Fluorescence Problem

Dear Experts Please see the attached Screen Shots:

I tried to pass the photons directly to the germanium crystal (see the attached image).

When I expose the photons to germanium directly, I can see some scattering. However, with the sample, the tracks just pass by without any fluorescence.

Am I doing something wrong in definition of sample material?

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Have you included optical physics in your physics list? Have you defined flourescence in your sample? Have you given indices of refraction for your sample and other materials?

There is not enough information here.