Angela Vasilescu | National Institute of Physics and Nuclear Engineering Bucharest (original) (raw)

Books by Angela Vasilescu

Research paper thumbnail of Particle Detector Briefbook

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Papers by Angela Vasilescu

Research paper thumbnail of Archaeometrical studies using X-ray fluorescence methods

AIP Conference Proceedings, 2010

Elemental analysis contributes to authentication (knowing the elemental composition and consideri... more Elemental analysis contributes to authentication (knowing the elemental composition and considering the information about the usual composition of the objects in different historical periods it can be established if the item is original or fake), provenance studies (minor and trace ...

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Research paper thumbnail of XRF-Based Compositional Microanalysis for Provenance Studies of Metallic Artifacts

Romanian Reports in Physics, 2011

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Research paper thumbnail of Radiation hard silicon detectors—developments by the RD48 (ROSE) collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

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Research paper thumbnail of Radiation hard silicon detectors—developments by the RD48 (ROSE) collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

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Research paper thumbnail of Developments for radiation hard silicon detectors by defect engineering—results by the CERN RD48 (ROSE) Collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

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Research paper thumbnail of Studies on archaeological gold items found in Romanian territory using X-Ray-based analytical spectrometry

Journal of Analytical Atomic Spectrometry, 2012

ABSTRACT The paper is an overview of the work developed by our group in the investigations on mus... more ABSTRACT The paper is an overview of the work developed by our group in the investigations on museum objects and alluvial gold, reflected in a series of studies published between 2000-2011, supplemented with new results, unpublished up-to-date. The X-ray based spectrometric techniques employed range from various X-Ray Fluorescence (XRF) investigations to Ion Beam Analysis, including Synchrotron radiation XRF and micro-Particle Induced X-ray Emission. The gold objects discussed are mainly part of the Sarmizegetusa Dacian hoards - spiraled bracelets (armbands) and coins. After obtaining in 2011 the permission of the Romanian authorities to take very small (1-2 mg) samples from the most "unimportant" areas of the Dacian bracelets and several Koson staters, to analyze them by micro-SR-XRF at BESSY, in February 2012, the investigation of several micro-areas of 17 stater and 28 bracelet samples revealed important micro-structural inhomogeneity, especially in Sn and Cu. The same inhomogeneous micro-structure has been seen in Transylvanian alluvial gold. The analyses revealed details on the fingerprint of geological gold deposits and also the main characteristics of ancient gold metallurgy procedures used by the Dacians: a relatively low temperature (lower than Au melting point) and hammering during heating to obtain an ingot through sintering. The use of the sintering procedure was proved for the spiraled bracelets and the Koson without monogram coins - a tradition starting in the Bronze Age in Transylvanian gold processing. The existence of micro-inclusions of Ta-minerals in alluvial gold was also detected, explaining Ta trace presence in the artifacts from the Pietroasa hoard.

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Research paper thumbnail of The Particle Detector BriefBook

Accelerator Physics, 1998

... Page 6. Springer Berlin Heidelberg New York Barcelona Budapest Hong Kong London Milan Paris S... more ... Page 6. Springer Berlin Heidelberg New York Barcelona Budapest Hong Kong London Milan Paris Santa Clara Singapore Tokyo Page 7. Rudolf K. Bock Angela Vasilescu The Particle Detector BriefBook With 8 Figures Springer This One H2A6-XNE-ULP7 Page 8. ...

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Research paper thumbnail of The Geochemical Signature of Native Gold from Roşia Montană and Musariu Ore Deposits Metaliferi Mts. (Romania); Preliminary Data

Abstract: The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te... more Abstract: The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, Pb, Platinum Group Elements- PGE) are very important to authenticate archaeological gold artifacts. In order to find the provenance of ancient gold artifacts found on the Romanian territory we attempted to understand if a chemical-elemental signature exists for Romanian gold. Several analytical methods were used to investigate gold ores and gold artifacts, such as the electron microprobe, scanning electron microscopy (SEM), micro synchrotron radiation induced X-ray fluorescence (micro-SR-XRF). Among the goals of the study was to demonstrate that micro particle induced X-ray emission (micro-PIXE) could be a useful tool in establishing the origin of gold ancient artifacts.

