By M. M. R. Williams

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64) This method is particularly useful since the nature of output required blends conveni­ ently with digital on-line data processing techniques. A detailed experiment using polarity correlation has been performed by Dragt (1966ß) who based his work on the calculations of Veltman a n d Kwakernaak (1961). The experiment was performed on the L F R at Petten (Dragt, 19660) using digital equipment. The main idea of the project was to compare the conventional correlation method with the polarity method with a view to assessing the viability of the latter technique.

5) t An interesting biological analogue to this problem concerns the spread of an epidemic in which there is a delay time for incubation of the infectious carrier. This occurs with scabies, which can be passed by physical contact to a number of people before the first contact is made aware of its presence. By that time a very large number of people in the chain may have been infected and an epidemic can start before preventive measures can be taken. A branch of such a chain only terminates when one of the hosts is immune; however, other branches of the chain can continue and lead to a serious health problem.

6) and thereby deduce important reactor parameters more accurately. Let us consider the values of a¿, which we may write as ai > > ag > . . > > 0 ( / = 6). 14) As stated earlier, oc^ is the prompt decay and for all practical situations is large compared with the other a¿. 16) which is commonly referred to as the prompt-variance method since the role of delayed neutrons is only indirect: moreover, only one counting time need be used. 15) cannot be met in graphite or DgO systems, but McCulloch (1958) has used the method in a plutonium-fuelled system surrounded by a matrix of natural uranium.

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