Try digitalPLUS for 10 days for only $0.99
The Baltimore Sun

Radioactive material at APG

The illumination part of a later generation radioluminescent deck marker that used strontium 90. Older markers found on the Aberdeen Proving Ground's Edgewood Area used radium 226 for luminescence.Oak Ridge Associated Universities, Homestead Publishing
This photo is featured in these articles:
Loading
16°