Ambient levels of Rn-220

["Nielsen, Erik" <NielseEC@NV.DOE.GOV>]

I am trying to locate a reference for the range of Rn-220 in the environment

(non-impacted areas).



I located values for Rn-222 in Eisenbud (0.1-0.5 pCi/L) and he talks about

Rn-220 but does not provide any reference values.



Any recommendations?



Erik C. Nielsen

Senior Scientist

Bechtel Nevada - Remote Sensing Laboratory

P.O. Box 98521, M/S RSL-24

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