Positron Annihilation Spectroscopy of Rocks
Abstract
The techniques of positron annihilation spectroscopy (Doppler Broadening (DB) and Lifetime Measurements (LT)) have been applied to the study of well-characterized rock samples. Among the measured rocks were: 1) sandstone and carbonate samples (limestones, dolomites, marbles) in different states (dry or soaked), 2) opals in different maturation stages, and 3) anhydrite. Several samples from the same rock have been measured at room temperature. Some samples have been measured during heating/cooling (20-220^0C) cycle with simultanous analysis of residual gases. The measurements have shown that the DB- and LT-parameters are reproducible and reliable bulk properties of rocks and can be used to categorize rocks in the same way as the density or porosity. The physical model based on the compositional and structural differences among rocks has been proposed to explain the observed differences in the positron annihilation parameters. (Supported by the Chevron Petroleum Technology Co. and the TCU Research Fund)
- Publication:
-
APS Texas Sections Fall Meeting Abstracts
- Pub Date:
- October 1998
- Bibcode:
- 1998APS..TSF..CB01U