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MEASUREMENT OF THE BIOTRANSFER AND TIME CONSTANT OF RADON FROM INGESTED WATER BY HUMAN BREATH ANALYSIS
Citation:
Brown, W. AND C. Hess. MEASUREMENT OF THE BIOTRANSFER AND TIME CONSTANT OF RADON FROM INGESTED WATER BY HUMAN BREATH ANALYSIS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/196 (NTIS PB92189026), 1992.
Description:
Forty-one tests were performed on 38 volunteers to measure elimination rates of 222Rn in expired breath. articipants ranged from ages 9 to 85 y, with 16 males and 22 females. he levels of physical activity of the subjects ranged from very inactive to marathon level. alibration of our flow-through scintillation cell was accomplished using a medical ventilation and 222Rn reservoir for 5-15 L min-1 flow rates. e found a wide range of percent elimination (12-68%) in 30 min. he percent elimination has a mild correlation with the predicted forced expiratory volume in 1 s and with time passed since eating. ur observations of bio-retention half-times yield a mean of 2.70 3.43 nGy Bq-1 and the stomach dose means range beyond those previously reported.
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MEASUREMENT OF THE BIOTRANSFER AND TIME CONSTANT OF RADON FROM INGESTED WATER BY HUMAN BREATH ANALYSIS