Natural and man-made radionuclide distributions in Northwest Pacific deep-sea sediments: (rates of sedimentation, bioturbation and 226Ra migration)
نویسندگان
چکیده
منابع مشابه
assessment of deep word knowledge in elementary and advanced iranian efl learners: a comparison of selective and productive wat tasks
testing plays a vital role in any language teaching program. it allows teachers and stakeholders, including program administrators, parents, admissions officers and prospective employers to be assured that the learners are progressing according to an accepted standard (douglas, 2010). the problems currently facing language testers have both practical and theoretical implications but the first i...
Deep sea sedimentation
An important problem in the study of microparticles in the marine environment, suspended in the water column or deposited as sediment on the ocean bottom, is the determination of provenance of the microparticles-where did they come from and by what processes were they transported to the sampling location? Two techniques of possible interest to those concerned with tracing the origins and disper...
متن کاملSedimentation, bioturbation, and Hg uptake in the sediments of the estuary and Gulf of St. Lawrence
Sedimentation rates and mixing depths have been estimated from the application of a two-layer biodiffusion model to 210Pb profiles in sediment cores collected in the Laurentian Trough in the Estuary and Gulf of St. Lawrence. Sedimentation rates decrease exponentially with distance seaward from 0.70 cm yr21 (0.47 g cm22 yr21) near the head of the Trough to 0.04 cm yr21 (0.03 g cm22 yr21) in the ...
متن کاملEvaluation of Natural Radionuclide content in Nile River Sediments and Excess Lifetime Cancer Risk Associated with Gamma Radiation
Introduction: This Study has was carried out to measure and detect the natural occurred radionuclide content including 226Ra, 232Th and 40K in the Nile River sediments at various locations in Upper Egypt, from Aswan to El-Minya. Additionally, we determine the absorbed dose rate, the annual effective dose equivalent, and excess lifetime cancer risk also has been calculated. Material and Metho...
متن کاملLate-Pleistocene Climates and Deep-Sea Sediments.
Reports Renal Transport of p-Aminohippurate Labeled with Oxygen-18: J. V. Taggart ................................................... 401 Method of Preparing Radioactive Cations for Tracing Ground Water: W. J. Lacey and W. de Laguna ....... ............................ 402 Inhibition of Yeast Hexokinase by Fluoride Ion: N. C. Melchior and J. B. Melchior ...... ........................... 402 Au...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 1986
ISSN: 0016-7002
DOI: 10.2343/geochemj.20.29