MartinM wrote: ↑
14 Jun 2019, 22:41
Guys, there's just one problematic assumption you make. You take the date of 3/11/2011 as the date when those isotopes were created.
But this is not true - the material existed in the reactor for quite some time (could even be a few years). It was just expelled from the reactor in March 2011 (actually a few days after the earthquake/tsunami depending on which reactor it was).
The exact 'creation date' is impossible (Steven note the "impossible" ;-) to determine. Depends on refueling cycles and it's for sure a mixture of isotopes created at different times. The only thing that can be assumed is that it's not younger than 3/11/2011.
yeah, of course nobody can tell exactly when the material was created by fission inside the reactor.
What we tried to do at the beginning of this thread was to go back in time since March 11 in terms of relative ratio between Cs137 and Cs134, and I think when Steven talked about "initial state" he meant the relative ratio of the two isotopes at the time they were released into the atmosphere, which we assumed to be March 11, but it could be a few days later since the release of radionuclides from the power station didn't just happen on March 11, but over several days and according to this book I am reading it peaked on March 15.
https://books.google.it/books/about/Rad ... &q&f=false