Julia1979,
Your posts show little depth of understanding of radiological hazards posed by radon gas. The actual answer to this question of yours shows what I mean.
Your question: "Can you rule out that toxic alpha particals from thorium in the form of radon gas can be carried to the communities close to the LAMP by wind?"
The answer: Less than ten centimetres.
!!!!
What little radioactivity there is in the xenotime feedstock planned for the LAMP comes from thorium decay. There is only one isotope of radon in this decay series. The half life number you posted is wrong by several orders of magnitude. If you have made an honest mistake, I respectfully suggest you look at the wikipedia data again.
For your information, here are the appropriate wikipedia links.
http://en.wikipedia.org/wiki/Decay_chain#Thorium_series
http://en.wikipedia.org/wiki/Isotopes_of_radon
Would you like me to post the correct figure for the half life of radon?
crown/lamp, page-12
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