نتایج جستجو برای: 228ra
تعداد نتایج: 109 فیلتر نتایج به سال:
Radionuclides and heavy metals/metalloids content in soils shore sediments of Al-Negila area (Matrouh, Egypt) were determined to assess the associated environmental risks. A total 46 soil sediment samples collected analysed for natural man-made radionuclides (238U series, 232Th 40K 137Cs) (Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Mn, Ni, Si, Sr, Zn, Hg). Within study area, are mainly calcareous with ...
Radioactive materials which occur naturally and expose people to radiation widely, are known by the acronym 'NORM'. Exposure NORM is often increased human activities, eg burning coal, making using fertilisers, oil gas production.
 Many natural contain radioactive elements (radionuclides). The earth's crust constantly leaks radon into our atmosphere. However, while level of individual expos...
Results of groundwater and seawater analyses for radioactive (3H, 222Rn, 223Ra, 224Ra, 226Ra, and 228Ra) and stable (D and 18O) isotopes are presented together with in situ spatial mapping and time series 222Rn measurements in seawater, direct seepage measurements using manual and automated seepage meters, pore water investigations using different tracers and piezometric techniques, and geoelec...
Presented here is the first detailed geochemical data set on the U/Th series Th, Pa, AC, and Pb isotopes and artificial fallout radionuclides (90Sr, 137Cs and Pu isotopes), and some trace elements (V, Zn, Cd, Cu, Mn, and Ni ) in two water , columns of the Jap;an and Bonin trenches down to the bottom depths of 7585 m and 9750 m, respectively. Hydrographic properties such as tlemperature, salinit...
We used the natural geochemical tracers radon-222 and radium isotopes (223Ra, 224Ra, 226Ra, 228Ra) to assess exchange rates between the Chao Phraya River and the Gulf of Thailand, and the magnitude of groundwater discharge in the estuary. We performed tracer surveys during two periods in 2004, in January (dry season, gauged river discharge 47 m3 s21) and in July (wet season, 430 m3 s21). The is...
We used two short-lived radium isotopes (223Ra, 224Ra) and a mass balance approach applied to the radium activities to determine the nutrient contribution of saline submarine groundwater discharge to the coastal waters of the northern Gulf of Aqaba (Israel). Radium isotope activities were measured along transects during two seasons at a site that lacked any obvious surficial water input. An ons...
We investigated the role submarine groundwater discharge (SGD) plays in the delivery of nutrients and copper to the Elizabeth River (Virginia) estuary, a major subestuary of lower Chesapeake Bay. Using an approach based on radium isotopes, we concluded that two distinct sources of groundwater were equally impacting the estuary: a surface (marsh) aquifer and deep aquifer source each with a uniqu...
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