[Ifeffit] Hephaestus ion chamber absorption

[George Sterbinsky]

Hello,

Can anyone explain why the values given by the ion chamber utility in
Hephaestus differ from those given for a 10 cm He filled ion chamber in
figure 3.14 of Grant Bunker's Intro to XAFS book at high energy? For
instance, figure 3.14 indicates an absorption fraction of ~3E-7 at 40 keV,
whereas Hephaestus indicates 2E-4 at the same energy.

Thank you,
George
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