ความคิดเห็นที่ 26
เปรียบเทียบ2วิธี gun-type ล้าสมัยเมกาเลิกทำยุค60
วิธีimplosion มีลูกเล่นหลายอย่าง น้ำหนักน้อยกว่า
http://en.wikipedia.org/wiki/Nuclear_weapon_design#Implosion_method
Comparing the two methods
The gun-type method is essentially obsolete and completely abandoned by the United States by the early 1960s. There was some use of the design, or possibly a variant "double gun" design (in which two subcritical masses were accelerated towards each other), in nuclear artillery [2]. Other nuclear powers, such as the United Kingdom, never built any of this type of weapon. As well as only being possible to produce this weapon using highly enriched U-235, the technique has other severe limitations. The implosion technique is much better suited to the various methods employed to reduce the weight of the weapon and increase the proportion of material which fissions.
วิธีGun-typeมีปัญหาเรื่องความปลอดภัย
Gun-type weapons also have safety problems. It is inherently dangerous to have a weapon containing a quantity and shape of fissile material which can form a critical mass through a relatively simple accident. Also, if the weapon falls into water, then the moderating effect of the light water can also cause a criticality accident, even without the weapon being physically damaged. Neither can happen with implosion-type weapons since there is normally insufficient fissile material to form a critical mass without the correct detonation of the lenses.
วิธีImplosion อาจเอาตรงกลางออกได้ จึงปลอดภัยกว่า
-type weapons normally have the pit physically removed from the center of the weapon and only inserted during the arming procedure so that a nuclear explosion cannot occur even if a fault in the firing circuits causes them to detonate the explosive lenses simultaneously as would happen during correct operation. It has also been hypothesized, based on open sources, that the Permissive Action Links for some types of nuclear weapons may involve the use of encoded secret timing offsets for the explosives in a given weapon's combination of explosives and lenses, needed to create a unified focus for the shockfront.
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