RESEARCH DIRECTED TOWARD THE STUDY OF THE RADIATION DAMAGE THRESHOLDS OF THE ELEMENTS
Abstract
The changes in residual electrical resistance produced by bombardment with high energy electrons were measured for a number of metals as a function of electron energy in the range from 0.5 to 1.5 Mev. The irradiations were performed at 20 K and lower and recovery measurements were made up to 300 K. The production curves were analyzed using simple displacement theory and the following values were found for the average threshold energies: Al--32 ev; Au--greater than 40 ev; Ag--28 ev; Cu--22 ev; Fe--24 ev; Mo--37 ev; Ni--24 ev; Ti--29 ev; and W greater than 35 ev. Approximate values for the resistivities of Frenkel pairs (in units of microhms cm per atomic per cent) were also obtained as follows: Al--3.4; Ag--1.4; Cu--1.3; Fe--12.5; Mo--4.5; Ni--3.2, and Ti--42. In the case of Al it was necessary to take secondary defect production into account; and a number of representative theoretical curves, based on different assumptions concerning the process of secondary defect production, are included. The behavior of Zn was anomalous in that the added resistivity was not a linear function of electron dose at 20 K. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1962
- Accession Number
- AD0276651
Entities
People
- P.g. Lucasson
- R.m. Walker
Organizations
- Air Force Cambridge Research Laboratories