rhenium concentration low
Elution of Re-188 from W-188/Re-188 generators with salts ...
QMA elution with 0.9% NaCl, provides Re-188 perrhenate solution in <1 mL. Concentration of 10-20 mL of Re-188 solution (> 15 BGq) in <1 mL has been demonstrated using this simple new approach, which is also effective for concentration of Tc-99m from low specific activity Mo-99 (n,y) generators.
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Rhenium-188: Availability from the W-188/Re-188 Generator ...
Rhenium-188 is one of the most readily available generator derived and useful radionuclides for therapy emitting - particles (2.12 MeV, 71.1% and 1.965 MeV, 25.6%) and imageable gammas (155 KeV, 15.1%). The 188W/188Re generator is …
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Rhenium - an overview | ScienceDirect Topics
Using the same type of arguments used for tungsten, the very low concentration of crustal rhenium but relatively high sea water concentration (sea water rhenium and tungsten are nearly identical, but crustal tungsten is ∼3000 times more abundant than rhenium) suggests that rhenium is very unreactive in the entire ocean system.
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Rhenium concentration in Australian molybdenites by stable ...
Rhenium concentration in Australian molybdenites 1497 However, an exception is noted for the molybdenite from the rich copper lodes of the Yelta Mine, Moonta (sample 34) which contain a particularly low concentration of rhenium. Reference to Fig. 2 and Table 2 indicates that a temporal distribution of rhenium rich molybdenite is not evident.
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Nitrogen concentration driving the hardness of rhenium ...
The structures and properties of rhenium nitrides are studied with density function based first principle method. New candidate ground states or high-pressure phases at …
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Materials | Free Full-Text | Treatment of Rhenium ...
An increase in rhenium concentration in solution promotes its sorption by yeast biomass. In three systems, namely Re, Re-Cu, and Re-Mo, biosorption capacity increased on average from 0.6 to 5.0 mg/g as the rhenium concentration rose, while in the Re-Mo-Cu system the increase in sorption capacity was lower, ranging from 0.7–2.9 mg/g.
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Study of the Possibility of Rhenium Extraction and ...
extracted by hot ethanol, its concentration increases from 110 μg/g in the raw leaves up to 24 444 μg/g аsh, i. e. 222 times. This dependence is in accordance with the reduction of the ash weight against the plant mass. If we retrace the increase of rhenium concentration from soil to raw leaves and from raw
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On the uptake of rhenium by plants: Accumulation and ...
Rhenium concentration and Re (%) recovery from dry alfalfa leaves subjected to aqueous extractions with different volumes of distilled water (20, 30, 50 mL) and stirring times (5, 10, 30, 60 min). Values are presented as means of three replicates ±standard deviation.
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Investigation on the recovery of rhenium in the high ...
The rhenium concentration as well as Re(VII) and Mo(VI) separation from sulphuric and nitric–sulphuric acid solutions obtained after pyrometallurgical and nitric acid processing of rhenium ...
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Determination of rhenium content in molybdenite by ICP-MS ...
A simple and rapid analytical method for determining the concentration of rhenium in molybdenite for Re-Os dating was developed. The method used isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS) after the removal of major matrix elements (e.g., Mo, Fe, and W) from Re by solvent extraction with N-benzoyl-N-phenylhydroxylamine (BPHA) in chloroform solution.
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Adsorption and desorption properties for rhenium using a ...
Rhenium (Re) is a kind of rare metal with the second highest melting point of 3180 °C in periodic table. Owing to its excellent physicochemical properties, rhenium plays an irreplaceable role in the fields of high-temperature alloys and hydrogenation catalysts [1,2,3,4,5].Since a low amount of independent rhenium ore deposits exists, most rhenium resource is distributed within the …
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Crystallization of Rhenium Salts in a Simulated Low ...
This study presents the characterization of salt phases that formed on simulated low-activity waste glass melts during a rhenium solubility study. This study with rhenium salts is also applicable to real applications involving radioactive technetium salts.
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Nipponium as a new element (Z = 75) separated by the ...
Barium and strontium usually come from sandy materials. (Light elements such as calcium and silicon are omitted in the present analysis.) Both crucibles contained mercury, suggesting that an amalgamation technique was adopted by the user. No rhenium was detected probably because of the very low concentration of this element in iridosmin. 27)
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Frontiers | Rhenium-188 Labeled Radiopharmaceuticals ...
Rhenium-188 (188Re) is a high energy beta-emitting radioisotope with a short 16.9 h physical half-life, which has been shown to be a very attractive candidate for use in therapeutic nuclear medicine. The high beta emission has an average energy of 784 keV and a maximum energy of 2.12 MeV, sufficient to penetrate and destroy targeted abnormal tissues. In addition, the low-abundant gamma ...
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Elution of Re-188 from W-188/Re-188 generators with salts ...
