Abstract
Initially, Wielopolski (Wielopolskiet al. 1981) used x-rays from either a125I or a105Cd source to estimate lead (Pb) in tibial cortical bone in intact legs, post-mortem. This system utilized the Lα and Lβ x-rays of Pb with energies of 10.5 and 12.6 keV, respectively. The minimum detection limit (MDL) was considered to be comparable with existing K-line x-ray fluorescence (KXRF) instruments, namely, 20-30 ppm. The feasibility of partially polarized radiation (Barkla, 1906) was assessed from a125I source on Pb (No3)2(10,000 ppm) dissolved in wa:er. Reduction of the detector total count rate was observed by a factor of two; and reduction in background by the same factor was appaent. This preliminary study suggested that, with improved design, tlie MDL might be lowered by a factor of five (Wielopolskiet al., 1981).
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