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Forum: Processes Involving Optical Photons
Re: Question Questions on N06 (Yunsong Zhao)
Date: 05 Nov, 2012
From: Gumplinger Peter <Gumplinger Peter>

> 1) line 119 - 130. I know that there are fast parts and slow parts of
> scintillation, but what do the values in the arrays mean?

N06 is a novice example. It does not pretend to provide exact or realistic physical values and has a pedagogic purpose only - so there is no reference for this input. But what it shows is how you can specify two emission spectra. The fast component is a flat spectrum in the range of 2.034*eV to 4.134*eV, while the slow component has a shape (which you get if you plotted the values in ScintilSlow against PhotonEnergy. The values themselves are relative units.

> 2) line 145,146. What are the times in the sentences mean?

The emission of scintillation photons follows an exponential time constant (e**-t/tau). The fast component in this example has a short tau (1*ns) and the slow component has a tau that is 10x longer.

I should hope that this is adequately explained in the Application Developers Manual.

> PS: I am not majored in physics. Could anyone recommend some books to
> help me to understand the whole program N06?

A nice optics book I remember from grad. school is Optics by Hecht/Zajac but there may not be a whole lot about scintillation in it. Google/Wiki will get you started. You can also look at Geant4's Physics Reference Manual.

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1 Question: Re: Questions on N06   (Yunsong Zhao - 09 Nov, 2012)
(_ Feedback: Re: Questions on N06   (Gumplinger Peter - 09 Nov, 2012)
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