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Ultra Low Noise Multiple Isotopx Ion Counting (IIC) and Faraday Detectors on Phoenix TIMS
Technical Note 2101 Matt Hockley, Zenon Palacz, Shaun Yardley and Tony Jones, Isotopx Ltd, Middlewich, Cheshire, UK. Introduction When measuring very small ion signals (<10,000cps), in sub picogram samples of actinides, ion counting detectors are necessary due to their low noise compared to that of a Faraday detector. Ion counters however, still have a nonzero…
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Phoenix – Thermal Ionization Mass Spectrometer
World class heritage and knowledge. Isotopx are the TIMS specialists. Isotopx was formed in February 2008 as a Management buyout (MBO) from GV instruments. The BO was in response to Thermo Corporation’s purchase of GV instruments and the subsequent enquiry by the UK Competition Commission into the purchase. We trace our heritage to the very…
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U-Pb TIMS Geochronology using ATONA® Amplifiers
Dawid Szymanowski & Blair Schoene Department of Geosciences, Princeton University; dszymanowski@princeton.edu; bschoene@princeton.edu V11D-0124 Key Points ATONA [aA (10-18 A) to nA (10-9 A)] is a new Faraday cup signal amplifying technology for Isotopx Phoenix thermal ionisation mass spectrometers (TIMS) Main advantages for TIMS U–Pb geochronology (compared to conventional ion counting with peak-hopping): Better precision and…
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NGX-600 Noble Gass Mass Spectrometer
Noble Gas Mass Spectrometry is used to study the isotopic composition of the noble gas group of elements – helium (He), argon (Ar), krypton (Kr), neon (Ne), xenon (Xe). They can be used for dating e.g. Argon isotopes, or as isotopic tracers in earth and cosmochemical evolution. The NGX-600 mass spectrometer from Isotopx is the…
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DG60 High Performance Filament Degassing Unit with Advanced Automation
Overview The Isotopx DG60 is a floor standing, self contained filament degassing unit capable of automatically preparing up to 60 TIMS filaments per cycle. The most advanced software control of any commercially available TIMS degasser. Filaments split into banks of 10, each with its own degassing method consisting of multiple ramp and hold steps. No…
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An assessment of the linearity of the ion-counting Daly detector and Hamamatsu photomultiplier using NBS U500
The Daly detector was designed by N.R Daly in the 1960’s . The design uses a conversion dynode to convert incident ions into electrons. It also separates the multiplication electronics away from the ion beam preventing secondary ion production on the multiplication dynodes. The conversion surface is a highly polished, aluminised metal surface that is…
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Total evaporation analysis (TE) of 500ng loads of U500 using Phoenix TIMS – Precision and Efficiency.
Introduction Uranium does not have a stable isotope pair that can be used to correct for mass fractionation in a TIMS. Measurements have to be made using external mass fractionation control or by total evaporation of the sample and simultaneous (static) collection of all isotopes. Addition of a doubly enriched isotope spike e.g. 233U and…
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High precision isotope ratio measurements of Sr and Nd at the nanogram level using the Phoenix TIMS with next generation Faraday detectors
Zenon Palacz What are the parameters required for high precision measurements of small samples? (on Faraday collectors) High Sensitivity Instrument sensitivity Use of activators Low noise Close to theoretical Johnson noise Baseline stability Gain stability between detectors Required for static analyses Multidynamic measurements: Eliminates gain and efficiencies But can it be used on small samples?…
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Phoenix Site Planning Guide
The purpose of this site planning guide is to provide users with specific information regarding the instrument requirements to allow adequate site preparation. This site planning guide will enable our users to prepare their laboratory with the necessary services and minimise any possible delays. The Phoenix TIMS is a high precision electronic instrument whose performance…