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All about Hortense

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Bob Cunningham - 30 Jan 2004 15:44 GMT
In a recent discussions of standards of measurement I made
the mistake of picking up on something someone else had said
and using it myself as if it was true.

It appears that I shouldn't have been so trusting.  A little
Web surfing shows that it's probably not the rate of decay
of a cesium atom that the standard second is based on.  It
seems to be some other behavior of a cesium atom.

One example is at
http://www.boston.com/globe/search/stories/nobel/1989/1989i.html

   [...] cesium or atomic clock, which uses highly
   regular oscillations of parts of the cesium atom to
   determine the length of a second.

But this is a side issue.  It has no effect on the validity
of other statements I've made in that discussion.
John Briggs - 30 Jan 2004 16:20 GMT
> In a recent discussions of standards of measurement I made
> the mistake of picking up on something someone else had said
[quoted text clipped - 4 lines]
> of a cesium atom that the standard second is based on.  It
> seems to be some other behavior of a cesium atom.

That's because it's an atomic clock and not a nuclear one.
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John Briggs

 
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