Re: USRBIN, DOSE: Which units are used to express scored absorbed dose?

From: Alberto Fasso' <fasso_at_slac.stanford.edu>
Date: Thu, 7 Oct 2010 11:59:04 -0700 (PDT)

  
Dear Alexandr,

doses are expressed in GeV/g per unit primary weight.
Thank you for spotting the error in the manual.

Alberto

On Sat, 2 Oct 2010, Alexandr Malusek wrote:

> Dear FLUKA users,
>
> Which units are used to express scored absorbed dose? The documentation says:
>
>> Energy deposition will be expressed in GeV per cm3 per unit primary weight.
>> Doses will be expressed in Gy per unit primary weight.
>
> I use USRBIN and DOSE to score absorbed dose in a water phantom, see the following cards:
>
> USRBIN 11. DOSE -40. 80.0 0.0 30.0Dose
> USRBIN 0.0 0.0 0.0 160. 1. 60.&
>
> The value reported by FLUKA for the surface of the water phantom is 5.92283905e-3. The scoring was performed for protons with kinetic energy of 0.2 GeV in a cylinder with radius r = 0.5 cm and height h = 0.5cm. A simple estimate of the absorbed dose based on the mass stopping power Sm(0.2 GeV) = 4.492 MeV cm^2/g gives:
>
> D = energy_imparted / mass = (Sm * h * rho) / (pi * r^2 * h * rho) = Sm / (pi *r^2) = 5.72e-3 GeV/g = 9.15e-10 Gy.
>
> The value reported by FLUKA is similar to the estimate expressed in GeV/g, but the fluka2008.manual says that doses are expressed in Gy. I'm confused.
>
> Regards,
> Alexandr
> --
> Alexandr Malusek
> Department of Medical and Health Sciences
> Division of Radiological Sciences / Radiation Physics
> Faculty of Health Sciences
> SE-581 85 Linkping
> Sweden
>
>

-- 
Alberto Fasso`
SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
Phone: (1 650) 926 4762   Fax: (1 650) 926 3569
fasso_at_slac.stanford.edu
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Received on Fri Oct 08 2010 - 08:36:09 CEST

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