ASTM E 1496 - 97. Standard Test Method for Neutron Radiographic Dimensional Measurements

American Society for Testing and Materials (ASTM). 1997, 4 pages.
This test method provides a technique for extracting quantitative dimensional information on an object from its neutron radiograph. The technique is based on the identification
of changes in film density caused by material changes where a corresponding discontinuity in film density exists. This test method is designed to be used with neutron radiographs
made with a well-collimated beam. The film densities in the vicinity of the edge must be in the linear portion of the density versus exposure curve. The accuracy of this test method may
be affected adversely in installations with high-angulardivergence neutron beams or with large object-to-film distances.