Performance appraisals of digital spectroscopy systems for the measurement of bone lead

The performances of two new digital spectroscopy systems are compared to a conventional analogue amplifier ADC system for the 109Cd based K X-ray fluorescence in vivo measurement of bone lead. Canberra’s DSA-2000 and ORTEC’s DSPECPLUS were found to show 27.3 and 10.8% improvements in measurement precision respectively, when compared to an optimized conventional system. The resulting improvements in minimum detection limit, compared with the conventional limit of 6–10 μg Pb/g bone mineral, were reductions of 1.5–2.5 μg Pb/g bone mineral for the DSA-2000, and 0.5–1.0 μg Pb/g bone mineral for the DSPECPLUS.