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Michael Descostes - One of the best experts on this subject based on the ideXlab platform.
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field analyses of 238 u and 226 ra in two uranium mill tailings piles from niger using portable hpge detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Michael DescostesAbstract:Abstract The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMAIR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
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Field analyses of 238U and 226Ra in two uranium mill tailings piles from Niger using portable HPGe detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Radia Sia, Michael DescostesAbstract:The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMA€IR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
Adrien Dejeant - One of the best experts on this subject based on the ideXlab platform.
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field analyses of 238 u and 226 ra in two uranium mill tailings piles from niger using portable hpge detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Michael DescostesAbstract:Abstract The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMAIR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
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Field analyses of 238U and 226Ra in two uranium mill tailings piles from Niger using portable HPGe detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Radia Sia, Michael DescostesAbstract:The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMA€IR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
Yuichi Setsuhara - One of the best experts on this subject based on the ideXlab platform.
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interface structure of microcrystalline silicon deposited by Inductive Coupled Plasma using internal low inductance antenna
Surface & Coatings Technology, 2008Co-Authors: Hirokazu Kaki, Atsushi Tomyo, Eiji Takahashi, Tsukasa Hayashi, Kiyoshi Ogata, Akinori Ebe, Kosuke Takenaka, Yuichi SetsuharaAbstract:Abstract Hydrogenated microcrystalline silicon (µc-Si:H) films were prepared by Inductive Coupled Plasma chemical vapor deposition (ICP-CVD) system using internal low inductance antenna (LIA) units on various under layer composed of Si, O, and N. The resultant changes in the crystallinity of the µc-Si:H films were investigated using Raman scattering spectroscopy and the details of the interface structure were observed by high resolution transmission electron microscope. We had found that µc-Si:H film on the SiN x layer treated by O 2 Plasma has good interface quality. The highly crystallized µc-Si:H films with no amorphous incubation layer at interface of Si/SiN x could be directly deposited on the SiN x layer.
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large area and high speed deposition of microcrystalline silicon film by Inductive Coupled Plasma using internal low inductance antenna
Japanese Journal of Applied Physics, 2007Co-Authors: Eiji Takahashi, Hirokazu Kaki, Atsushi Tomyo, Tsukasa Hayashi, Kiyoshi Ogata, Akinori Ebe, Yasuaki Nishigami, Masaki Fujiwara, Kiyoshi Kubota, Yuichi SetsuharaAbstract:A novel Inductively-Coupled RF Plasma source with internal low-inductance antenna (LIA) units was developed to synthesize microcrystalline silicon (µc-Si) film on a large glass substrate. A film thickness profile on a 600×720 mm2 glass substrate was achieved with high Plasma uniformity and a variation of less than ±5% without a standing-wave effect. Raman and transmission electron microscope (TEM) analysis revealed that highly crystallized µc-Si films, which were directly deposited on a glass substrate, were synthesized without an amorphous-phase incubation layer at the substrate interface. A bottom-gate thin-film transistor (BG-TFT) was fabricated employing an optimized µc-Si layer and exhibited a field-effect mobility of 3 cm2/(Vs), which is one order higher than that of a typical amorphous silicon TFT.
Dietmar Fuchs - One of the best experts on this subject based on the ideXlab platform.
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determination of silicon in urine by Inductive Coupled Plasma optical emission spectroscopy
Clinica Chimica Acta, 1998Co-Authors: Bernhard Widner, Albert Mirlach, Arno Hausen, Ilse Jenewein, Dieter Jenewein, Manfred P Dierich, Helmut Wachter, Dietmar FuchsAbstract:Abstract We describe an Inductive Coupled Plasma-optical emission spectroscopic method to determine silicon in spot urine specimens. A 6-fold standard addition series of the urine specimen ranging from 0 to 356 μmol/l silicon was applied, and the method meets the requirement of matrix compensation in a frequently changing environment. The inter-assay variation was ±3.0%, intra-assay variations for three specimens were ±1.7%, ±1.1% and ±0.84%. To compensate for physiological variations of urine density, the silicon concentrations in urine were related to urinary creatinine which was measured in parallel by reversed-phase HPLC. Urinary silicon concentrations were examined in 43 healthy controls from the local population. The 5th–95th percentile was 12.6–237 μmol/mmol creatinine. A follow-up of three people over a period of 14 days showed that intra-individual variations of urinary silicon concentrations were smaller than variations between individuals, especially when silicon is related to creatinine.
Georges Calas - One of the best experts on this subject based on the ideXlab platform.
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field analyses of 238 u and 226 ra in two uranium mill tailings piles from niger using portable hpge detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Michael DescostesAbstract:Abstract The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMAIR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
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Field analyses of 238U and 226Ra in two uranium mill tailings piles from Niger using portable HPGe detector
Journal of Environmental Radioactivity, 2014Co-Authors: Adrien Dejeant, Ludovic Bourva, Laurence Galoisy, Georges Calas, Vannapha Phrommavanh, Radia Sia, Michael DescostesAbstract:The radioactivities of 238U and 226Ra in mill tailings from the U mines of COMINAK and SOMA€IR in Niger were measured and quantified using a portable High-Purity Germanium (HPGe) detector. The 238U and 226Ra activities were measured under field conditions on drilling cores with 600s measurements and without any sample preparation. Field results were compared with those obtained by Inductive Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and emanometry techniques. This comparison indicates that gamma-ray absorption by such geological samples does not cause significant deviations. This work shows the feasibility of using portable HPGe detector in the field as a preliminary method to observe variations of radionuclides concentration with the aim of identifying samples of interest. The HPGe is particularly useful for samples with strong secular disequilibrium such as mill tailings.
