Abstract
Observations are presented of the density-exposure and reciprocity law failure characteristics of Polaroid Type 57 and Type 52 film in conjunction with NE421 and NE905 light-emitting thermal neutron intensifying screens. The NE421-Type 57 system proved to be the fastest radiographically and also has extremely good reciprocity failure characteristics, which makes it a useful image recorder for radiography with low intensity neutron beams. To carry out the measurements and faciliate the use of Polaroid positive film in radiography, two ‘cameras’ were constructed based on the Polaroid Land type 500 sheet film holder. These are described in some detail as they may be a general interest, and an example is given of their use in locating a waxy blockage in a thick-walled pipe.
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