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The analysis of the fluctuations of signals coming from detectors in the vicinity of a subcritical assembly of fissile materials is commonly used for the control and safeguard of nuclear materials and might be used for the surveillance of an accelerator driven system . To supplement his incomplete Notes in the preparation of his biography Hughes made himself available for interviews , usually weekly , over a period of two and a half years . There are some differences in the treatment of the components so you need to be aware in which component your employee serves . Television analysts like John Sergeant and Andrew Marr are enthusiastic believers in the importance of politics . There are differences among loci in the level of differentiation .