Radioisotopic Sand Tracer Study, Point Conception, California. Preliminary Report on Accomplishments July 1966-June 1968

摘要

The purpose of the study is to develop and use radioactive tracers for research in sand movement and littoral processes. Objectives include determination of suitable radioactive isotopes, development of radiation detectors, and development of handling and survey programs. Concurrent with these objectives, studies of sediment transport around the Point Conception headland and of the mechanics of littoral transport are being conducted. Methods developed by this program have direct application to engineering design of such works as harbor development and beach erosion prevention, and quasi-military application such as the location of radioactive or other toxic materials. Sand grains indigenous to the study area have been labeled with xenon-133 which does not adversely affect the hydraulic properties of the sand. A mobile detector system using cesium iodide crystals and housed in a 'ball' towed behind an amphibious vehicle detects quantity and areas of radiation. Computer programs correct and plot radiation data. A field test of equipment and principles at Cape Kennedy, Florida, was successful. Additional field tests were at Surf and Point Conception, California. (Author)