Accession Number : AD0454600

Title :   APPLICATION OF SOLID STATE TECHNIQUES TO THE ONSITE INSPECTION PROBLEM.

Descriptive Note : Final technical rept.,

Corporate Author : SHELL DEVELOPMENT CO EMERYVILLE CALIF

Personal Author(s) : Lewis,Donald R. ; Orr,W. R.

Report Date : DEC 1964

Pagination or Media Count : 42

Abstract : The passage of a pressure wave through a rock may produce defects in the lattice of the crystals which comprise the rock. These defects may be detected by measurement of thermoluminescence or exoelectron emission from certain rock types. In order to determine how sensitive these techniques may be for the on-site inspection problem, work has been done to develop apparatus for measuring exoelectron emission above room temperature and to investigate the influence of sample preparation on the thermoluminescence of some minerals. An exoelectron measuring unit has been built and used for some preliminary comparisons with thermoluminescence measurements on the same sample. It has been found that there may be additional defects contributing to the exoelectron emission which do not contribute to the thermoluminescence. Exoelectron measurements may be more sensitive than thermoluminescence for detecting the passage of a pressure wave. Several other electrical and optical techniques were considered and some recommendations have been made for the measurement of thermoluminescence spectra. General recommendations are made for the construction of exoelectron and thermoluminescence apparatus. (Author)

Descriptors :   (*UNDERGROUND EXPLOSIONS, DETECTION), SOLID STATE PHYSICS, INSTRUMENTATION, ELECTRONS, MINERALS, VISUAL INSPECTION, MEASUREMENT, SODIUM COMPOUNDS, LIMESTONE, THERMAL PROPERTIES, LUMINESCENCE, GLOW DISCHARGES, CRYSTAL LATTICES, MECHANICAL WAVES, DETONATION WAVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE