By A. F. Thomas

Show description

Read or Download Calculational Methods for Interacting Arrays of Fissile Material PDF

Best nuclear books

Nuclear Signaling Pathways and Targeting Transcription in Cancer

In the mean time, there is not any committed ebook to summarize the jobs, the importance, and strength healing concentrating on of transcriptional components from the point of view of signaling cascade, and hence, at once impacting the performance of transcriptional components in melanoma. additionally, this publication will supply a accomplished uncomplicated and scientific technological know-how at the back of the services of consultant middle transcriptional components.

Proliferation of Weapons of Mass Destruction in the Middle East: Directions and Policy Options in the New Century

This important booklet examines why states search to realize guns of Mass Destruction, a very important factor in constructing innovations opposed to proliferation. top specialists study particular international locations and the interaction between political, monetary, cultural and nearby elements riding judgements no matter if to obtain WMD.

Extra info for Calculational Methods for Interacting Arrays of Fissile Material

Example text

33), M s < 2M C - 1. 35) might well be valid for any system. Values of M have been calculated directly by Monte Carlo methods and by the Carlson S method of solution of the transport equation. The procedures employed are discussed in case (i) of the next section. Some of the more generally useful values of M which have been obtained are collated in Fig. 7. The extreme values of l/M are 1 for a unit of very small size and 0 for a critical unit. Woodcock has pointed o u t that "it appears . . that for (fissile) cores of the same material and of geometrically similar shape, l/M varies almost linearly with linear dimension between these limits.

5. Experimental measurement of the interaction parameter. Then if Q is the neutron output of the fissile body in isolation, S is the source strength, and E E the counter efficiencies for the source at A and B, respectively, then: u 2 Ci = E S, C = ES 3 X 2 9 C = E (Q + qS) + 4 X ES 2 9 q being the required interaction parameter. 24) to be a good approximation to the required #-value for two bodies the following conditions should be fulfilled: (a) That the source simulates as closely as possible the neutron emission of the body it replaces.

A n upper limit to this latter factor is exp [— (d — r) Lt] multiplied by the fractional solid angle subtended by the sphere at a point distance d from its centre. 48) provided d is not too small [cf. eqns. 29)]. 49) Where R is not known it can be determined experimentally or calculated in a similar manner to p. 50) should only be used as a last resort, since it has not been checked for conservativeness. An upper limit to R can be obtained from the reciprocal of the surface multiplication of the size of body which would be just critical when fully reflected.

Download PDF sample

Rated 4.43 of 5 – based on 12 votes