Radiography with low intensity neutron beams: some reciprocity failure characteristics of films used with light-emitting intensifying screens

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Abstract
The reciprocity law failure characteristics of photographic films used with light emitting screens (NE421 and NE905) have been studied to facilitate the estimation of exposure times at low neutron beam intensities. Observations were made in the intensity range from 102 to 105 neutrons per cm2 s - the limits of practical interest for light emitting screens. In this region it was expected that only low intensity reciprocity failure would be observed and this was confirmed. The reciprocity characteristics observed are shown as plots of exposure time t as a function of beam intensity , which is thought to be the most useful presentation for radiographic use and enabled the degree of applicability of the Schwarzschild relation (tp = constant) to be ascertained. The relation was found to fit the observations well with a constant value for the index p which is characteristic of the film and close to the values found in photographic work.

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