Oxygen deficient zones (ODZs) are regions in the marine water column where concentration of oxygen is very low or zero and respiration occurs using nitrate as terminal electron acceptor. Under such conditions, iron (Fe) would be predicted to +3 valence state, its geochemistry largely unaffected by absence oxygen. In contrast, observations show that Fe(II) a major sometimes dominant oxidation st...

The approach taken in the WHO Guidelines for controlling radiological hazards public water supplies has two stages. first is an initial screening gross alpha and beta activity to determine whether concentrations are below levels at which no further action required; if these exceeded, investigation of concentration individual radionuclides comparison with specific guidance levels. Mineral obtain...

  ABSTRACTBackground : The presence of primordial radionuclide in human habitats has always been a source of prolonged exposure. Measurement of naturally occurring radionuclides in the environment can be used as baseline to evaluate the impact of non-nuclear activities and also routine releases from nuclear installations.   Materials and methods: A total of 56 samples from 18 different foodstuf...

Ra, Ra and Ba distributions as well as Ra/Ra and Ra/Ba ratios were measured in seawater, suspended and sinking particles at the DYFAMED station in the Western Mediterranean Sea at different seasons of year 2003 in order to track the build-up and fate of barite through time. The study of the Raex/ Raex ratios (Raex = Ra activities corrected for the lithogenic Ra) of suspended particles suggests ...

Scales and sludge are commonly formed during oil and gas extracting and processing operations. They usually appear when injection and formation water with different chemical characteristics come into contact. When the produced water is brought to the surface alongside with the oil, a precipitate can be deposited on the walls of pipes and equipment, forming the so-called scales. Otherwise they c...

Flue gas desulfurization (FGD) waste is an industrial by-product generated during the flue process in coal-fired power plants. This contain trace quantities of naturally occurring radionuclides and elements such as As, Ba, Co, Cr, Zn. The characteristics FGD are important for its reuse mainly depend on process. In this work, two types materials collected from three plants using semi-dry wet pro...

The entrance of radionuclides to the human food chain together with ingestion favour tissues deposition throughout body, which may have long-term implications for radiation doses. That affects world population, since it represents approximately 12% annual effective dose received public. This contribution will be quite variable depending on habits, origin and background levels place residence. I...

abstractbackground : the presence of primordial radionuclide in human habitats has always been a source of prolonged exposure. measurement of naturally occurring radionuclides in the environment can be used as baseline to evaluate the impact of non-nuclear activities and also routine releases from nuclear installations.   materials and methods: a total of 56 samples from 18 different foodstuff ...