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Research paper thumbnail of Studies on Romanian prehistoric bronze artifacts at ATOMKI Debrecen

Technè

Compositional studies on ancient bronze artefacts and on the possible provenance of their copper ... more Compositional studies on ancient bronze artefacts and on the possible provenance of their copper and tin contents are performed all around the world. For South-Eastern Europe, Balkan Bronze Age artifacts have been studied in relation to the compositional pattern of ancient mines from Serbia and Bulgaria. We decided to start a similar investigation on Bronze Age bronze artifacts found on Romanian territory and to compare the results with already published data on old regional mines – Austria, ...

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Research paper thumbnail of Nuclear Physics Micro-SR-XRF Studies of Gold Provenance in Archaeology

Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of ... more Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of a typical signature (fingerprint) of gold coming from specific sources. The presence of trace elements (Sb, Sn, Te, Pb) in Transylvanian gold and the analysis of their concentrations in archaeological artifacts found on the territory of Romania can lead to conclusions related to the provenance of the gold used in their manufacture. This work attempted to establish the origin of the gold used for the mint of two different types of coins and for a Bronze Age hair ring from the Tauteu hoard. Except for the kosons with monogram, which were manufactured from refined gold, the other objects show an alluvial signature.

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Research paper thumbnail of The Geochemical Signature of Native Gold from Roşia Montană and Musariu Ore Deposits Metaliferi Mts. (Romania); Preliminary Data

The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, ... more The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, Pb, Platinum Group Elements - PGE) are very important to authenticate archaeological gold artifacts. In order to find the provenance of ancient gold artifacts found on the Romanian territory we attempted to understand if a chemical-elemental signature exists for Romanian gold. Several analytical methods were used to investigate gold ores and gold artifacts, such as the electron microprobe, scanning electron microscopy (SEM), micro synchrotron radiation induced X-ray fluorescence (micro-SR-XRF). Among the goals of the study was to demonstrate that micro particle induced X-ray emission (micro-PIXE) could be a useful tool in establishing the origin of gold ancient artifacts.

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Research paper thumbnail of CR-39 Sampling of Indoor Radon in Southern Romania

The new Solid State Nuclear Track Detector (SSNTD) Indoor Radon Laboratory of the Applied Nuclear... more The new Solid State Nuclear Track Detector (SSNTD) Indoor Radon Laboratory of the Applied Nuclear Physics Department at the Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN) employs CR-39 plastic detectors and a Radosys set-up [1]. It is mainly aimed at the regional coverage of the necessities of indoor radon measurements especially in the Southern part of Romania, but also to become a reliable member of a National Radon network. The implementation of this technique brought along a series of tests for the better understanding of this already well established method, and was doubled by indoor sampling measurements at various sites. The geographical region covered by our study was expected to be of reasonably low impact, compared to radon prone areas in the country (e.g. Crucea in Moldova, Stei in Transylvania), however, as to our present knowledge, the statistic of existing measurements for this region is low and any new data are welcome. Radon originates fro...

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Research paper thumbnail of Archaeometallurgical Characterization of Ancient Gold Artifacts from Romanian Museums Using XRF, Micro-Pixe and Micro-SR-XRF Methods

Trace elements are more significant for provenance of archaeological metallic artifacts than the ... more Trace elements are more significant for provenance of archaeological metallic artifacts than the main components. For gold, the most promising elements are Platinum Group Elements (PGE), Sn, Te, Sb, Hg, Pb. To authenticate twelve Dacian gold bracelets and twenty Dacian gold coins (staters) type Koson was necessary to identify in their composition Transylvanian gold fingerprints Sn, Sb and Te. After an XRF examination of the artifacts, several small fragments from them and some natural Transylvanian native gold samples were studied using micro-PIXE at Legnaro National Laboratory, Italy and using micro-SR-XRF at ANKA Synchrotron, Karlsruhe, Germany.

