Determining Elemental Composition Using Prompt γ Activation Analysis

Révay, Zsolt

doi:10.1021/ac9011705

Cited by 157 publications

(80 citation statements)

References 27 publications

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“…Surface concentrations of Au and Ag were determined by X-ray photoelectron spectroscopy and intensities of the peaks in the gamma spectrum were determined with the Hypermet-PC [35] program, whereas the element identification and the calculation of the concentrations was done with the program ProSpeRo [36], utilizing our prompt-gamma analysis library [37]. Every step of the measurement and the evaluation can be described with statistical methods; therefore the uncertainties of the results can be readily estimated from a single measurement.…”

Section: Sample Characterizationmentioning

confidence: 99%

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

Benkó

Beck

Frey

et al. 2014

Applied Catalysis A: General

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SiO 2 supported Ag-Au bimetallic catalysts were prepared by sol adsorption method with 10/90, 20/80, 33/67, and 50/50 Ag/Au molar ratios. Reduction of HAuCl 4 in Ag sol resulted in alloyed AgAu colloid particles and that structure remained after calcination and reduction treatment. The alloy structure of the catalysts was confirmed by UV-visible spectroscopy and high resolution transmission electron microscopy. The Au-Ag bimetallic effect and its dependence on the Ag/Au molar ratio was studied in glucose oxidation where synergistic activity increase was observed compared to the Au/SiO 2 reference sample in case of the bimetallic samples with less than Ag/Au=50/50 molar ratio. The Ag/SiO 2 was inactive at the same conditions. The Ag/Au surface atomic ratios -calculated by X-ray photoelectron spectroscopy (XPS) -were slightly higher than in the bulk -determined by prompt gamma activation analysis (PGAA). The higher activity of the bimetallic samples is suggested to be caused by the improved O 2 activating ability provided by Ag sites. The further increase of Ag loading above the optimal concentration may dilute or cover the Au to such an extent that the number of gold ensembles necessary for glucose activation decreases deteriorating the activity.

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Section: Sample Characterizationmentioning

confidence: 99%

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

Benkó

Beck

Frey

et al. 2014

Applied Catalysis A: General

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“…The Evaluated Gamma-ray Activation File (EGAF) [1] is a coordinated research project of the International Atomic Energy Agency (IAEA) used in Prompt Gammaray neutron Activation Analysis (PGAA) for the determination of the elemental compositions of materials [2]. The data in the EGAF consist of capture γ-ray production cross sections (σ γ ) which were initially measured using natural elemental targets.…”

Section: Introductionmentioning

confidence: 99%

Investigation ofRe186via radiative thermal-neutron capture onRe185

et al. 2016

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Partial γ-ray production cross sections and the total radiative thermal-neutron capture cross section for the 185 Re(n, γ) 186 Re reaction were measured using the Prompt Gamma Activation Analysis facility at the Budapest Research Reactor with an enriched 185 Re target. The 186 Re cross sections were standardized using well-known 35 Cl(n, γ) 36 Cl cross sections from irradiation of a stoichiometric nat ReCl3 target. The resulting cross sections for transitions feeding the 186 Re ground state from low-lying levels below a cutoff energy of Ec = 746 keV were combined with a modeled probability of ground-state feeding from levels above Ec to arrive at a total cross section of σ0 = 111(6) b for radiative thermal-neutron capture on 185 Re. A comparison of modeled discrete-level populations with measured transition intensities led to proposed revisions for seven tentative spin-parity assignments in the adopted level scheme for 186 Re. Additionally, 102 primary γ-rays were measured, including 50 previously unknown. A neutron-separation energy of Sn = 6179.59(5) keV was determined from a global least-squares fit of the measured γ-ray energies to the known 186 Re decay scheme. The total capture cross section and separation energy results are comparable to earlier measurements of these values.

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“…The quantitative analysis was based on our PGAA library (Révay et al 2004) using the HYPERMET PC spectrum fitting software (Révay et al 2005, Révay 2009) and the ProSpeRo 3.2.4 software package used for calculation of elemental concentrations and their uncertainties. With PGAA, we were able to quantify all the major components, such as SiO 2 , TiO 2 , Al 2 O 3 , the total iron oxide, expressed as Fe 2 O 3 , MnO, CaO, Na 2 O, K 2 O, and the total H 2 O.…”

Section: Resultsmentioning

confidence: 99%

“…The basic metrical data on the cores are summarised on The size and beauty of the exceptional pieces exclude any invasive analysis. Fortunately, due to advantages of the non-destructive Prompt Gamma Activation Analysis (PGAA) analytical technique (Révay 2009), we are able to quantify major chemical components and some key trace elements of stone artefacts with adequate accuracy. The compositional data obtained by PGAA helps us to successfully determine provenance of obsidian , 2006Kasztovszky et al 2008).…”

Section: The Objectsmentioning

confidence: 99%

Prompt Gamma Activation Analysis of the Nyírlugos obsidian core depot find

Kasztovszky

Biró

Kis

2014

JLS

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Abstract:The Nyírlugos obsidian core depot find is one of the most important lithic assemblages in the collection of the Hungarian National Museum (HNM). The original set comprised 12 giant obsidian cores, of which 11 are currently on the permanent archaeological exhibition of the HNM. One of the cores is known to be in Debrecen. The first publication attributed the hoard, on the strength of giant (flint) blades known from the Early and Middle Copper Age Tiszapolgár and Bodrogkeresztúr cultures, to the Copper Age. In the light of recent finds it is more likely to belong to the Middle Neolithic period. The source area was defined as Tokaj Mts., about 100 km to the NW from Nyírlugos. The size and beauty of the exceptional pieces exclude any invasive analysis. Using Prompt Gamma Activation Analysis (PGAA), we can measure major chemical components and some key trace elements of stone artefacts with adequate accuracy to successfully determine provenance of obsidian. Recent methodological development also facilitated the study of relatively large objects like the Nyírlugos cores. The cores were individually measured by PGAA. The results show that the cores originate from the Carpathian 1 sources, most probably the Viničky variety (C1b). The study of the hoard as a batch is an important contribution to the assessment of prehistoric trade and allows us to reconsider the so-called Carpathian, especially Carpathian 1 (Slovakian) sources.

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Determining Elemental Composition Using Prompt γ Activation Analysis

Cited by 157 publications

References 27 publications

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

Investigation ofRe186via radiative thermal-neutron capture onRe185

Prompt Gamma Activation Analysis of the Nyírlugos obsidian core depot find

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