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Question Energy deposited by secondaries not adding up 

Forum: Biasing and Scoring
Date: Jan 18, 02:42
From: <fceraudo>

Hello everyone,

I am trying to track all the particles generated by incoming X-ray photons in a silicon detector. An hit is registered in the hit collection at every step and for every particle (event ID, position, deposited energy, particle type...). The geometry is very simple: just a piece of Si in vacuum, thick enough to ensure the total absorption of the primary photons. The physics list I use is Shielding_EMZ. The production threshold (cut) is down to 1 um.

If I shoot a 10 keV photon (the value is just an example), it is absorbed and produces a bunch of electrons, as expected: the energy deposited by all the particles, if summed up, gets 10 keV. Nothing strange here.

If I increase the number to 10 primaries, again nothing out of the ordinary. At 100 primary photons, however, I start seeing things like 99 events depositing 10 keV and 1 event depositing 3 keV, which looks a bit worrisome. At 10k primaries (all of which having 10 keV), I get a continuous distribution from 0 to 33 keV peaked at 9 keV.

Any thoughts explaining the reason for this?

Thank you very much.

Francesco

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1 None: Re: Energy deposited by secondaries not adding up   (michel maire - Jan 18, 06:35)
(_ Question: Re: Energy deposited by secondaries not adding up   (fceraudo - Jan 18, 09:25)
(_ None: Re: Energy deposited by secondaries not adding up   (michel maire - Jan 18, 10:40)
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