energy absorption coefficients

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I am working in the field of Radiotherapy using G4.
  I have a technical problem in accessing information in G4
  that I don't know how to resolve it. 
  The question concerns the fact of how to access the photon 
  interaction coefficients in G4. 
  In our study we use variance reduction techniques to estimate kerma 
  in water. For this study we need the energy absorption coefficients 
  mu_en.
  Do you know how can we obtain this data in G4?

  Thanks in advance.
  --