Papers: PDF OnlyServant Jean; Delapart, MoniqueHealth Physics: September 1981 - p 483-487 Buy Abstract Blood lead and lead-210 analyses were performed on blood samples from non-smoking residents of Toulouse (city of 400,000 inhabitants). Simultaneous surface soil lead content determinations were carried out by the same procedure on rural zone samples of southwestern France. The observed isotopic ratios were compared in order to evaluate food chain contamination. For an average of 19.7 ± 5.8 μg 100 cc−1 of lead in blood, atmospheric contamination amounts to 20%, estimated as follows: 6% from direct inhalation and 14% from dry deposits on vegetation absorbed as food. The natural levels carried over by the food chain reach 14.9 μg 100 cc−1 and have a 210Pb/Pb concentration ratio of 0.055 dpmμg−1. These results lead to a maximum value of 15 μg 100 cc−1 for natural lead in human blood according to the ICRP model. © Lippincott-Raven Publishers.