RE: Not scoring dose correctly

From: Paola Sala <>
Date: Wed, 8 Oct 2008 17:35:49 +0200

Hi Joel
The dose results are normalized to one primary particle, like all other
scored quantity.
> -----Original Message-----
> From: [mailto:owner-fluka-
>] On Behalf Of Joel DeWitt
> Sent: Tuesday, October 07, 2008 10:58 PM
> To:
> Subject: Not scoring dose correctly
> fluka-discuss:
> Before getting to my question about dose scoring, I would like to pass
> on some information regarding my earlier post
> It seems the Weaver range-energy code and FLUKA agree--within
> 2-3%--on the LET in water for the depth range of 0-30 g/cm2 of
> aluminum. Before I had just looked at the LET in some baseline
> materials (not water), and without any change in energy due to
> shielding. The placement of the primary ionization peak for 30 g/cm2
> obtained from FLUKA in my earlier post remains a mystery, as do our
> experimental results.
> As a check on my understanding of dose scoring using USRBIN and the
> generalized particle DOSE (in GeV/g), I did a short run by dosing a
> box of water with 1 nGy using 230 MeV protons. A back-of-the-envelope
> calculation gave an estimate of about 9,751 protons to deliver this
> test dose. I get instead a dose of about 0.25 pGy. The energy has to
> go somewhere, which means I'm not doing this correctly.
> Kind regards,
> Joel DeWitt
> Oklahoma State University
Received on Thu Oct 09 2008 - 10:18:29 CEST

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