Implosion type

Japanese: インプロージョン型 - いんぷろーじょんがた
Implosion type

...The first method is called the gun barrel type, in which fissile material ( 235U or 239Pu ) that would exceed the critical limit if combined is placed separately at either end of a gun barrel-shaped container and then rapidly combined by the explosion of an explosive. The second method is called the implosion type, in which a subcritical amount of fissile material is compressed so strongly that the surface area is reduced, even though the mass remains unchanged, and the criticality is exceeded (Figure 1). The power of a nuclear weapon, both for fission weapons and for fusion weapons (described below), is expressed in terms of the amount of TNT explosive that releases the same amount of explosive energy as the energy released in the nuclear explosion. ...

*Some of the terminology explanations that refer to the "implosion type" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…第1の方法はガン・バレル型と呼ばれるもので,合体すれば臨界をこえる量の核分裂物質(235Uや239Pu)を砲身状の容器の両端に分離して配し,爆薬の爆発で急速に合体させる方式である。第2の方法は爆縮型あるいはインプロージョン型と呼ばれ,臨界量未満の核分裂物質を強力に圧縮することによって,質量は不変でも表面積が小さくなるために臨界をこえることを利用している(図1)。 核兵器の威力は,核分裂兵器および後述の核融合兵器とも,その核爆発で放出されるエネルギーと同量の爆発エネルギーを放出するTNT爆薬の量で表現する。…

※「インプロージョン型」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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