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<p>[QUOTE=&quot;bradgator2, post: 4530360, member: 110679&quot;]I have not checked my radionuclide book to confirm that 22 second halflife cited in the writeup....&nbsp; but the rule of thumb is a radioactive material has reached background level after 10 halflives.&nbsp; So it would basically be back to normal in 220 seconds.[/QUOTE]</p><p><br /></p>

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