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Research paper thumbnail of XRF and micro-PIXE studies of inhomogeneity of ancient bronze and silver alloys

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Abstract New results regarding alloy composition and microstructure for a series of ancient bronz... more Abstract New results regarding alloy composition and microstructure for a series of ancient bronze and silver items by X-ray Fluorescence and micro-Particle Induced X-ray Emission spectrometry were obtained in the framework of an extensive numismatic project (Scythian-type arrowheads, arrowhead-shaped monetary signs and wheel coins produced by Histria, 7th–4th century of BCE, and Dacian Radulesti-Hunedoara-type silver tetradrachms, 2nd–1st century of BCE). In Histria, warfare arrowheads were used for trade with Barbarian neighbors at first, then mechanically modified, next melted and cast as dedicated monetary signs, being, in the end, replaced by wheel coins. Three different types of alloys have been identified, and Cu-Mn and Cu-Pb segregation shown. In a blank for Radulesti-Hunedoara-type coins, Ag-(Cu+Pb) segregation has been demonstrated, suggesting an imperfectly alloyed silver-leaded bronze.

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Research paper thumbnail of Micro-SR-XRF Studies of Gold Provenance in Archaeology

Romanian Journal of Physics, Jan 23, 2011

Abstract. Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establi... more Abstract. Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of a typical signature (fingerprint) of gold coming from specific sources. The presence of trace elements (Sb, Sn, Te, Pb) in Transylvanian gold and the analysis of their ...

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Research paper thumbnail of Status and Perspectives for a Slow Positron Beam Facility at the HH—NIPNE Bucharest

AIP Conference Proceedings, 2009

The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to b... more The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to be used for material studies and applications was started in the last 10 years. In the framework of a national research project extended over the last 3 years, was ...

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Research paper thumbnail of Micro-SR-XRF studies for archaeological gold identification---the case of Carpathian gold and Romanian museal objects

Applied Physics a Materials Science Processing, Mar 24, 2010

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Research paper thumbnail of Optimisation of silicon and diamond microstrip detectors for high flux density experiments

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Research paper thumbnail of Radiation damage of silicon detectors in intense particle fluences - between testing and application in crossing beam experiments in the TeV energy range

Romanian Reports in Physics

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Research paper thumbnail of Archaeometrical studies using X-ray fluorescence methods

AIP Conference Proceedings, 2010

Elemental analysis contributes to authentication (knowing the elemental composition and consideri... more Elemental analysis contributes to authentication (knowing the elemental composition and considering the information about the usual composition of the objects in different historical periods it can be established if the item is original or fake), provenance studies (minor and trace ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of XRF-Based Compositional Microanalysis for Provenance Studies of Metallic Artifacts

Romanian Reports in Physics, 2011

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Research paper thumbnail of Radiation hard silicon detectors—developments by the RD48 (ROSE) collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Radiation hard silicon detectors—developments by the RD48 (ROSE) collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

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Research paper thumbnail of Developments for radiation hard silicon detectors by defect engineering—results by the CERN RD48 (ROSE) Collaboration

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

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Research paper thumbnail of Studies on archaeological gold items found in Romanian territory using X-Ray-based analytical spectrometry

Journal of Analytical Atomic Spectrometry, 2012

ABSTRACT The paper is an overview of the work developed by our group in the investigations on mus... more ABSTRACT The paper is an overview of the work developed by our group in the investigations on museum objects and alluvial gold, reflected in a series of studies published between 2000-2011, supplemented with new results, unpublished up-to-date. The X-ray based spectrometric techniques employed range from various X-Ray Fluorescence (XRF) investigations to Ion Beam Analysis, including Synchrotron radiation XRF and micro-Particle Induced X-ray Emission. The gold objects discussed are mainly part of the Sarmizegetusa Dacian hoards - spiraled bracelets (armbands) and coins. After obtaining in 2011 the permission of the Romanian authorities to take very small (1-2 mg) samples from the most "unimportant" areas of the Dacian bracelets and several Koson staters, to analyze them by micro-SR-XRF at BESSY, in February 2012, the investigation of several micro-areas of 17 stater and 28 bracelet samples revealed important micro-structural inhomogeneity, especially in Sn and Cu. The same inhomogeneous micro-structure has been seen in Transylvanian alluvial gold. The analyses revealed details on the fingerprint of geological gold deposits and also the main characteristics of ancient gold metallurgy procedures used by the Dacians: a relatively low temperature (lower than Au melting point) and hammering during heating to obtain an ingot through sintering. The use of the sintering procedure was proved for the spiraled bracelets and the Koson without monogram coins - a tradition starting in the Bronze Age in Transylvanian gold processing. The existence of micro-inclusions of Ta-minerals in alluvial gold was also detected, explaining Ta trace presence in the artifacts from the Pietroasa hoard.

