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Abstract No.: ThP-154
Session: Materials Science
Presentation date: Thu, Aug 31, 2006
Presentation time: 14:30 – 16:00

Lithium Isotope Ratio Determination by Mass Spectrometer and Investigating Effects of Various Parameters on Precision

Afsaneh Ahmadi1, Ehsan Ziaei1

1 Atomic Energy Organization of Iran, Tehran, Iran*

Correspondence address: Afsaneh Ahmadi, Atomic Energy Organization of Iran, physical chemistry, nuclear research center, end of north kargar, Tehran, 1439951113 Iran.

Keywords: Ionization, Thermal; Isotope, Stable; Mass Discrimination; Mass Spectrometry, Isotope Ratio.

Novel aspect: Ability of lithium isotopic analysis of natural and enriched samples by mass spectrometer MAT-260 to broden its application.


Feasibility of Lithium isotopes ratio measurements by mass spectrometer (MAT-260) to broaden its application to include light elemnts was investigated. As the first element to be studied, Li was selected because of its uses in nuclear technology. The relative mass difference between two isotopes of Lithium is large, over 14%, therefore isotope fractionation limits the accuracy and precision of isotopic measurements. Isotope fractionation depends on chemical form of the sample, sample loading, filaments temperature and heating pattern. Our investigation showed among the various Li compounds, LiNO3 is the most proper chemical form to use and this is due to its low melting point, its high dissociation point and its suitable vapor pressure. After selecting the right compound, the most effective parameters on the measurements were investigated and optimized. Our measurements showed by choosing right parameters, it would be possible to measure Li isotopes ratio with resolving power of 420 and precision of 0.1% with this mass spectrometer.