Showing papers in "Journal of Environmental Radioactivity in 2007"

TL;DR: The thermodynamics of uranium(VI) ion/MOCZ system indicates the spontaneous and endothermic nature of the process and an increase in temperature resulted in a higher uranium loading per unit weight of the adsorbent.

TL;DR: Soils and food crops from a former tin mining location in a high background radiation area on the Jos-Plateau, Nigeria were collected and analyzed by gamma spectrometry to measure their contents of 40K, 238U and 232Th and Potassium-40 was found to contribute the highest activity in all the food products.

TL;DR: (210)Pb and (137)Cs dating methods were applied to intertidal sediments containing both fine and coarse-grained particles and also, anthropogenic Pb in order to establish sedimentation rates and historical trends in heavy metal input.

TL;DR: In several places, mining waste and low-grade uranium ore left on the surface contain radioactivity above regional background, and in the mining facilities where the radioactive ore was chemically extracted, mill tailings contain materials with elevated levels of radioactivity, up to 200 times the levels in unaffected soils of the region.

TL;DR: (210)Pb activities derived by alpha and gamma methods are shown to agree within counting error and there is also good agreement in the derived sediment accumulation rates, indicating inherent compatibility of analytical results based on alpha or gamma techniques.

TL;DR: The cross-validation analysis showed that in the case of spatially structured data, OK is a better interpolation method than IDW1 or IDW2 for the assessment of potential radioactive contamination and/or pollution.

TL;DR: Investigation of enhancement of radioactivity in freshwater ecosystems in Portugal concluded that current levels of enhanced radioactivity do not pose a significant radiological risk either to aquatic fauna or to freshwater fish consumers.

TL;DR: Measurements of (210)Po were carried out in various marine matrices and in seawater at several points along the French coast, over a period of 2 years (2003-2005), to contribute to a better knowledge of this element.

TL;DR: A monitoring of natural radioactivity in some bottled mineral waters produced in Italy revealed that uranium and radium concentrations do not reach the relevant recommended derived activity concentration (DWC), but one sample exceeds this value for infants.

TL;DR: The speciation of selenium in the water extracts indicated that selenate was reduced, may be under organic forms, in the rhizosphere soil.

TL;DR: Five salt marsh sediment cores from different parts of the Venice Lagoon were studied to determine their depositional history and its relationship with the environmental changes occurred during the past approximately 100 years, suggesting that variations in the phenomena causing flooding are short-term driving forces for variations in marsh accretion rate.

TL;DR: It was shown that ship traffic is highly influential to the harbour bathymetry and therefore the specific activities of the natural radionuclides and (137)Cs seem to be controlled by the ship traffic.

TL;DR: Comparisons between the ex situ and in situ measurements indicate equivalently distributed uranium in the surface soils and stream sediments, the source of which is likely attributed to the monazite belts that are known to exist in the area.

TL;DR: The seasonality of indoor Rn concentration measured in Austria is investigated as a function of other factors that influence indoors Rn, with higher Rn levels in winter.

TL;DR: Seasonal trends for both species are in good agreement with observations from German forests: increased mushroom ingestion leads to higher (137)Cs T(ag)-values for roe deer in the second half of the year (August-December) compared to the first half (January-July).

TL;DR: To assess the radiological hazard of natural radioactivity in the samples, absorbed gamma dose rates in air, radium equivalent activity, representative level index, external hazard index and internal hazard index associated with the radionuclides were calculated and compared with internationally recommended values.

TL;DR: This experiment illustrates how small differences in the location and geometry of a tunnel can lead to vastly different behaviours of the radon concentration versus time, and has consequences for the estimation of the dose rate and the practicability of radon monitoring for tectonic purposes in underground environments.

TL;DR: A good correlation was obtained between the (222)Rn exhalation and (226)Ra activity, porosity and density of soil, and the activity concentrations of natural radionuclides in the mentioned zones have been determined.

TL;DR: In this paper, the effects of exposure in vivo to radiation and subtoxic levels of aluminum (Al) and cadmium (Cd), alone or in combination, were investigated.

TL;DR: The dosimetry calculations showed that these four cities could be categorized as average natural radiation zones and the correlation coefficients relating warm and cold season radon variation data were obtained.

TL;DR: The present status on advanced techniques is summarized and historical sources that have contributed to radioactive particle contamination are presented.

TL;DR: The recently completed Chernobyl Forum concluded that after a number of years, along with reduction of radiation levels and accumulation of humanitarian consequences, severe social and economic depression of the affected regions and associated psychological problems of the general public and the workers had become the most significant problem to be addressed by the authorities.

TL;DR: Tritium levels in the groundwaters and in the Rhône waters correspond to the regional tritium concentration in precipitation, and the data obtained for the terrestrial environment are in good agreement with the regional background and do not show any specific signature linked to the nuclear plant.

TL;DR: Levels of (129)I and (99)Tc in Fucus from the west coast were found to be enhanced with respect to levels in seaweeds from other regions in the Northern Hemisphere unaffected by discharges from nuclear installations such as those referred to.

TL;DR: The high values of indoor and outdoor radon concentrations found at Niska Banja make this region a high natural background radiation area.

TL;DR: The capabilities of some building materials used in Jordan to attenuate gamma radiation were tested and an empirical formula mu(m)=AE(-0.44) was proposed to calculate attenuation at various incident energies.

TL;DR: The three-dimensional atmospheric dispersion model DERMA is of Lagrangian type making use of a hybrid stochastic particle-puff diffusion description, capable of describing plumes at downwind distances greater than about 20km and up to the global scale.

TL;DR: The radiological impact assessment in three selected areas of elevated natural radioactivity in Greece is attempted, based on measurements, theoretical relations, and simple model application, to determine the discrete zones of impact of ionizing radiation.

TL;DR: Lake sediments can be considered as the "diary" of the lake: new layers are continuously deposited on top of the sediments, and the migration behavior of radionuclides, particularly of (137)Cs, can be analyzed by modeling the input into and the vertical distribution within the sediment.

TL;DR: The enhancement of NORM in effluent sediments as a consequence of amang processing, and the use of a closed water management recycling system created Effective Dose Rates, E (nSv h(-1), that signal potential environmental radiological risks in these ponds, should they be reclaimed for future land use.