الفهرس 
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Abstract
In the scope of reactor design , one can devide the physical work into two main parts :a) The method of calculation b) The adjustment of the met>od to be use£ull. for calculations.
The first part is covered by the Americans (code MUFT’
the EnRlish ( code WIMS ) , the Frensh ( code .APOLLO , ..etcTo cover this part in Egypt, and to develop an Egyptian code, we have devided it into two main divisions : the tberma
tion calculations ,which were given by
El-Sherbin (53),and the slowinp;’ down calculations given in this thesi,~;:
The aim of this ”lark is to’ find a method for calculating the slowing down parameters, and the date to be used for
several types of” reactors.
The multigroup treatment is considered
as the preferable method of calculations.In this work.