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|Title:||Littoral studies near San Francisco using tracer techniques|
|Authors:||University of California at Berkeley|
United States. Army. Office of the Chief of Engineers
Kamel, Adel M.
|Publisher:||United States, Beach Erosion Board|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical memorandum (United States. Beach Erosion Board) ; no. 131.|
From the Preface: Differences in concentrations of mineral composition of beach areas along the shoreline have on occasion been used to estimate direction of movement of littoral drift and other littoral processes. Extension of these methods to the use of naturally radioactive thorium as a means of detecting direction of littoral drift has been made over a portion of the California coast from the Russian River to Point San Pedro. This report discusses these methods and the results which indicate the method to be rather quick for qualitative results and quite simple compared to normal mineralogical analysis. After separation of the heavy mineral fraction from samples taken along the beaches, radioactivity present is determined by use of a two-channel gamma-ray spectrometer with one channel adjusted on the 0.238 mev. peak from Pb(212) in the thorium series and the other on the 0.118 mev peak from Ra(226) in the uranium series. As the method and its results appear of considerable interest in the field of beach erosion and shore processes, it is now being published as a Beach Erosion Board Technical Memorandum Note: Numerals in brackets should have appeared as an atomic number.
|Appears in Collections:||Technical Memorandum|