The NAC nuclear microprobe facility

Prozesky, V.M.; Przybyłowicz, W.J.; Achterbergh, E. van; Churms, C.L.; Pineda, C.A.; Springhorn, K.A.; Pilcher, J. V.; Ryan, C.G.; Kritzinger, J. J.; Schmitt, H.W.; Swart, T.

doi:10.1016/0168-583x(95)00581-1

Cited by 101 publications

(30 citation statements)

References 10 publications

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“…Polished and carbon-coated grain mounts of hand-selected sul®de crystals were analyzed using the nuclear microprobe of the National Accelerator Centre at Faure [11,12]. A 3 MeV proton beam was used, with beam diameters between 4 and 8 lm, and beam currents between 0.5 and 1.5 nA.…”

Section: Methodsmentioning

confidence: 99%

Micro-PIXE analysis of varied sulfide populations from the Ventersdorp Contact Reef, Witwatersrand basin, South Africa

Reimold¹,

Przybyłowicz²,

Koeberl³

1999

Nuclear Instruments and Methods in Physics Research Section B:

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Micro-PIXE spot analysis and true elemental imaging of pyrrhotite and pyrite crystals from the Ventersdorp Contact Reef (VCR) of the Witwatersrand basin, the world's most important gold resource, are reported. The objective was to evaluate the use of this technique with regard to its analytical resolution concerning the detection limits for the elements encountered in these samples and their spatial distribution. Furthermore, this project was designed to identify chemical signatures characteristic for particular textural types of VCR sul®des.Micro-PIXE is indeed a highly useful technique for the analysis of such materials and provided results that could not be obtained by optical and SEM microscopy and electron probe microanalysis (EPMA). Micro-inclusions could be made visible through elemental area scanning. Chemical zonation in the interior of apparently homogeneous grains was detected, which has obvious implications for the interpretation of the multi-stage evolution of Witwatersrand mineralization. The available data do not yet allow unambiguous chemical classi®cation of di erent sul®de types (generations), but a distinct late growth of As-enriched sul®de was detected. These late overgrowths may be enriched in Ni or not. No unambiguous relation between As and Au could be observed in these samples. Ó

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Section: Methodsmentioning

confidence: 99%

Micro-PIXE analysis of varied sulfide populations from the Ventersdorp Contact Reef, Witwatersrand basin, South Africa

Reimold¹,

Przybyłowicz²,

Koeberl³

1999

Nuclear Instruments and Methods in Physics Research Section B:

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“…Research Department, iThemba LABS [22][23][24]. A proton beam of 3.0 MeV energy, a current of ~100 pA and a spot size of 3 x 3 µm 2 was raster scanned, in two separate irradiation events, across a square-shaped area of ~2 mm 2 over the surface of the grain (n=2 per cultivar).…”

Section: Micro-pixe Analysismentioning

confidence: 99%

Micro-PIXE mapping of mineral distribution in mature grain of two pearl millet cultivars

Minnis‐Ndimba

Kruger

Taylor

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Micro-proton-induced X-ray Emission (micro-PIXE) was used to map the distribution of several nutritionally important minerals found in the grain tissue of two cultivars of pearl millet (Pennisetum glaucum (L.) R. Br.). The distribution maps revealed that the predominant localisation of mineral elements was within the germ (consisting of the scutellum and embryo) and the outer grain layers (specifically the pericarp and aleurone); whilst the bulk of the endosperm tissue featured relatively low concentrations of the surveyed minerals. Within the germ, the scutellum was revealed as a major storage tissue for P and K; whilst Ca, Mn and Zn were more prominent within the embryo. Fe was revealed to have a distinctive distribution pattern, confined to the dorsal end of the scutellum; but was also highly concentrated in the outer grain layers. Interestingly, the hilar region was also revealed as a site of high accumulation of mineral elements, particularly for S, Ca, Mn, Fe and Zn, which may be part of a defensive strategy against infection or damage. Differences between the two cultivars, in terms of the bulk Fe and P content obtained via inductively coupled plasma optical emission spectrometry (ICP-OES), concurred with the average concentration data determined from the analysis of micro-PIXE spectra specifically extracted from the endosperm tissue.

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“…The nuclear microprobe at the Materials Research Department of iThemba LABS, South Africa (Prozesky et al 1995;Przybyłowicz et al 1999), with the adapted cryotransfer system, was used to study quantitatively the distribution and concentrations of elements in the cryosections in frozen-hydrated state. The details of the cryosystem setup can be found elsewhere (Wang et al 2013;Tylko et al 2007a, b).…”

Section: Cryo-micro-pixe Analysismentioning

confidence: 99%

Elemental distribution by cryo-micro-PIXE in the zinc and cadmium hyperaccumulator Sedum plumbizincicola grown naturally

Wang

Przybyłowicz

et al. 2014

Plant Soil

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Background and aims The aim of this study was to determine Zn/Cd accumulation ability and cellular distribution in Sedum plumbizincicola from a mine area. Methods Spatial localization of S, Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn and Cd in frozen-hydrated sections of S. plumbizincicola was quantitatively determined using cryo-micro-PIXE. R e s u l t s T h e s h o o t s o f S . p l u m b i z i n c i c o l a

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The NAC nuclear microprobe facility

Cited by 101 publications

References 10 publications

Micro-PIXE analysis of varied sulfide populations from the Ventersdorp Contact Reef, Witwatersrand basin, South Africa

Micro-PIXE analysis of varied sulfide populations from the Ventersdorp Contact Reef, Witwatersrand basin, South Africa

Micro-PIXE mapping of mineral distribution in mature grain of two pearl millet cultivars

Elemental distribution by cryo-micro-PIXE in the zinc and cadmium hyperaccumulator Sedum plumbizincicola grown naturally

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