Multi-collector Isotope Ratio Mass Spectrometer -- Operational Performance Report

Appelhans, Anthony D ; Olson, John E ; Watrous, Matthew G ; Ward, Michael B. ; Dahl, David A.

关键词: COLUMBIA RIVER;    DETECTION;    DYNODES;    ELECTRON MULTIPLIERS;    ISOTOPE RATIO;    MASS SPECTROMETERS;    PERFORMANCE;    RESINS;    SEDIMENTS;    TESTING isotope ratio;    mass spectrometer;   

DOI  :  10.2172/1009151
RP-ID  :  INL/EXT-10-20664
PID  :  OSTI ID: 1009151
Others  :  TRN: US1101736

美国|英语

来源: SciTech Connect

【 摘 要 】

This report describes the operational testing of a new magnetic sector mass spectrometer that utilizes seven full-sized discrete dynode electron multipliers operating simultaneously. The instrument includes a newly developed ion dispersion lens that enables the mass dispersed individual isotope beams to be separated sufficiently to allow a full-sized discrete dynode pulse counting multiplier to be used to measure each isotope beam. The performance of the instrument was measured using SRM 996 (244Pu spike) at loadings of 2.4 and 12 fg on resin beads and with SRM 4350B Columbia River Sediment samples. The measured limit of detection (3s) for 240Pu was 3.4 attograms for SRM 996. The limit of quantitation (LOQ), defined as 10 s, was 11.2 attograms. The measured concentration of 239Pu in the CRS standard was 152 ?? 6 fg/g.