common 206Pb proportion

shiqianghuang

Hello Iolite Team,

I have a question regarding the calculation of common 206Pb proportion (common 206Pb in total 206Pb).
I found that if I calculate the 208Pb correction in VisualAge in Visualization in the tool bar, there will be an intermediate channal called f206 (208Pb-corr) being created. I wonder if this is the common 206Pb proportion?
Does Iolite calculate this value using the equation below?

Thanks for your help!

Cheers,
Shiqiang

Joe

shiqianghuang

For the UComPbine DRS and the 208-correction done afterwards via the menu, it is assumed no Th. So, f206 = (208/206_measured)/(208/206_common). It would be easy enough to include the Th. If you have a good example dataset where this is applicable, would you mind sharing it with support@iolite-software.com?

Many thanks and all the best,

Joe

Thank you for sharing your data. I've expanded the 208Pb correction for the DRS and the correction done post-DRS to allow for Th. This should be included in the next release of iolite (4.9.2).

All the best,