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No.40　13/08/13 07:23
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【Is the criticality a terrible phenomenon?】

In the early stages of the development of the atomic bomb,it was said that the amount of the criticality to produce the atomic bomb was 46.5 kilograms,in relation to uranium 235,and was just 10.1 kilograms concerning plutonium 239.⚠

《The amount of the criticality has decreased!》

However,the amount of the criticality is influenced,according to purity of the uranium,a shape of the lump of uranium,and circumstance around it.☝

For example,if the lump of the uranium is thin like aluminium tin アルミ箔,or is long and slender like a wire,the neutron will come out of the lump easily,so the amount of the criticality becomes bigger.It means the probability of the chain reaction also becomes less,and we are safe.🙆

Contrary to it,if the surface area 表面積 of the lump is minimum against its weight,the amount of the criticality becomes the smallest.Either,if the lump is covered with a thing which reflects the neutron,the amount of the criticality becomes less.Perilous!💀