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Radium Half Life (was Alarms at Borders)
At 05:52 PM 1/12/2005 -0500, I wrote:
>The radium check sources have substantially reduced output due to the
>relatively short half-life, while the uranium check sources are
>essentially at their initial radioactivity.
Thanks to everyone reminding me that radium's half life is 1600-1620 years.
The manual (which I used as my source of information) for the Lionel CD
V-700 Model 6B from 1962 states "The Radium D + E beta source
...half-life...is approximately 22 years."
So, whatever I have it tracked that estimate (within the appropriate
resolution).
It was the 22 years which I was referring to as stated in the manual and
confirmed (by cross-checking two CD V-700s against their respective check
sources.
Cheers,
Richard
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