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Question How to count optical photons in each pixel of a detector? 

Forum: Biasing and Scoring
Date: 01 May, 2015
From: Sahar <Sahar >

    Hello guys


    I am new in Geant4. I really appreciate your help in advance.


    I am simulating a CsI(Tl) scintillator and for now I have a 3*3*10 mm box of CsI. I've defined a multiple optical source inside this box, I defined 5 faces of lambertian and one face of polished.


    I am trying to count the number of optical photons that hit my detector which I've put at 130 cm under the box. I've defined a scoring mesh and I tried observing its quantity, but I think it does not give what I'm really looking for. I am not sure ( for example when the quantity is cell flux or population it doesn't make any sense to me ) , I should pixelate my detector and I want to count how many of the optical photons which were generated inside the box, hit each of the pixels.


    I have another question:

    Does anybody know how I can get these outputs?

    For example, the number of rays attenuated in a crystal, the number of rays absorbed at faces, total number of times the exit face (polished face) was hit. and such these values.

    I don't know how to define them in stepping action or maybe another class.


    Thank you,


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