Exploration of a landlocked cenote on Lifou (Loyalty Islands) revealed 37 shells of the cephalopod Nautilus macromphalus Sowerby, 1849, in saltwater on the cenote floor, approximately 40 m below the water surface. The occurrence of these shells is unusual because N. macromphalus is restricted to the open marine waters surrounding the island. All of the shells are mature, and nearly all of them ...

The Brazilian phosphate fertilizer is obtained by wet reaction of igneous phosphate rock with concentrated sulphuric acid, giving as final product, phosphoric acid and dehydrated calcium sulphate (phosphogypsum) as by-products. Phosphoric acid is the starting material for triple superphosphate (TSP), single superphosphate (SSP), monoammonium phosphate (MAP) and diammonium phosphate (DAP). The p...

The radioactivity in tobacco leaves collected from 15 different regions of Greece and before cigarette production was studied in order to find out any association between the root uptake of radionuclides from soil ground by the tobacco plants and the effective dose induced to smokers from cigarette tobacco due to the naturally occurring primordial radionuclides , such as 226Ra and 210Pb of the ...

An important pathway for CO2 sinking in the ocean is via “biological pump”, driven by production of particulate organic carbon (POC) surface and its subsequent export to deeper vertical settling. Here we examine fluxes POC continental slope northern Gulf Mexico utilizing short-lived radionuclide pair 210Po - 210Pb. The total activities 210Pb ranged from 2.5 ± 0.35 16.52 1.98 dpm 100 L-1 3.47 0....

The study of the 222Rn terrestrial flux (Bq/(m2·s) or Bq/(m2·h)) is a complex issue involving both radiation-protection and environmental aspects. While aspects are quite obvious—it has been well known for several decades that soil major source indoor radon—environmental issues such as correlation with conventional pollutants (PM2.5, PM10, NOX, etc.) use radon esmation natural component GHG (CO...

High concentrations of natural radionuclides in building materials can result in high dose rates indoors, from both internal and external exposure. In dose calculations, the main radionuclides of interest are 226Ra, 232Th and 40K. Usually much attention is paid to 226Ra due to 222Rn exhalation and the subsequent internal exposure. Other radionuclides of the uranium series such as 238U and 210Pb...

An assessment has been made of the association of (239+240)Pu, 241Am and 210Po (in secular equilibrium with 210Pb) with iron minerals using a magnetic extraction technique. Grab samples of beach sand from the Cumbrian (UK) coastline were subjected to successive extractions with an approximately 0.1 T ferrite magnet and an approximately 0.3 T rare-earth magnet procedure to separate magnetic iron...

PURPOSE To study geographical variations in the level of naturally occurring 210Pb-supported 210Po in permanent teeth of juveniles in the UK. MATERIALS AND METHODS Permanent teeth extracted from 278 juveniles for orthodontic purposes were obtained from 48 counties in the UK. 210Po activity concentration was measured on the outer enamel surface using TASTRAK alpha-particle-sensitive plastic tr...

The Middle East is a hot spot of dust, and there are reports as much 1400 µg m−3 dust in aerosols from Kuwait, which among some the highest loadings globally. A significant volume literature has emerged on dust–air-quality–human-health, World Health Organization its recent air quality guidelines lowered limit annual PM2.5 exposure to 5 μg previous 10 m−3. We present mini-review based screening ...

This analysis of 238U, 226Ra and 210Pb transfer factors from the soil to leaves different native broadleaf trees at sites previously modified by uranium presence site background radioactivity levels, was conducted using data a few available studies literature. The tree species Quercus ilex, suber, Eucalyptus camaldulensis, pyrenaica, ilex rotundifolia, Populus sp. botryoides Sm. affected Tilia ...