Thanks everyone and indeed I mixed up 137 and 133. So that explains that. The pictures are great I had never seen them before. Plan to go back and look further at them. Though not sure I can magnify them for a closer look. But will see what I can do. Regards Paul.
On Sat, Aug 27, 2011 at 10:45 AM, Tom Van Baak <t...@leapsecond.com> wrote: > Haven't figured the radioactive or not issue. >>> Regards and thanks. >>> Paul >>> WB8TSL >>> >> > Paul, > > The isotope of cesium used in atomic clocks is Cs133, which is > a naturally occurring, non-radioactive (stable) isotope. > > You're probably thinking of the other isotope, Cs137, which is > famous for being an unwelcome airborne radioactive by-product > of reactor accidents. In fact, there are still unnatural levels of > this isotope in the atmosphere due to fission weapons testing > during the cold war. > > But again, the kind of cesium in vitamins, in your body, and in > atomic clocks is the safe, stable, Cs133 variety. See also: > http://en.wikipedia.org/wiki/**Isotopes_of_caesium<http://en.wikipedia.org/wiki/Isotopes_of_caesium> > > I can't say the same for carbon (C14) or potassium (K40). See > http://en.wikipedia.org/wiki/**Banana_equivalent_dose<http://en.wikipedia.org/wiki/Banana_equivalent_dose> > > /tvb > > > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.