[time-nuts] Dead CBT

paul swed paulswedb at gmail.com
Sat Aug 27 15:07:18 UTC 2011

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.

On Sat, Aug 27, 2011 at 10:45 AM, Tom Van Baak <tvb at 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
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