@article{osti_563343, title = {Elution of Re-188 from W-188/Re-188 generators with salts of weak acids permits efficient concentration to low volumes using a new tandem cation/anion exchange system}, author = {Guhlke, S and Clinic for Nuclear Medicine, Bonn and Beets, A L and Knapp, Jr, F F}, abstractNote = {Re-188, available from a W-188/Re-188 generator, is an important …
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Clean and deep separation of molybdenum and rhenium from ...
Clean and deep separation of molybdenum (Mo) and rhenium (Re) from the industrial solutions with ultra-low concentrations are extremely difficult. In current study, various low concentrations of Mo and Re are efficiently separated from the industrial solutions, including lixiviums, eluents and the waste waters, via vapidly stepwise selective coagulation and flocculation precipitation.
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Measurements of rhenium isotopic composition in low ...
Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. In particular, fractionation of its isotopes 187 Re (62.6% abundance) and 185 Re (37.4%) may be used to improve our understanding …
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Rhenium - 3D Elements
Tungsten-rhenium alloys are more ductile at low temperature, allowing them to be more easily machined. The high-temperature stability is also improved. The effect increases with the rhenium concentration, and therefore tungsten alloys are produced with up …
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Rhenium - Wikipedia
Tungsten-rhenium alloys are more ductile at low temperature, allowing them to be more easily machined. The high-temperature stability is also improved. The effect increases with the rhenium concentration, and therefore tungsten alloys are produced with up …
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A Simple ICP-MS Method for the Determination of Rhenium in ...
The rhenium concentration was determined using the integrated peak area through interpolation of standard addition calibration curves. ... low Re concentration was added by river waters from Japan ...
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Concentration Ratio Definition
The concentration ratio, in economics, is a ratio that indicates the size of firms in relation to their industry as a whole. Low concentration ratio in an industry would indicate greater ...
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Dosimetry and Therapeutic Ratios for Rhenium-186 HEDP
Rhenium-186 (Re-186) is a β -emitting radionuclide. Emitted β -particles have ranges up to 4.5 mm in tissue, capable of delivering high doses to skeletal regions of high Re-186 concentrations while sparing adjacent radiosensitive regions and thus making the irradiation well tolerated for the patient. Along with the >β-emissions, γ-rays are emitted having an adequate ...
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(IUCr) Formation of a highly dense tetra-rhenium cluster ...
Based on the conditions used during crystallization in this article and a half life of around one year under the conditions studied (Re 1 concentration = 30 m M) the t 1/2 can be reduced to less than a day (∼7 h) by increasing the rhenium concentration by one order of magnitude. Although not necessarily viable under protein crystallization ...
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Rhenium Alloys: White papers and technical literature
Adding rhenium to molybdenum increases the ductility as the rhenium concentration increases. The primary deformation mechanism of Mo47.5 Re alloys is twinning. Twinning occurs during cold and warm working, enhancing the mechanical properties without sacing ductility yet maintaining good strength at elevated temperatures.
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Determination of Silver, Cadmium, Indium, Tantalum ...
Determination of Silver, Cadmium, Indium, Tantalum, Rhenium, Gold, and Rare Earths at Low Concentration by Neutron Activation and Radiochemical Analysis. C. E. Gleit ... The determination of rhenium in molybdenite concentrates by instrumental neutron activation analysis with californium-252 as neutron source. ... gallium and germanium ...
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Clean and deep separation of molybdenum and rhenium …
Clean and deep separation of molybdenum (Mo) and rhenium (Re) from the industrial solutions with ultra-low concentrations are extremely difficult. In current study, various low concentrations of Mo and Re are efficiently separated from the industrial solutions, including lixiviums, eluents and the waste waters, via vapidly stepwise selective ...
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Platinum‐Group Element and Rhenium Concentrations in …
GEOSTANDARDS and Vol. 28 — N° 2 07 p.233-250 GEOANALYTICAL 04 RESEARCH Platinum-Group Element and Rhenium Concentrations in Low Abundance Reference Materials Thomas Meisel* and Johann Moser General and Analytical Chemistry, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria * Corresponding author. e-mail: thomas.meisel ...
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Recover Rhenium by Solvent Extraction
Recovery of rhenium by solvent extraction can be considered to be a two step process involving concentration of a low grade highly contaminated dilute feed to a relatively pure concentrated feed, and final purification and refining of medium grade concentrated feed to the desired level for crystallization. Alamine 336, a long chain tertiary amine.
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Low MCHC: Causes, Symptoms, Treatments
MCHC is the average concentration of hemoglobin in your red blood cells. Find out how a low MCHC level is diagnosed and what conditions it may point to.
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(PDF) Diffusion of Iodine and Rhenium in Category 3 Waste ...
The release of iodine and rhenium at 4% moisture content initiated with an initial spike in concentration in the sediment immediately contacting the concrete monolith. The concentration profile rapidly decreased to zero within the first 5 cm of the sediment profile (Figure 3-2 -Figure 3-5).
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