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Forum: Processes Involving Optical Photons
Re: Question Scintillation rise time (Martin Goettlich)
Re: Feedback Re: Scintillation rise time (Gumplinger Peter)
Re: None Re: Scintillation rise time (Martin Goettlich)
Date: 12 Oct, 2010
From: Michael <Michael>

Hi guys,

I've been using the geant4_9_4 beta that was released a few months ago which has the implimentation of the Martin's equation in it.

In Martin's equation, if tau_d and tau_r are the decay and rise times respectively, then there is a missing factor of ln(2), is there not? If you supply a fall time of 1.3 ns (BC-422) you don't get a 1.3 ns decay when you plot Martin's equation. However, if you plot

(exp(-ln(2)*t/td)*(1-exp(-ln(2)*t/tr))

you will get the expected result.

Incidentally in detector geometry when defining rise and fall time you must supply tr/ln(2) and td/ln(2) to get the required result. This has caused me some pain...!

Peter, could the G4Scintillation.cc be updated with the factor of ln(2) so the rise and fall can be supplied instead?

Mike.

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1 Idea: Re: Scintillation rise time   (Michael - 13 Oct, 2010)
(_ None: Re: Scintillation rise time   (Michael - 15 Oct, 2010)
1 Warning: Re: Scintillation rise time   (Martin Goettlich - 29 Oct, 2010)
1 Feedback: Re: Scintillation rise time   (Michael - 29 Oct, 2010)
... 1 Message(s)
2 Question: Re: Scintillation rise time   (Qiang - 10 Mar, 2016)
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