PIXE microprobe for geoscience applications

Meijer, Jan; Stephan, A.; Adamczewski, J.; Bukow, H.H.; Rolfs, C.; Pickart, T.; Bruhn, Frank; Veizer, Ján

doi:10.1016/0168-583x(94)95178-0

Cited by 31 publications

(4 citation statements)

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“…The proton microprobe (PIXE) at the Dynamitron Tandem Laboratory of the Ruhr University, Bochum, was used for the trace element analyses (technical details in Meijer et al. , 1994; Götte, 2004).…”

Section: Methodsmentioning

confidence: 99%

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Götte¹,

Richter

2009

Sedimentology

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The cathodoluminescence analyses of the trigonal carbonates calcite and dolomite have been applied intensively in sedimentary petrology for a long time and the properties of these minerals are well-known, but much less attention has been paid to aragonite. In this study, the cathodoluminescence behaviour and the trace element composition of natural and synthetic aragonite have been studied employing trace element analyses (proton induced X-ray emission) and luminescence spectroscopy. Aragonite doped with Mn 2+ has been synthesized in a NH 4 + -Mg 2+ -Ca 2+ -Cl ) solution in contact with a CO 2 -H 2 O-NH 3 atmosphere. The low effective distribution coefficients indicate a rapid growth of the crystals of millimetre size which occurred within hours or days. The natural aragonite samples contain Mn, Fe and Sr in different concentrations. The Mn-bearing aragonites exhibit a bright green luminescence which is caused by a strong emission band at 575 nm with a half-width of about 84 nm. The luminescence intensity shows a strong positive correlation with Mn in aragonite when Fe and Mn do not exceed 2000 p.p.m. The intensity is depressed if the concentration of these elements exceeds the critical values. In the shell of a recent Unio sp., the luminescence intensity deviates from the linear correlation, although the trace element contents are not too high; this is probably an effect of quenching by organic material between the crystallites of the biogenic aragonite.

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Section: Methodsmentioning

confidence: 99%

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Götte¹,

Richter

2009

Sedimentology

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“…The PIXE analyses were made at the Dynamitron Tandem Laboratory (DTL) at the Ruhr-University with a highly focused proton beam (diameter 5 -10 mm) of 2 MeV energy (for technical details see Meijer et al, 1994). The GUPIX software package (Maxwell et al, 1995) was used for the quantitative evaluation of the X-ray spectra.…”

Section: Methodsmentioning

confidence: 99%

Quantitative high-resolution cathodoluminescence spectroscopy of smithsonite

Götte¹,

Richter²

2004

Mineral. mag.

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Five smithsonite samples from locations in Germany, Mexico and Namibia have been investigated with cathodoluminescence (CL) spectroscopy and trace-element analyses. As with other carbonates, the CL properties of smithsonite are mainly controlled by Mn 2+ -and Fe 2+ -incorporation, because these elements are the most important activator and quencher species, respectively. Additional trace elements may have either a quenching effect (Cu) or have only small or no influence (Ca, Pb). A linear correlation exists between the Mn content and the intensity of the Mn-emission band in smithsonite, which can be quantified, if the Cl intensity is related to the number of moles of Mn rather than the weight fraction. A correlation between the Cl intensity and the Mn concentration, which is valid for all trigonal carbonates, is obtained from the published results of calcite, dolomite and smithsonite. Matrix effects due to the different chemical composition of the carbonate minerals seem to be of lesser importance.

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“…After the treatment, the polished sections were removed from the solution, rinsed repeatedly with doubly distilled water and air-dried. The proton microprobe investigation was performed using the Scanning Proton Microprobe facility of the Ruhr-University at Bochum/Germany [30]. The proton induced X-ray spectra were measured by means of a Si(Li)-detector (Ortec 7900T-655) with a 8 μπι Be-window mounted at an angle of 45 ° and connected to a computer-based data aquisition system.…”

Section: Methodsmentioning

confidence: 99%

Application of Proton Microprobe and ¹²C-Rutherford Backscattering Spectroscopy to the Identification of Hg(II)-Cations Sorbed by Granite Minerals

et al. 1998

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The sorption of Hg(II)-cations from aqueous solutions by the three main mineral constituents of granite (quartz, feldspar and biotite) was investigated using proton microprobe and ,2 C-RBS. The investigation also included batch-type sorption experiments using pulverized mineral crystals and 203 Hg-labelled solutions as well as high-resolution y-ray spectroscopy. The batch-type experiments as well as the microprobe elemental mappings and line-scans indicated that the phyllosilicate biotite shows the highest Hg(II)-cations uptake ability. On the other hand, the I2 C-RBS data showed that the framework silicates feldspar and quartz adsorb small amounts of Hg(II)-cations especially on their surface. The rock texture and the surface microtopography of the minerals seem to play a crucial role in the migration of Hg(II)-cations into the granite.

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PIXE microprobe for geoscience applications

Cited by 31 publications

References 3 publications

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Quantitative high-resolution cathodoluminescence spectroscopy of smithsonite

Application of Proton Microprobe and ¹²C-Rutherford Backscattering Spectroscopy to the Identification of Hg(II)-Cations Sorbed by Granite Minerals

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PIXE microprobe for geoscience applications

Cited by 31 publications

References 3 publications

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Quantitative aspects of Mn‐activated cathodoluminescence of natural and synthetic aragonite

Quantitative high-resolution cathodoluminescence spectroscopy of smithsonite

Application of Proton Microprobe and 12C-Rutherford Backscattering Spectroscopy to the Identification of Hg(II)-Cations Sorbed by Granite Minerals

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Application of Proton Microprobe and ¹²C-Rutherford Backscattering Spectroscopy to the Identification of Hg(II)-Cations Sorbed by Granite Minerals