STUDIES OF STRESS CORROSION CRACKING BY THE MOSSBAUER EFFECT.
Abstract
An investigation into various techniques for carrying out Mossbauer effect (ME) measurements in a non-destructive, in situ manner requiring no sample preparation (backscatter ME measurements) is reported. The research was directed toward detecting the 2% abundant Fe57 nucleus which is common to iron alloys so that environmental changes brought about by stress and/or corrosion could be followed. Comparisons of three backscatter ME experiments which employ different geometrical arrangements of the source, sample, and counter and which detect the 14.4 kev gamma-rays or 6.3 kev internal conversion X-rays are given. It is found that the most efficient technique for performing backscatter ME measurements is to use a geometrical arrangement designated as 'around-the-corner' detecting 6.3 kev internal conversion X-rays. A discussion of the background count rate is given along with a description of an anti-coincidence system which can be used to significantly reduce the background but only for weak sources. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1967
- Accession Number
- AD0660038
Entities
People
- C. S. Naiman
- J. H. Terrell
- R. H. Forsyth