RE: [fluka-discuss]: Scoring optical photons in BGO scintillator

From: Thomas Grandsaert <>
Date: Wed, 27 Jun 2018 21:25:18 +0000

Thank you very much!!!!

-----Original Message-----
From: <> On Behalf Of Mikhail Polkovnikov <?????? ???????????>
Sent: den 27 juni 2018 12:20
Subject: Re: [fluka-discuss]: Scoring optical photons in BGO scintillator

On 25.06.2018 11:59, Thomas Grandsaert wrote:
> Dear fluka experts,
> I am trying to score optical photons in a photodiode coupled to a BGO scintillator for a wire scanner in a proton beam.
> There is also an aluminium foil reflector around the scintillator to increase the signal.
> If I run many particles, then I get a strong fluency of gammas in the scintillator, which should in theory create a shower of optical photons.
> I am getting zero signal on the photodiode, which is poorly named “fiber” in my input file.
> Could someone take a look at my input file(attached) and let me know if anything in my input file looks incorrect?
> And, if nothing is incorrect, some advice to get nonzero fluency on the photodiode?
> Finally, If I increase the number of particles to a higher number(say, 5e8), the simulation fails. (error being: aborted by kasoph-ldummy) I assume this is due to a memory error?
> Cheers and thanks in advance!
> T

Dear Thomas,

You didn't set refraction index for the scintillator material (mean value is 2.15), as well as absorption and diffusion coefficients. That gives you an optical photon generation and transport.

OPT-PROP        2.15 Bi4Ge3O1

Best regards,


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Received on Thu Jun 28 2018 - 06:35:32 CEST

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