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Abstract
Neutron radiography is a relatively new non-destructive testing technique, the first experimental work having been carried out during the period 1939-1945. Its main advantages are to offer increased penetration of certain elements (such as zirconium and niobium), increased sensitivity in the detection of certain inclusions (notably hydrogen and boron), and complete discrimination against gamma ray fogging of the radiographic film.
Two types of phosphor are used in neutron radiography; the first type consists of a mixture of ZnS grains and a LiF neutron detector, while the second type is a homogeneous glass containing cerium oxide as the phosphor and Li6 as the neutron detector.
The author has experimentally optimized the granular type, resulting in a 100% increase in radiographic speed, and in the case of the glass scintillator has developed a technique for eliminating multiple internal reflection in the body of the scintillator which has resulted in improving the edge resolution of the scintillator from 500μ to 250μ.
Computer calculations are presented on the author’s proposed model of the behaviour of the glass scintillator, and these are shown to lead to increased understanding of the emission mechanism of these phosphors.
A selection of neutron radiographs are presented to illustrate the practical applications of the research work.
Notes
Paper presented at a Conference on “New Trends in Radiography” organized by the science committee of the royal Photographic Society, 8-9 December 1970 in London.