Evaluation of detector dead time calculation models for ICP-MS
Dead time losses lead to mass discrimination independent inaccuracies in isotope abundance ratio measurements, using pulse counting detectors in ICP-MS. These losses must be corrected for and in this work, four methods of calculating the dead time were studied using quadrupole ICP-MS. Three of the methods were based on measurements of the (204)Pb/(208)Pb isotope abundance ratio, in a set of Pb NBS-982 solutions of increasing concentration. The fourth utilised the linear correlation coefficient between analog and pulse count measurements, obtained at different dead times. An investigation of a possible mass dependence of the dead time was also made. The results of each method are critically reviewed in this paper, in terms of their accuracy, uncertainty and ease of application.
Bibliographic Reference: An article published in: Journal of Analytical Atomic Spectrometry, (2001) vol.16, pp.333-338
Record Number: 200013598 / Last updated on: 2001-07-30
Original language: en
Available languages: en