Article history: Received 28 July 2015 Received in revised form 19 January 2016 Accepted 20 January 2016 Available online 26 January 2016 Monterey Bay, California (CA) receives nutrients from multiple sources, including river discharge, upwelling of deep water, and submarine groundwater discharge (SGD). Here we evaluate the relative importance of these sources to Northern Monterey Bay with a mi...

The uranium (238U) decay series provides the most important isotopes of elements radium (226Ra), radon (222Rn), and polonium (210Po) with half-lives of about 1600 years, 3.8 days, and 140 days, respectively. Although the chemical structure of radium is very similar to calcium, the fact that it produces a radioactive gas (radon) complicates its handling in the laboratory and natural environment....

Eleven soil samples from the new campus of Taif University and its neighboring areas, Saudi Arabia have been studied by high-resolution γ-ray spectroscopy, x-ray powder diffraction and Mössbauer spectroscopy to ascertain their overall characterization. The mean and range of the activity concentrations of 232 Th, 234 Th, 226 Ra, 40 K and 137 Cs isotopes in the soil samples are 1.68±0.2 (8.3 40.2...

Radium isotopes were used to determine the crustal residence times of hydrothermal fluids from two geothermal wells (Svartsengi and Reykjanes) from the Reykjanes Peninsula, Iceland. The availability of rock samples from the subsurface (to depths of 2400 m) allowed direct comparison of the radium isotopic characteristics of the fluids with those of the rocks within the high temperature and press...

Climate change is causing sea ice loss on Arctic continental shelves, resulting in increases of shelf-derived materials to the Ocean. Sediment-water interaction can chemically transform water as it moves across shelf, enriching shelf waters nutrients and carbon, which impact primary productivity greenhouse gas cycling. However, drivers sediment-water Ocean are poorly understood. In this study, ...

The Sudbury Neutrino Observatory experiment was built to measure the total flux of B solar neutrinos via the neutral current disintegration deuterium nuclei. This process can be mimiced by daughter isotopes of Th and U which can photodisintegrate the deuterium nucleus. Measurement of the concentration of such radioisotopes in the heavy water was critical to the success of the experiment. A radi...

This paper reports the preparation of sulphur polymer cements (SPCs) incorporating waste ilmenite mud for use in concrete construction works. The ilmenite mud raw material and the mud-containing SPCs (IMC-SPCs) were characterised physico-chemically and radiologically. The optimal IMC-SPC mixture had a sulphur/mud ratio (w/w) of 1.05 (mud dose 20 wt%); this cement showed the greatest compressive...