| dbo:abstract |
The term insertion time is used to describe the length of time which is required to rearrange a subcritical mass of fissile material into a prompt critical mass. This is one of the three main requirements in a nuclear weapon design to create a working fission atomic bomb. The need for a short insertion time with plutonium-239 is the reason the implosion method was chosen for the first plutonium bomb, while with uranium-235 it is possible to use a gun design. The basic requirements are: * To start with a subcritical system * To create a super prompt critical system * To make the change between these two states in a length of time (insertion time) which is shorter than the time between the random appearance of a neutron in the fissile material through spontaneous fission or by other random processes. * Also at the right moment in time, neutrons must be injected into the fissile material to start up the fission process. This can be done by several methods. * Alpha emitters such as polonium or plutonium-238 can be rapidly combined with beryllium to create a neutron source. * Neutrons can be generated using an electrostatic discharge tube, this tube uses the D-T reaction. (en) |
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| rdfs:comment |
The term insertion time is used to describe the length of time which is required to rearrange a subcritical mass of fissile material into a prompt critical mass. This is one of the three main requirements in a nuclear weapon design to create a working fission atomic bomb. The need for a short insertion time with plutonium-239 is the reason the implosion method was chosen for the first plutonium bomb, while with uranium-235 it is possible to use a gun design. The basic requirements are: (en) |
| rdfs:label |
Insertion time (en) |
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freebase:Insertion time yago-res:Insertion time wikidata:Insertion time https://global.dbpedia.org/id/4nG2g |
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wikipedia-en:Insertion_time?oldid=805738769&ns=0 |
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wikipedia-en:Insertion_time |
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dbr:Index_of_physics_articles_(I) dbr:Nuclear_weapon_design dbr:Spontaneous_fission |
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wikipedia-en:Insertion_time |