Study of Fast Neutron Scattering. The Displacement Cross Section; ETUDE DE LA DIFFUSION DES NEUTRONS RAPIDES. SECTION EFFICACE DE DEPLACEMENT
Thesis/Dissertation
·
OSTI ID:4833702
A method is proposed for calculating the biological efficiency of fast neutrons emitted by in-pile fission sources. This method justifies the empirical theory of Albert and Welton. In making simple assumptions concerning the cross sections, it is supposed that the propagation can be reduced to a mono-kinetic problem. A system of orthonormal functions is then set up making it possible to calculate the flux leaving a planar source. This method generalizes the results obtained by Platzek to the case where the elastic cross sections are not isotropic, and make it possible in particular to define a displacement cross section. This method can be generalized to the case of neutron diffraction as a function of time, and to the study of slowing-down. Numerical results are given for the following: H/sub 2/O, D/sub 2/O, Fe, Be, Pb, CH, CH/sub 2/, BeO, C, Fe (raised dot) 3H/sub2 O, Fe (raised dot) H/sub 2/O, and 3Fe (raised dot) H/sub 2/O. These cross sections were verified experimentally in water and in graphite for neutrons of 2. 5, and 14 Mev. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Fontenay-aux-Roses
- NSA Number:
- NSA-16-022964
- OSTI ID:
- 4833702
- Report Number(s):
- CEA-2142
- Country of Publication:
- France
- Language:
- English
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