Neutron Radiography Utilizing Selected Energy Interactions
We intended in this chapter to describe the work of the Materials Sciences Division of AMMRC in attempting to bring new methods of materials characterization to the fore. I wanted to talk about neutron radiography, but earlier in the meeting it became clear that we were in trouble, not having brought with us a single visual aid showing a crack or other mechanical failure. By the second day of the meeting we were in even deeper trouble, not having a slide showing incipient stress corrosion.
But the program soon unfolded a fine new picture of the status of fracture mechanics. It was good to see theory accept the idea of macroscopic defects in real material, and to see the producers of this material striving to characterize better the materials they can provide rather than attempting to provide the perfect materials theory would like to demand. The non-destructive testing community then expressed their desire to contribute at the design stage so that measurable minimum defect sizes would always be specified.
If this approach is accepted it will undoubtedly follow that the designer will soon be pressuring the NDT community to refine its technologies to provide even better resolution of defects to satisfy the designer's needs. And at last we can see where the work we are attempting to do in the area of nondestructive materials characterization might be of interest to the reader. Two particular developing techniques will be reviewed in this chapter: fission neutron radiography and subthermal neutron radiography.
KeywordsThermal Neutron Neutron Source Cellulose Nitrate Fission Neutron Neutron Radiography
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