|Message: Re: Problems in the time sequence of the radioactive decay of 232Th and 238U chains||Not Logged In (login)|
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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,
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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