I’m trying to calculate the penetration dept of the X-ray beam in my perovskite sample depending on the incidence angle. I found a tool (http://www.ccp14.ac.uk/ccp/web-mirrors/bca-spreadsheets/xrdpenetr.xls) to calculate this for my materials, but the MAC value for Iodine is missing. I performed my XRD measurements using a Cu Kα1-radiation (λ = 1.5406 Å) source.

I tried to take the mu/rho value from NIST (http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z53.html), but it looks like I shouldn’t take the value at around 8 keV (at least this doesn't match the numbers for other elements that are already in the table)

Can someone tell me what the MAC value for iodine is in this case and how to obtain this number.

http://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z53.html

http://www.ccp14.ac.uk/ccp/web-mirrors/bca-spreadsheets/xrdpenetr.xls

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