A commentary on in vivo lead X-ray fluorescence with reference to the 1992 workshop.

One of the main purposes of this Commentary is to respond to some of the issues raised in a Summary by Todd et al. (1993) of the 1992 Workshop sponsored by the National Institute of Environmental Health Sciences on X-Ray Fluorescence (XRF), as it contains apparently undocumented claims for K-Line XRF (KXRF) techniques and understates the efficacy and clinical research results of the L-Line XRF (LXRF) technique (Rosen et al., 1989; Rosen et al., 1991). This Commentary presents a point of view concerning the Workshop that is different in several respects from that published by Todd, Landrigan and Bloch (Todd et al., 1993)