Surface assisted laser desorption ionization mass spectrometry (SALDI-MS) has been recognized as one of the prominent techniques in analysis small molecules well large nonvolatile since it bears many advantages compared to matrix spectrometry. The use SALDI-MS increasing for with development new substrates materials such porous silicons and nanomaterials. While most researches about are focusing on substrate materials, not much works done verification mechanism SALDI-MS. In this article, we...

The correlation of the isotopic composition uranium, plutonium, neodymium, and cesium with burnup for high pressurized water reactor fuels irradiated in nuclear power reactors has been experimentally investigated. total was determined by Nd-148 fractional 235U U Pu mass spectrometric methods. compositions U, Pu, Nd, Cs after their separation from fuel samples were measured using thermal ionization spectrometry. contents these elements through an isotope dilution method 233U, 242Pu, 150Nd,...

Abstract The chemical speciation of aqueous plutonium species has been performed by spectrophotometry. main focus was concentrated on the effect Pu(V) produced reduction Pu(VI) stability hydrolysis species. In order to detect trace amounts PuO 2 + ions, a liquid waveguide capillary cell with an optical path length 100 cm connected spectrophotometer. As consequence improved detection sensitivity, absorption band at 569 nm being indicative observed within one day after sample preparation from...

A long-lived radioisotope of iodine, 129I, is a fission product and released into our environment by spent nuclear fuel reprocessing plants or accidents. The measurements pertaining to 129I are focused on evaluating the effects using human-made products as environmental tracers for monitoring samples from various types matrices regulating radioactive contaminants waste repository safety. Thermal ionization mass spectrometry (TIMS), accelerator (AMS), inductively coupled plasma (ICP-MS) have...

Isotopic analysis using thermal ionization mass spectrometry coupled with scanning electron microscopy (SEMTIMS)was performed to determine the isotopic ratios of uranium contained in micro-particles 6th Nuclear SignaturesInterlaboratory Measurement Evaluation Programme (NUSIMEP-6) sample. Elemental by energy dispersive X-rayspectroscopy (EDS) was conducted on uranium-bearing mirco-particles, which were transferred rhenium filaments for TIMSloading a micromanipulation system SEM. A...

The laser ablation/ionization time-of-flight mass spectrometry is applied to the isotopic analysis of solid samples using a home-made instrument. technique convenient for sample due onestep process vaporization and ionization samples. analyzed were lead, cadmium, molybdenum, ytterbium. To optimize analytical conditions technique, several parameters, such as energy, wavelength, size beam on surface, high voltages ion source electrodes varied. Low energy light was necessary obtain optimal...

As background significantly affects measurement accuracy and a detection limit in determination of the trace amountsof uranium, it is necessary to minimize impurities filaments used for thermal ionization mass spectrometry (TIMS). Wehave varied degassing condition such as heating currents duration times reduce backgrounds from filamentsprepared with zone-refined rhenium tape. The most efficient current time wasdetermined 3.5 A 60 min, respectively. TIMS combined isotope dilution...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-Resolved Photodissociation of the Molecular Ions Propyl Phenyl EthersGary H. Weddle, Robert C. Dunbar, Kyuseok Song, and Thomas Hellman MortonCite this: J. Am. Chem. Soc. 1995, 117, 9, 2573–2580Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://doi.org/10.1021/ja00114a021Request reuse permissionsArticle Views102Altmetric-Citations17LEARN ABOUT THESE METRICSArticle Views are...

A method is described for the determination of Po nuclides in a water sample. After were purified from interfering elements sample using manganese dioxide precipitation followed by solvent extraction method, deposited onto silver plate. large volume was effectively pretreated with method. To determine optimum conditions plating Po, effects pH, volume, temperature and time on deposition investigated hydrochloric acid solution. The applied to tap

Mass spectrometric analysis was carried out using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) for the precise and accurate determination of isotope ratios ultratrace levels uranium dissolved in 3% HNO 3 .We used certified reference material (CRM) 112-A at a trace level 100 pg/mL isotopic measurement.Multiple collectors were utilized simultaneous measurement isotopes to reduce signal uncertainty due variations ion beam intensity over time.Mass bias correction...

Abstract The formation constants of mononuclear hydrolysis species Pu(VI) were determined by absorption spectroscopy under carefully designed experimental conditions. In order to exclude the polynuclear species, concentration plutonium was diluted below 50 μM. To maintain oxidation state Pu(VI), NaOCl applied as an oxidant. trace amount Pu(V) monitored measurement redox potential and using a liquid waveguide capillary cell with optical path length 100 cm. molar coefficients (ε, M −1 cm )...

The analysis of nuclear materials and environmental samples is an important issue in safeguards forensics. An technique for safeguard has been developed the detection undeclared activities verification declared activities, while forensics to trace origins intended use illicitly trafficked or radioactive materials. In these two analytical techniques, mass spectrometry played role determining isotope ratio various nuclides, contents elements, production dates. These techniques typically...