You can get better case depth measurements with radioactive isotopes.

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Bibliographic Details
Title: You can get better case depth measurements with radioactive isotopes.
Authors: Kirshenbaum, A. D., Boynton, H. C.
Source: Iron Age (New York, N.Y.).; May 14 1953, Vol. 171, p138-140, 3p
Database: Applied Science & Technology Source
Description
ISSN:00211508