This element, Pu, was first detected in a cyclotron at Berkely in 1940
Following his group's discovery of plutonium, Berkeley promoted 
Seaborg to ... to produce the first nuclear weapon ever detonated: the Trinity Test, 
July 16,... [DOC] [TLE] Plutonium - Periodic Table of Elements: Los Alamos National ... [PAR] Element 93 was discovered in 1940/41 by Glenn T. Seaborg, Edwin M. ... of 
uranium-238 in the 60-inch cyclotron at the University of California, Berkeley Lab.