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Littleboy was about as small as you get, 15 KT. Anything smaller means it was an ineffcient bomb, or designed for some other effect (neutron radiator).
Remember, Hiroshima was destroyed with a 15KT bomb. Nagasaki was destroyed with a 22KT bomb. PRNK is making Plutonium bombs. Iran is making Uranium Bombs. U235 bombs are easier to make work, but the material is harder to producer (Isotope separation). Plutonium bombs are harder to make work (Critical to Super critical ratio lower) but the material is easier to separate (Chemical reprocessing).
The Megaton bombs the US and Russians have are Hydrogen FusionBombs which use a Fisson trigger. PRNK and Iran are not likely to develop these anytime soon. The fission bombs do have an upper limit as you can have only a certain amount of critical mass around before the nuclear reaction goes critcal.
ANYWAY, the Federation of American Scientists (FAS) is a well known anti nuke group.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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