https://pmc.ncbi.nlm.nih.gov/articles/PMC7497481/
Accounting for Unfissioned Plutonium from the Trinity Atomic Bomb Test - PMC
The Trinity test device contained about 6 kg of plutonium as its fission source, resulting in a fission yield of 21 kT. However, only about 15% of the 239Pu...
from theatomic bombaccountingplutonium