Nuclear weapons

Good morning, ladies and gentlemen. First, let me introduce myself. My name is Lenny and Im student at aptitude of Manufacturing Technologies of Technical University in Kosice. Im going to talk today approximately nuclear weapons. I would like to divide my presentation into deuce parts. Firstly, Ill talk about the A- go wrong and fission. Secondly, Ill define the H-bomb and unification reactions. If you dont mind, well leave the questions until the end.

THE BOMB

The simplest fission bomb, or A-bomb, consist of two pieces of 235U much(prenominal) that separately their masses are less than the comminuted mass, alone jointly their masses add up to more than the critical mass. To detonate such a bomb, the two pieces of 235U, initially at a safe distance from one another, are short brought closely together. The assembly of two subcritical masses into a unmarried supercritical mass must be carried out genuinely quickly; if the two are brought together slowly, a overtone salvo (predetonation) will push them apart prematurely, before the image reaction can release its full energy - the explosion fizzles. The device commonly used for the assembly of the two pieces of uranium toward the other at graduate(prenominal) speed (Figure 1); the propellant is an common chemical high explosive.

Fig. 1. A fission bomb utilize a gun deviceFig. 2.



An implosion device

A more sophisticated fission bomb consist of a (barely) subcritical mass of 239Pu; if this is suddenly compressed to a higher than normal density, it will become supercritical. The sudden abridgement is achieved by the preliminary explosion of a chemical high explosive such as TNT. If this explosive has been carefully coherent in a shell around a surface area of 239Pu (Figure 2), then its detonation will crush the sphere of 239Pu into itself; this implosion of the plutonium very suddenly...

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