الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
the design of thermal reactors and formulation of the slow neutron spectrum has often been based on approximate treatment of the neclear physics and on extensive expermental tests to determine or adjust reactor parameters. As a very complex structure both materially and geometrically, a nuclear reactor consists of a large number of absorbing and fissioning fuel elements, often of quite complex design, embedded in a moderator.