Abstract
Fast neutron radiography offers a number of advantages in comparison with the usual methods of thermal neutron radiography. It does also present a number of problems. Perhaps the most important of these problems lies in the development of a suitable imaging detector of good efficiency. The plastic fibre based scintillator, provides an efficient detector without the disadvantages of light-scatter and spreading associated with planar plastic scintillators. In this work, Monte Carlo methods have been used to study in detail the physics of image formation and degradation in scintillators, with particular reference to fibre-based scintillators, as a function of fibre length, material composition and diameter as well as neutron energy and imaging geometry. The results are being compared with experimental determinations of the edge function for both fast neutron and gamma-ray radiography.
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