info needed (natural radioactivity in building materials)

[coltremb@rsvs.ulaval.ca (Colette Tremblay)]

Fellow radsafers:
I need information about naturally occuring radioactivity levels in
building materials, with specific references to north american sources of
materials (stone, cement, etc). Can someone direct me to a source of
information on this topic?
Tahnk you very much.

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----Colette Tremblay
Recherches en sciences de la vie et de la sante
Pavillon Charles-Eugene-Marchand
Universite Laval Quebec QC
Canada  G1K 7P4

Tel: (418) 656-2893
Fax: (418) 656-7176
Email: coltremb@rsvs.ulaval.ca