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Forum: Processes Involving Optical Photons
Re: Question How to explain energy spectra of emmited photons from a scintillator, in my code? (Mehdi Abbasian Motlagh)
Re: Feedback Re: How to explain energy spectra of emmited photons from a scintillator, in my code? (Gumplinger Peter)
Re: Ok Re: How to explain energy spectra of emmited photons from a scintillator, in my code? (Mehdi Abbasian Motlagh)
Re: Question Re: How to explain energy spectra of emmited photons from a scintillator, in my code? (Mehdi Abbasian Motlagh)
Date: 15 May, 2012
From: Gumplinger Peter <Gumplinger Peter>

> I am using Engauge Digitizer (in Ubuntu) to do what you said. the result
> is attached.

Are you saying that:

"To test how well the program reproduces your spectrum you can histogram the scintillation photon energy the program has sampled."

e.g. that your Curve1 is actually a representation of the scintillation photon energies Geant4 has sampled?

Looks pretty good to me!

> Question: Output of the program is consist of two arrays: X and Y
> (Curve1), but we only use the X as wavelengths (or energies) in our G4
> code. How G4 can, as you said, numerically integrate only by X values?!
> For example, in the picture we have a maximum at 423 nm. Do G4
> understand "this maximum and its Y value" by only X values?

Sorry, I don't understand your issue. We have a function y=f(x), of course we can integrate it Y = integral [f(x)] dx from x0 to xn (and we can only integrate it from x0 to xn.

G4 does not have to 'understand' where the maximum is. The functional shape of the integral will be such that when sampled will more likely produce scintillation photons around that 423nm.

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1 Question: Re: How to explain energy spectra of emmited photons from a scintillator, in my code?   (Mehdi Abbasian Motlagh - 16 May, 2012)
(_ Feedback: Re: How to explain energy spectra of emmited photons from a scintillator, in my code?   (Gumplinger Peter - 16 May, 2012)
(_ Question: Re: How to explain energy spectra of emmited photons from a scintillator, in my code?   (Mehdi Abbasian Motlagh - 21 May, 2012)
(_ Feedback: Re: How to explain energy spectra of emmited photons from a scintillator, in my code?   (Gumplinger Peter - 22 May, 2012)
(_ Ok: Re: How to explain energy spectra of emmited photons from a scintillator, in my code?   (Mehdi Abbasian Motlagh - 23 May, 2012)
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