RE: Please suggest

Hi,

there is another problem related to your question which was missed
yesterday. As your source particles are 320 MeV Alphas FLUKA currently
performs the 'transport', however does not perform 'interactions' (with
the default RQMD being set to 100MeV/nucleon). To a limited extend, the
sampling of 'interactions' could be reached by lowering the threshold of
the RQMD model (PHYSICS card) but again the !!! lowest !!! possible
limit (for 'interactions') is 51MeV, thus only of limited use in your
case. In addition, by lowering this limit, especially for alphas, the
accuracy of the results remains questionable.=20

Besides, and as a possible outlook for future FLUKA releases, a new BME
model is currently under development however not yet available for
public use.

Please find further information also in the following answer of the
fluka-discuss list:

http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0885.html

cheers

Markus

> -----Original Message-----
> From: Markus Brugger
> Sent: Donnerstag, 15. Mai 2008 14:38
> To: 'rravi@veccal.ernet.in'; fluka-discuss@fluka.org
> Subject: RE: Please suggest
>=20
> Hi,
>=20
> similar to the answer to Yuanjie it will depend if you are interested
> in particle energy fluence distributions 'only', or if you are
> interested by e.g., the angular distribution as well.
>=20
> USRBDX
> scoring average d2=D6/dEd=D9 (double-differential fluenceor current) =
of a
> given type or family of particles on a given surface (defined by the
> two 'touching' regions)
>=20
> USRYIELD
> scoring double differential yield of particles escaping from a
> surface. The distribution can be with respect to energy and angle, but
> also other more "exotic" quantities
>=20
> in addition, if you want to score the average fluence in a given =
volume
> (region) you can also apply one of the following two scoring options:
>=20
> USRTRACK, USRCOLL
> scoring average d=D6/dE (differential fluence) of a given type or
> family of particles in a given region
>=20
> -> see the manual for more details on each of the two cards
>=20
> hope this helps, cheers
>=20
> Markus
>=20
> > -----Original Message-----
> > From: owner-fluka-discuss@mi.infn.it [mailto:owner-fluka-
> > discuss@mi.infn.it] On Behalf Of rravi@veccal.ernet.in
> > Sent: Dienstag, 13. Mai 2008 08:04
> > To: fluka-discuss@fluka.org
> > Subject: Please suggest
> >
> > Hi All,
> >
> > I am new to this forum and also a novice user of Fluka. My =
best
> > regards to those great people who developed and made it available.
> > I have a problem. Can any body give me a suggestion ?
> >
> > I want to estimate the photon and neutron fluence emerging out of
> the
> > system
> > The system is:
> > 320 MeV Alpha beam falling on thick target of Tantalum; the =
emerging
> > neutrons etc falling on Fe cyclinder.
> > *******
> >
> > Is it possible to do that with 320 MeV alpha in Fluka?
> >
> > With best regards to all of you,
> >
> > R. Ravi Shankar
> > Scientific Officer,
> > Health Physics Unit,
> > VECC, 1/AF, Bidhan Nagar,
> > Kolkata 700 064.
> > India. Tel: +91 033 23371230-34 extn:3153
> > Tel (Residence): +91 033 23592432
Received on Sat May 17 23:20:24 2008