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    Re: what is a second?
    From: Peter Fogg
    Date: 2006 May 10, 01:45 -0500

    Frank wrote:
    > Just FYI,  Cesium-133 is a stable isotope, not radioactive.

    Well there's my quota of new things learned for today. Caesium emits
    radiation, it seems, while not normally being radioactive. However;
    "Radioactive isotopes of caesium are used in the medical field to
    treat certain types of cancer" accroding to Wikipedia. Caesium-133 is
    the only naturally occurring stable isotope in the family.

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