In November 1943 some plutonium trifluoride was reduced to create the first sample of plutonium metal: a few micrograms of metallic beads.[50] Enough plutonium was produced to make it the first synthetically made element to be visible with the unaided eye.[78] The nuclear properties of plutonium...
61. ^ Cochran, Thomas B. (1997). "Safeguarding nuclear weapons-usable materials in Russia". International Forum on Illegal Nuclear Traffic. Washington (DC): Natural Resources Defense Council, Inc. http://docs.nrdc.org/nuclear/nuc_06129701a_185.pdf. Retrieved 2008-12-21. 62. ^ Stockholm In...