Samples of nominally pure single crystal KCI were irradiated by H, H,, He, C and N positive ions in the energy range 0-2 MeV. The growth of F-type centers was recorded as a function of ion fluence. Depth profiles of damage by H and He ions were constructed, and it was found that the damage profile does not follow the stopping power as a function of penetration depth in the target. Determinations of damage track radii, based on the data, were done, and found to be on the order of 10 A. Comparisons of defect production by Hz with H at the same fluences of nuclei and the same energy per mass showed at low energies more defects by H than by H, , the difference attributable to track overlap.
This report covers the activities of a small group at Brookhaven National Laboratory (BNL) studying radiation damage in.natura1 rock salt, synthetic NaCl crystals, granite, basalt and other minerals of interest for radioactive waste disposal applications. The people involved are:
Ten shale samples from several Cretaceous stratigraphic units (Colorado Group) of the Western Canada Sedimentary Basin were obtained for determination of effective porosity (øE) and apparent formation-factor (Fa) as a function of confining pressure (Pc). These
samples are part of a study to investigate the possibility that shale petrophysical property changes, in response to unloading by erosion of overburden, have contributed to the development of subhydrostatic pressures within the Cretaceous succession of the basin.
Results indicate that øE (0.9-13%) and Fa values (200-3800) at different confining pressures (Pc: 0-65 MPa) show trends that are typical of shale, with øE decreasing and Fa increasing with increased Pc; however, one sample from a siderite concretion unexpectedly displays a reverse Fa-Pc
relationship. There are subtle indications that increased pore compressibility may be associated with abnormally pressured shale. These data form the basis for detailed analysis and interpretation in forthcoming studies.
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