Conversion of Photon flux to Counts

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Hello, i am undertaking a project and need to convert photon flux (photons/cm2/s) to Counts (photons/s). I am not entirely sure where to proceed. Can anyone help?
 
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The basic idea is that you'll have to integrate the flux over the area of whatever detector or detection surface you're using. You'll have to give more specifics of the problem to go any further.
 
Ah, why the hell did i not realize that myself. Thanks a lot!
 

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