Dear Giorgi and Alfredo,
thank you very much for the answers.
Il giorno lun 25 apr 2022 alle ore 10:20 Giorgi Kharashvili <
giorgi.kharashvili_at_daes.pro> ha scritto:
> Dear Sebastiano,
>
> The Cu-66 that you observe 50000s after the EOB is coming from beta- decay
> of Ni-66.
> If you compare these two isotopes in your tab.lis files, you will notice
> that after some decay time Cu-66 is in equilibrium with Ni-66.
>
> Best regards,
>
> --
>
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> On 2022-04-22T17:14:03.000+02:00, SEBASTIANO PAOLUCCI <
> sebastiano.paolucci_at_studenti.unicam.it> wrote:
>
> Dear Fluka expert,
>
> I’ve tried to calculate the activity of copper isotopes after a proton
> irradiation onto a 70Zn enriched target. (see the entire details in the
> file .inp attached)
>
> After the EOB (End of bombardment), the activity of all isotopes decays
> exponentially, following the respective decay constants. I’ve verified
> this, scoring the activities at 2 different times after the EOB
> (t=EOB+50000s and t=EOB+200000s).
>
> The problem appears for the 66Cu isotope: this should decay with a half
> life of 5 minutes, and so after only 50000 seconds after the EOB, the
> activity should goes to zero. This does not happen. It seems like the half
> life of 66Copper is different from 5 minutes. (see _sum.lis file attached)
>
> Furthermore, If you try calculate the decays constants for all the other
> copper isotopes involved (only using the activity a t=EOB and one between
> the 2 instant t=EOB+50000s or t=EOB+200000s), you obtain a coherent and
> correct values of the half lives. Instead, if you try to achieve the half
> life of 66Cu through this method, you obtain different results if you use
> t=EOB+50000s or t=EOB+200000s: respectively 2 hours and 7.5 hours of half
> life. (that are however wrong values)
>
> I do not understand how to solve this problem.
>
> Thanks.
>
>
> Sebastiano
>
>
>
>
--
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Received on Tue Apr 26 2022 - 14:24:28 CEST