We are using Monte Carlo methods to model X-ray transport through materials. The code requires 4 optical properties for each material: absorption coeff (mu_a), scattering coeff (mu_s), real-refractive index (n_r), and anisotropy (g). The first 3 properties can be calculated using online databases such as XCOM and XOP. However, I have not been able to find references for the anisotropy, especially in the X-ray regime. Alternatively, anisotropy can be determined if the reduced scattering coefficient (mu_s') is known: mu_s' = (1-g)*mu_s.
http://physics.nist.gov/PhysRefData/Xcom/html/xcom1.html
https://www1.aps.anl.gov/Science/Scientific-Software/XOP
Dear friend, very interesting question. I am interested to your question and will explain in detail soon (similar to my case). A bit hurry for this time, please remind me.
However, the easiest way is searching the related document by typing the keywords into google scholar. You will find some related articles.
If yet to find the articles, do not hesitate to let me know. InsyaALLAH I will help you in detail.
Good luck. Dr Zol Bahri - Universiti Malaysia Perlis
Thanks for your answer Zol. I did a search in Scholar before I posted this question, but did not have much luck in the X-ray regime. I should mention that the materials we are trying to model are biological - specifically, soft tissue such as muscle, skin, fat, cardiac, etc.
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