High precision uranium, thorium and radium isotope ratio measurements by high dynamic range thermal ionisation mass spectrometry

Mass spectrometric methods are presented for the precise determination of the isotopic compositions of uranium, thorium and radium. M + ions were produced by thermal ionisation. Analysis involved either a dynamic routine using the Daly detector or a static routine employing both the Daly detector an...

Full description

Saved in:
Bibliographic Details
Published in:International journal of mass spectrometry and ion processes 1992-07, Vol.116 (1), p.71-81
Main Authors: Cohen, Anthony S., Belshaw, Nicholas S., O'Nions, R.Keith
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
isotope ratio
radium
Spectrometric and optical methods
thermal ionisation
thorium
uranium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Mass spectrometric methods are presented for the precise determination of the isotopic compositions of uranium, thorium and radium. M + ions were produced by thermal ionisation. Analysis involved either a dynamic routine using the Daly detector or a static routine employing both the Daly detector and off-axis Faraday detectors. Instrument performance was assessed using a set of uranium standards, CBNM IRM 072. The response of the Daly detector was linear up to ratios of at least 5 × 10 4 and when operated dynamically it is ideally suited to the measurement of ion beams in the range 5–1 × 10 5 cps. The static mode of analysis was employed successfully for the measurement of isotope ratios up to 5 × 10 5.
ISSN:0168-1176
1873-2801
DOI:10.1016/0168-1176(92)80020-2