits investigators to distinguish between that portion of radon in the breath due to a radium body burden and that due to release of atmospheric radon from the body. The radium body burden is determined from the radon content of three breath samples taken during a limited acclimation period in an atmosphere of known, low-radon concentration. This method makes it unnecessary for the subject to reach full equilibrium with the low-radon atmosphere and eliminates the need for a correction factor to account for release of residual atmospheric radon in the breath. The effect of breathing rate on the release of previously inhaled atmospheric radon from the body is discussed.
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