Typically, a Fat Man design as tested at White Sands and used on Nagasaki, or 21 kilotons, sometimes 15 kilotons when Hiroshima is used for comparison, as in th

Typically, a Fat Man design as tested at White Sands and used on Nagasaki, or 21 kilotons, sometimes 15 kilotons when Hiroshima is used for comparison, as in the HBO Chernobyl miniseries.