Re: Alpha-activity of bricks

["Robbie Lindsay" <lindsayr@missouri.edu>]

The alpha activity in bricks will vary greatly depending on the clay from
which it was produced.  The  Dutch Nuclear geo-physics group at the KVI at
Groningen University, runs a research and commercial operation based on
distinguishing between clay (fine particles, much more radio-active)  and
sand based on their difference in radio-activity. They measure U-238 and
Th-232 by measuring gammas, but this can probably be related to the alpha
activity. You can find information on their web pages

http://ngd.kvi.nl/sediment/sedimentology.htm

and links on that page such as
http://ngd.kvi.nl/sediment/characterization.htm