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Ok Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains 

Forum: Hadronic Processes
Re: Question Problems in the time sequence of the radioactive decay of 232Th and 238U chains (Susana Cebrian)
Re: Idea Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains (Vladimir Ivanchenko)
Re: None Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains (Susana Cebrian)
Re: Idea Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains (Bjoern Herold)
Re: Ok Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains (Susana Cebrian)
Date: 25 Nov, 2010
From: Susana Cebrian <Susana Cebrian>

Dear Bjoern, I managed to reset the global time after the decay of the isotopes with huge half-lifes in the chains, and my problem is solved. So thank you very much again, Susana

On Tue, 16 Nov 2010 17:20:06 GMT, Susana Cebrian wrote:

> Hello Bjoern, thanks a lot for your answer, I am going to reset the
> global time after the decay, at least after the decay of 238U/232Th,
> having the extremely long half-lives which can make the trouble. It
> seems promising! Thanks again, Susana
> 
> On Wed, 10 Nov 2010 15:16:03 GMT, Bjoern Herold wrote:
> 
> > Hello Susana,
> > 
> > incidentally I am just struggling with a related problem. I think your
> > problem may result from the limited precision of the G4double that
> > stores the GlobalTime. That is, if the GlobalTime is large enough
> > (billions of years equalling some 10^25 nanoseconds, which is the unit
> > of GlobalTime) then small additions to GlobalTime, like a few minutes,
> > are lost in rounding errors.
> > 
> > In my application I need to track Cerenkov photons produced by K40
> > decays in water and record their time of impact. To do that I found that
> > I need to reset the GlobalTime of the decay products to zero, otherwise
> > the GlobalTime of the Cerenkov photons will always be equal to the decay
> > time, and their local time will always be zero.
> > 
> > I hope this helps. If you want a look at my code just let me know.
> > 
> > Cheers, Bjoern
> > 
> 

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1 Ok: Great to hear it worked :-)   (Bjoern Herold - 25 Nov, 2010)
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