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Research paper thumbnail of The Particle Detector BriefBook

Accelerator Physics, 1998

... Page 6. Springer Berlin Heidelberg New York Barcelona Budapest Hong Kong London Milan Paris S... more ... Page 6. Springer Berlin Heidelberg New York Barcelona Budapest Hong Kong London Milan Paris Santa Clara Singapore Tokyo Page 7. Rudolf K. Bock Angela Vasilescu The Particle Detector BriefBook With 8 Figures Springer This One H2A6-XNE-ULP7 Page 8. ...

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Research paper thumbnail of The Geochemical Signature of Native Gold from Roşia Montană and Musariu Ore Deposits Metaliferi Mts. (Romania); Preliminary Data

Abstract: The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te... more Abstract: The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, Pb, Platinum Group Elements- PGE) are very important to authenticate archaeological gold artifacts. In order to find the provenance of ancient gold artifacts found on the Romanian territory we attempted to understand if a chemical-elemental signature exists for Romanian gold. Several analytical methods were used to investigate gold ores and gold artifacts, such as the electron microprobe, scanning electron microscopy (SEM), micro synchrotron radiation induced X-ray fluorescence (micro-SR-XRF). Among the goals of the study was to demonstrate that micro particle induced X-ray emission (micro-PIXE) could be a useful tool in establishing the origin of gold ancient artifacts.

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Research paper thumbnail of Studies on Romanian prehistoric bronze artifacts at ATOMKI Debrecen

Technè

Compositional studies on ancient bronze artefacts and on the possible provenance of their copper ... more Compositional studies on ancient bronze artefacts and on the possible provenance of their copper and tin contents are performed all around the world. For South-Eastern Europe, Balkan Bronze Age artifacts have been studied in relation to the compositional pattern of ancient mines from Serbia and Bulgaria. We decided to start a similar investigation on Bronze Age bronze artifacts found on Romanian territory and to compare the results with already published data on old regional mines – Austria, ...

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Research paper thumbnail of Nuclear Physics Micro-SR-XRF Studies of Gold Provenance in Archaeology

Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of ... more Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of a typical signature (fingerprint) of gold coming from specific sources. The presence of trace elements (Sb, Sn, Te, Pb) in Transylvanian gold and the analysis of their concentrations in archaeological artifacts found on the territory of Romania can lead to conclusions related to the provenance of the gold used in their manufacture. This work attempted to establish the origin of the gold used for the mint of two different types of coins and for a Bronze Age hair ring from the Tauteu hoard. Except for the kosons with monogram, which were manufactured from refined gold, the other objects show an alluvial signature.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Geochemical Signature of Native Gold from Roşia Montană and Musariu Ore Deposits Metaliferi Mts. (Romania); Preliminary Data

The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, ... more The main components of gold alloys (Au-Ag-Cu) as well as related trace elements (Sn, Te, Sb, Hg, Pb, Platinum Group Elements - PGE) are very important to authenticate archaeological gold artifacts. In order to find the provenance of ancient gold artifacts found on the Romanian territory we attempted to understand if a chemical-elemental signature exists for Romanian gold. Several analytical methods were used to investigate gold ores and gold artifacts, such as the electron microprobe, scanning electron microscopy (SEM), micro synchrotron radiation induced X-ray fluorescence (micro-SR-XRF). Among the goals of the study was to demonstrate that micro particle induced X-ray emission (micro-PIXE) could be a useful tool in establishing the origin of gold ancient artifacts.

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Research paper thumbnail of CR-39 Sampling of Indoor Radon in Southern Romania

The new Solid State Nuclear Track Detector (SSNTD) Indoor Radon Laboratory of the Applied Nuclear... more The new Solid State Nuclear Track Detector (SSNTD) Indoor Radon Laboratory of the Applied Nuclear Physics Department at the Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN) employs CR-39 plastic detectors and a Radosys set-up [1]. It is mainly aimed at the regional coverage of the necessities of indoor radon measurements especially in the Southern part of Romania, but also to become a reliable member of a National Radon network. The implementation of this technique brought along a series of tests for the better understanding of this already well established method, and was doubled by indoor sampling measurements at various sites. The geographical region covered by our study was expected to be of reasonably low impact, compared to radon prone areas in the country (e.g. Crucea in Moldova, Stei in Transylvania), however, as to our present knowledge, the statistic of existing measurements for this region is low and any new data are welcome. Radon originates fro...

