摘要: Abstract The relation between uptake of lead and the level in blood (PbB) is curvilinear, but it not certain whether this true for all levels intake, or only when PbB exceeds some value. Volunteers have been exposed to enhanced air (PbA) epidemiological studies PbA made. From these, slope curve vs can be estimated. Tracer experiments using radioactive stable isotopes used derive contribution PbB. Because response fractional greater than curve.