Oleg Zabluda's blog
Monday, April 16, 2018
 
Gun-type fission weapon - Wikipedia

"""
In the case of Little Boy, the 20% U-238 in the uranium had 70 spontaneous fissions per second. With the fissionable material in a supercritical state, each gave a large probability of detonation: each fission creates on average 2.52 neutrons, which each have a probability of more than 1:2.52 of creating another fission. During the 1.35 ms of supercriticality prior to full assembly, there was a 10% probability of a fission, with somewhat less probability of pre-detonation.
"""
https://en.wikipedia.org/wiki/Gun-type_fission_weapon
https://en.wikipedia.org/wiki/Gun-type_fission_weapon

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