Re[2]: Th-232 air sample analysis

[Rodney Bauman <rodney_bauman@wssrap-host.wssrap.com>]

I would imagine that this method also requires a sample decay period of many
(7+) days prior to counting, in order to allow for decay of the short-lived
thoron daughter products.

If you've got the time (and no other alpha-emitting interference), this method
is much less expensive than alpha spec.

Rodney Bauman, CHP, RRPT
rodney_bauman@wssrap-host.wssrap.com

____________________Reply Separator____________________
Subject:    Re: Th-232 air sample analysis 
Author: <radsafe@romulus.ehs.uiuc.edu>
Date:       9/20/99 4:50 PM

We meet this limit using a dedicated zinc sulfide alpha scintillator (Ludlum
43-1) attached to a scaler (Ludlum Model 1000).  The air sample needs to be
fairly high volume, though.  Using the following parameters gives an LLD of
3.8E-15 µCi/mL

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