I wonder if others have experienced low H3 factors on a Delta V. The H3 factor on this instrument used to range from 5-7, but is now around 3. The filament was recently changed, and the box/trap is 0.91/0.59. The reactor was just replaced and conditioned and backgrounds donít suggest a leak. We see good reproducibility between runs with the alkane standard Mix A5, but the difference between expected and measured values ranges over ~40 permil.
If others have insight into the cause of a low H3 factor, any help would be much appreciated.
Department of Geology
University of Cincinnati