Thallium Isotope Materials
Values of δ205Tl in terrestrial materials cover an interval of no more than 2 ‰, which is large when considering the relative mass difference between the two isotopes of thallium. Before the widespread use of multi-collector ICP-MS, the main interest in thallium-isotope studies was the search for anomalies in the 205Tl abundance in meteorites due to the decay of the now-extinct 205Pb isotope.
|NRC SRM 997||elemental Tl||0 ‰ *|
|ERM-AE649||nitrate solution||0.0(6) ‰|
|NRC NASS-5||seawater||-0.5(1) ‰|
* Exact value defining the δ205TlSRM997 scale.
Values in parenthesis are expanded (k = 2) uncertainties applicable to the last digits. The values listed in this table are compilation and are not necessarily CIAAW recommendations.