Wieser, MichaelMayer, Adam John2012-10-032012-11-132012-10-032012http://hdl.handle.net/11023/261Analytical techniques have been developed for measuring the absolute isotopic composition of molybdenum reference materials using multiple collector inductively coupled plasma mass spectrometry. A correction for instrumental mass bias was performed using a molybdenum double-spike prepared from gravimetric mixtures of 92Mo and 98Mo isotope spikes. Careful assessments of laboratory procedures and data were performed to analyze possible impacts on the nal results. The absolute isotopic composition of the SCP Science - PlasmaCal molybdenum reference material was determined to be: 92Mo=14.626(17), 94Mo=9.182(5), 95Mo=15.869(5), 96Mo=16.67(3), 97Mo=9.585(3), 98Mo=24.308(14), and 100Mo=9.758(11). The atomic weight of molybdenum in PlasmaCal was calculated as Ar=95.9508(16). Delta values (reported as 98=85Mo relative to PlasmaCal) were determined for: NIST SRM-3134, +0.37(14)‰; Johnson-Matthey pure molybdenum rod, -0.32(14)‰; BCR-2, +0.28(14)‰; and SDO-1, +1.5(5)‰. The total natural variation of molybdenum of -1.5‰ to +3‰ results in a calculated atomic weight of Ar=[95.948, 95.956].engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.PhysicsPhysics--Nuclearatomic weightMolybdenumisotopic compositionMC-ICP-MSmaster thesis10.11575/PRISM/26849