# Re: Activity value 0.0000E+00???

From: Sebastien WURTH <wurth_at_ipno.in2p3.fr>
Date: Wed, 25 Nov 2009 13:08:04 +0100

Hello Angelo,

I began my answer before I saw your second mail, that's the reason why I
started the explanation from the beginning.

To understand properly you should have some real example : I have an
electron beam of 6.25e13 e- per second, for say a week (convert in
seconds 86400*7), here are the two values for "irrprofile". Then you
want to calculate activity in a given region (resnuclei), one minute
after the end of irradiation, here is your cooling time : 60.0.
You should have :
* a decay time card
* a resnuclei card
* a dcyscore card to link the last two

And of course, you have to create some nuclear reaction in that given
region !
Make sure your physical properties are set in the proper way.

When DCYSCORE is applied to a detector, results are given per unit time
(for instance Bq for a resnuclei card).
The number of primaries put in the START card has nothing to do with the
number of particles involved in the physical process whereas the one
given in the IRRPROFIle card has.

I think I never tried witout defining a profile, I don't know if it
could give some result.

Hope it helps,
Regards.

Sebastien.

Angelo Infantino wrote :

> Sorry, but probably i don't have understand very good.
> I tryed to do a simplest simulation to understand better the use of
> this card but
> i have the same results.
> Activity 0.0000E+00 and Resnuclei empty. What is wrong?
> Another question. What mean have the number of primary when i put a
> particle current in the IRRPROFI card?
> For example if i put primary=100 and p/s=100000, what is the number of
> particle that i'm simulating??? 100 or 100000?
> Thank you
>
> Angelo Infantino
>
>
>
> > Date: Tue, 24 Nov 2009 12:50:42 +0100
> > From: wurth_at_ipno.in2p3.fr
> > To: angeloinfa_at_hotmail.com
> > CC: fluka-discuss_at_fluka.org
> > Subject: Re: Activity value 0.0000E+00???
> >
> > Hello Angelo,
> >
> > You should define some cooling time (card DCYTIMES) and some link
> > between those cooling times (card DCYSCORE) and your detectors
> > (RESNUCLEi or USRBIN) and some irradiation profile (card IRRPROFIle)
> > (see manual for those options). The RADDECAY card only is not enough to
> >
> > Hope it helps.
> >
> > Regards.
> > Sebastien.
> >
> >
> > Angelo Infantino wrote :
> >
> > > Good morning to everyone,
> > > i'm trying to calculate the activity in the several regions of my
> > > target. I know that i produce some radionuclides during the
> > > irradiation by protons of my target but the value of the activity in
> > > the several regions is always 0.0000E+00. How it's possible? I'm also
> > > tryed to active the RADDECAY card but i obtain the same result. What
> > > is wrong in my input file? I attach the .inp file.
> > > Thank you very much for yours help.
> > > Regards
> > >
> > > Angelo Infantino
> > > <http://www.windowslive.it/moviemaker.aspx>
> >
>
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Received on Wed Nov 25 2009 - 15:40:10 CET

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