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Forum: Processes Involving Optical Photons
Re: Question Optical Photons not getting reflected from Auminium. (Ashwath Rao)
Re: Feedback Re: Optical Photons not getting reflected from Auminium. (Ashwath Rao)
Re: Feedback Re: Optical Photons not getting reflected from Auminium. (Athreya Shankar)
Date: 29 Apr, 2012
From: Ashwath Rao <Ashwath Rao>

hi Athreya,
   Thank you for your timely reply. I tried using the UNIFIED model. There is noticeable change, but still the compton region is not clear enough. Also I understood your point about the compton region. 

Well I am attaching a histogram plot of sum of photon energies per gamma event. its with a 2"x2" crystal.
   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/04/28/23.56-56228-2by2inch.jpeg

Also through the link of your previous post I tried to reduce my crystal dimensions to 1"x0.5". This helped in increasing the lower region counts (though not majorly). Its in the following attachment.

      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/04/29/00.01-50358-1by0.5inch.jpeg

When using both i.e. the G4LowEnergyCompton + G4LowEnergyPhotoElectric and G4ComptonScattering + G4PhotoElectricEffect it gives a bad histogram.

Doubts: 1) Is it necessary to give a reflective material (like MgO) layer in between the NaI(Tl) and Aluminium casing ? If YES then do we specify a trade-off between the REFLECTIVITY and EFFICIENCY values for MgO ?

2) Which Histogram plotting method do you use? I am using an online Histogram Plotter ( http://www.wessa.net/histo.wasp )

Thank You.

Regards,

Ashwath.

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1 Feedback: Re: Optical Photons not getting reflected from Auminium.   (Athreya Shankar - 04 May, 2012)
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