[ RadSafe ] Po-210

franz.schoenhofer at chello.at franz.schoenhofer at chello.at
Mon Sep 12 14:11:09 CDT 2011


Mike posted it already, but let me repeat: Neutron activation of Bi-209 to Bi-210, this will decay by beta emission to (5 days half life) to Po-210. A very straightforward approach, well established. 

Please note that it is a decay product of Rn-222 (not 220).

Yes, the dating of sediments is usually done with this Pb-Po-method and it seems to be very accurate. Of course the amounts of Po-210 will be a little lower than the one used in Litvinenkos murder, which changes the analytical method considerably!

Best regards, - med vaenlig haelsning!


---- "Johansen schrieb:
> How does one produce Po-210 in a reactor?  I used to measure Po-210 in lake sediments as a proxy for its parent Pb-210 to determine sedimentation rates.  The sedimentation rate was based on the fact that it is a decay product of airborne Rn-220-> Po-218->Bi-214->Pb-210->Po-210 and that its parent Pb-210 is not in equilibrium with the Ra-226 in the sediments.
> Kjell Johansen
> NextERA Energy Point Beach
> kjell.johansen at NextERAEnergy.com
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Franz Schoenhofer, PhD, MinRat
Habicherg. 31/7
A-1160 Vienna
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