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Research paper thumbnail of Archaeometallurgical Characterization of Ancient Gold Artifacts from Romanian Museums Using XRF, Micro-Pixe and Micro-SR-XRF Methods

Trace elements are more significant for provenance of archaeological metallic artifacts than the ... more Trace elements are more significant for provenance of archaeological metallic artifacts than the main components. For gold, the most promising elements are Platinum Group Elements (PGE), Sn, Te, Sb, Hg, Pb. To authenticate twelve Dacian gold bracelets and twenty Dacian gold coins (staters) type Koson was necessary to identify in their composition Transylvanian gold fingerprints Sn, Sb and Te. After an XRF examination of the artifacts, several small fragments from them and some natural Transylvanian native gold samples were studied using micro-PIXE at Legnaro National Laboratory, Italy and using micro-SR-XRF at ANKA Synchrotron, Karlsruhe, Germany.

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Research paper thumbnail of XRF and micro-PIXE studies of inhomogeneity of ancient bronze and silver alloys

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Abstract New results regarding alloy composition and microstructure for a series of ancient bronz... more Abstract New results regarding alloy composition and microstructure for a series of ancient bronze and silver items by X-ray Fluorescence and micro-Particle Induced X-ray Emission spectrometry were obtained in the framework of an extensive numismatic project (Scythian-type arrowheads, arrowhead-shaped monetary signs and wheel coins produced by Histria, 7th–4th century of BCE, and Dacian Radulesti-Hunedoara-type silver tetradrachms, 2nd–1st century of BCE). In Histria, warfare arrowheads were used for trade with Barbarian neighbors at first, then mechanically modified, next melted and cast as dedicated monetary signs, being, in the end, replaced by wheel coins. Three different types of alloys have been identified, and Cu-Mn and Cu-Pb segregation shown. In a blank for Radulesti-Hunedoara-type coins, Ag-(Cu+Pb) segregation has been demonstrated, suggesting an imperfectly alloyed silver-leaded bronze.

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Research paper thumbnail of Micro-SR-XRF Studies of Gold Provenance in Archaeology

Romanian Journal of Physics, Jan 23, 2011

Abstract. Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establi... more Abstract. Micro-Synchrotron Radiation X-Ray Fluorescence (SR-XRF) studies can help in the establishment of a typical signature (fingerprint) of gold coming from specific sources. The presence of trace elements (Sb, Sn, Te, Pb) in Transylvanian gold and the analysis of their ...

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Research paper thumbnail of Status and Perspectives for a Slow Positron Beam Facility at the HH—NIPNE Bucharest

AIP Conference Proceedings, 2009

The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to b... more The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to be used for material studies and applications was started in the last 10 years. In the framework of a national research project extended over the last 3 years, was ...

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Research paper thumbnail of Micro-SR-XRF studies for archaeological gold identification---the case of Carpathian gold and Romanian museal objects

Applied Physics a Materials Science Processing, Mar 24, 2010

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Research paper thumbnail of Optimisation of silicon and diamond microstrip detectors for high flux density experiments

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Radiation damage of silicon detectors in intense particle fluences - between testing and application in crossing beam experiments in the TeV energy range

Romanian Reports in Physics

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Research paper thumbnail of Radon assessment with SSNTD in Bucharest area and surroundings

Romanian Reports in Physics

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Research paper thumbnail of Status and Perspectives for a Slow Positron Beam Facility at the HH—NIPNE Bucharest

AIP Conference Proceedings, Jan 1, 2009

The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to b... more The development of a positron annihilation spectroscopy laboratory at the HH‐NIPNE Bucharest‐to be used for material studies and applications was started in the last 10 years. In the framework of a national research project extended over the last 3 years, was ...

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Research paper thumbnail of Status of an R&D project of a positron gun at Horia Hulubei NIPNE Bucharest

Applied Surface Science, Jan 1, 2008

A new positron gun (PG) will enable high sensitivity measurements in applications of positron ann... more A new positron gun (PG) will enable high sensitivity measurements in applications of positron annihilation spectroscopy in Romania. Some data concerning the design of a modular system for focussing, transport and acceleration of mono-energetic positrons in the range 0.8–50 ...

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