Postprandial Changes in the Exhalation Rate of Radon Produced in Vivo

Abstract

The rate of exhalation of radon by persons with long-standing radium burdens increases about twofold shortly after a meal. The increase is short-lived and "normal" values are regained in 1.5 to 2 hours. The effect may account in part for the poor reproducibility in estimates of the freely emanating part of the radium content.

Direct total body214Bi measurements and their implications for radon dose assessment

“…More specifically: (a) 80% either studied or worked at UIC, (b) their dwellings (with few exceptions, few-story cement/brick buildings heated by water-based centralheating systems) were close to IUC and (c) they spent less than 30 min outdoors before counting. In addition, subjects who had previously been exposed to unsealed radioactive sources, subjects who had recently carried out activities that could modify their TBBi levels, such as intensive physical exercise or the consumption of a heavy meal, and subjects who had made recent visits to closed spaces with known high radon levels, were excluded from the study (Rundo et al 1978, Lykken et al 1983, Stebbings and Dignam 1988, Martin Sanchez et al 2013.…”