Glenn Seaborg and Art Wahl isolate the first pure neptunium-239 (0.25 micrograms). In a matter of days it decays into a (barely) visible speck of pure plutonium.
Related Images:
Date Range:
1941CE Mar 6th
Hear the stories of the Manhattan Project
Tour the Sites of the Manhattan Project
Read recent news & articles
Support our efforts - visit our store!
