# Re: USRBIN, DOSE: Which units are used to express scored

Date: Fri, 8 Oct 2010 08:00:29 +0200

absorbed dose?
From: "Paola Sala" <paola.sala_at_mi.infn.it>
Date: Thu, October 7, 2010 4:00 pm
To: "Alexandr Malusek" <alexandr.malusek_at_liu.se>
Cc: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
--------------------------------------------------------------------------
Sender: owner-fluka-discuss_at_mi.infn.it

OOPS!
The manual is wrong. Dose is scored in GeV/g .
Indeed, the manual is also inconsistent, it gives two different units in
the description of the DOSE generalized particle vs the description of
USRBIN
Thank you for pointing this out, and sorry for the mistake
Paola

> 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
> Faculty of Health Sciences
> Sweden
>
>

Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148

Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
Received on Fri Oct 08 2010 - 08:30:16 CEST

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