[ RadSafe ] Pb-210 Accumulation on Supply Fan Filters

Randy.Redmond at cns.doe.gov Randy.Redmond at cns.doe.gov
Mon Feb 15 15:41:37 CST 2016

Anyone else run across supply fan filters that have detectable beta-gamma that will not decay away like typical short-lived radon progeny?  Gamma spec shows a large Pb-210 peak.  Our thought process is there is an accumulation of Pb-210 on the filters because of the amount of air being moved and filtered;  the filters remain in use for several years; and the Pb-210 has a 20.4 year half-life.

[cid:image001.png at 01CF9A97.E7064240]

Randy Redmond
Y-12 Radiological Control
Radiological Engineering
Randy.Redmond at cns.doe.gov<mailto:Randy.Redmond at cns.doe.gov>
(865) 574-5640 Office
(865) 574-0117 Fax

More information about the RadSafe mailing list