An extensive programme was successfully carried out during the 1995 to 1998 NMS programme to recalibrate and model by Monte Carlo simulations the characteristics of two NPL long counters that are routinely used to standardise neutron fluences [Ta98,Ta00] for neutron energies above 500 keV. The present work is a continuation of it in that the counters responses and effective centres have been me...

The mineral sphalerite (Zn,Fe)S has been characterized by a combination of X-ray diffraction, EPR and NIR spectroscopy. The optical absorption spectrum of mineral sphalerite is due to an iron impurity only, which is in a distorted octahedral environment. The g=2.2 is attributed to iron and g and A value observed in the spectrum 1.999 and 6.0 mT are assigned to Mn(II) impurity in the mineral. Th...

In the present work, a novel biopolymer approach has been made to electrodeposit manganese dioxide from manganese sulphate in a sulphuric acid bath containing chitosan in the absence and presence of glutaraldehyde as a cross-linking agent. Galvanostatically synthesised electrolytic manganese dioxide (EMD) nanoflakes were used as electrode materials and their electrochemical properties with the ...

In the sedimental organic matter of eutrophic continental seas, such as the largest dead zone in the world, the Baltic Sea, bacteria may directly participate in nutrient release by mineralizing organic matter or indirectly by altering the sediment's ability to retain nutrients. Here, we present a case study of a hypoxic sea, which receives riverine nutrient loading and in which microbe-mediated...

In the Dusina area, which is built up of Lower Palaeozoic metasediments, Devonian carbonate complex and Upper Palaeozoic metarhyolites unconformably overlain by Upper Permian sediments, numerous ore occurrences have been investigated: (a) "stratabound" metamorphic hematite deposits in the pre-Devonian metasediments; (b) epigenetic veins and pipes of barite (& calcite) with accessory Hg-tetrahed...

The ability of aquatic plants to absorb, translocate and concentrate metals has led to the development of various plant-based treatment systems. The potential to accumulate metals like iron, nickel, manganese and copper by Trapa bipinosa was assessed by subjecting them to different effluent concentrations of pulp and paper industry under laboratory conditions. Trapa showed the ability to accumu...

This study evaluated the co-remediation performance of an active–passive process comprised passive permeable reactive barrier acid mine drainage (AMD) pre-treatment and active anaerobic digestion treatment AMD with effluent as a carbon source. The bioreactor was operated for 24 consecutive days peak chemical oxygen demand (COD) sulphate loading rates 6.6 kg COD/m3/day 0.89 SO42−/m3/day, respect...

The systematic evaluations of spectrum averaged cross sections dosimetric reactions over a broad range energies were performed in 252 Cf (spontaneous fission) and 235 U(n th ,f) neutron fields. sources used this study LR-0, VR-1 zero power research light water reactors, LVR-15 10 MW reactor, source with emission specified precisely by the manganese sulphate bath. All spectral inferred from meas...