RE: Advanced sources

Dear Sunil,

for ISOTOPE as BEAM particle, the direction of the primary is totally
pointless, since we are just dealing with a decaying nucleus at rest. So
discussing about isotropic distribution is unrelevant.
As for the spatial distribution of the newly available extended sources,
it is uniform. Note that you are subtracting from the outer cylinder an
inner cylinder of zero radius and 0.6mm height, which makes no sense.

Cheers

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Thu, 28 Apr 2011, Santana, Mario wrote:

> Sujoy,
>
> The definition of the beam position / shape through the BEAMPOSit card is
> independent of the definition of the starting direction of the particles.
> Note that FLOOD produces an isotropic fluence at a sphere which is
> different from sampling isotropic particles uniformly within a sphere.
>
> You can define isotropic emission by setting WHAT(3) of the BEAM card >
> 2000 x PI mrad
>
> Mario
>
> -----Original Message-----
> From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it=
> ] On Behalf Of sujoy_at_veccal.ernet.in
> Sent: Monday, April 18, 2011 4:40 AM
> To: fluka-discuss_at_fluka.org
> Subject: Advanced sources
>
> Dear Fluka users,
> this new version of fluka has brought some capabilities of extended sources.
> I am having some question regarding the same and I have already seen the
> advanced workshop tutorials. I want to define an isotropic cylindrical
> source of Ir-192.
> I have written the following in the input file:
> BEAM ISOTOPE
> HI-PROPE 77. 192.
> BEAMPOS 0.0 0.0 0.24
> BEAMPOS 0.0 0.0325 0.06 0.42
> CYLI-VOL
> Now, I want to know whether I have to activate the FLOOD card in beampos to
> make it isotropic or it is already isotropic ? If it is not isotropic,
> how do I make it isotropic ? I am attaching the input card for reference
> also.
>
> With Regards,
> S. Chatterjee
> Scientific Officer,
> TLD Unit, BARC
> Variable Energy Cyclotron Centre,
> 1/AF, Bidhannagar,Kolkata-64
> Off:+91-33-23184207
> Fax:+91-33-23346871
>
>
>
Received on Fri Apr 29 2011 - 20:41:56 CEST