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Re: Radon equilibrium fraction in outdoor air
NCRP 45 (1975), page 83, Table 24 Degree of radon daughter equilibrium has
the following relative activities of
Po-218 : Pb-214 : Po-214 for outside air:
Condition not given 1 : 0.8 : 0.8
Rural 1 : 0.6 : 0.5
Urban roof 1 : 0.7 : 0.6
Urban street 1 : 0.6 : 0.4
Urban street 1 : 0.8 : 0.8
It also has this to say:
"The short-lived daughter products of radon can approach radioactive
equilibrium whenever there is no opportunity for separation from the source
of radon. This can be true outdoors during inversions."
Note the average of the values given for the relative activities Po-218 :
Pb-214 : Po-214 are 1 : 0.7 : 0.6
"Cook, Lew (LCOO)"
<LCOO@chevron.com> To: Multiple recipients of list
Sent by: <radsafe@romulus.ehs.uiuc.edu>
radsafe@romulus.eh cc:
s.uiuc.edu Subject: Radon equilibrium fraction in
outdoor air
02/07/00 09:28 AM
Please respond to
radsafe
What is a good consensus number for Radon equilibrium (short half lived
decay products only) in outdoor air?
Lew
510 242-7040
lcoo@chevron.com
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