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Radiation levels long ago

To: radsafe-d@fz-juelich.de, radsafe-eu@fz-juelich.de, radsafe@romulus.ehs.uiuc.edu
Subject: Radiation levels long ago
From: lars.persson@ssi.se
Date: Mon, 20 Jul 1998 16:14:47 -0600

Due to radioactive decay the natural radiation levels were larger long ago.
Has anyone seen an article on natural radiation levels very long ago (some 
millions of years)?
LP

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