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Reply on RC1

This is an interesting and useful manuscript that presents a straightforward case for making greater use of Kr isotope measurements in certain situations in geochemistry. I think a more in-depth discussion of the geological implications would be useful but is not required for this to rise to the level of a valuable contribution, so I suggest it be accepted subject to a few minor corrections. That said, if the authors are willing to provide a longer discusison of the likely scope of applications for these methods in the earth sciences (more in Section 5.3, in particular), I think that would add to the usefulness of the paper. The results section includes a lot of material that belongs in the discussion, and I think moving this text and then expanding the discussion to look more broadly toward other applications would be appropriate for a paper that seeks to inspire others to use these techniques.