L Wacker
Datos Biográficos
| ID | 4130147 |
|---|---|
| NOMBRE | L Wacker |
| NOMBRES | L |
| APELLIDO | Wacker |
| FIRMA | WACKER L |
| AFILIACIONES | ETH Zurich |
| VERIFICADO | No |
| TOTAL DE OBRAS | 20 |
| TOTAL DE CITAS | 288 |
| TOTAL COMO AUTOR | 20 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2004 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2020 |
| ÍNDICE H | 7 |
Unravelling Quasi-Continuous 14 C Profiles by Laser Ablation AMS
Laser ablation (LA) accelerator mass spectrometry (AMS) is a novel method for rapid online radiocarbon ( 14 C) analysis of carbonates. The quasi-continuous 14 C profiles obtained with this technique demand a customized data evaluation protocol to relate the acquired 14 C data to the analyzed sample. We take into account the mixing effects due to the minimal counting (integration) time of the AMS, the finite width of the laser beam and the gas was…
Comprehensive radiocarbon analysis of benzene polycarboxylic acids (BPCAs) derived from pyrogenic carbon in environmental samples
Compound-specific radiocarbon analysis (CSRA) of benzene polycarboxylic acids (BPCAs) yields molecular-level, source-specific information necessary to constrain isotopic signatures of pyrogenic carbon. However, the purification of individual BPCAs requires a multistep procedure that typically results in only microgram quantities of the target analyte(s). Such small samples are highly susceptible to contamination by extraneous carbon, which needs …
Novel Laser Ablation Sampling Device for the Rapid Radiocarbon Analysis of Carbonate Samples by Accelerator Mass Spectrometry
Conventional radiocarbon analysis of carbonate records with accelerator mass spectrometry (AMS) is time consuming and the achievable spatial resolution is limited, because individual samples have to be taken and need to be converted to graphite for the measurement. A new laser ablation (LA) in situ sampling technique for rapid online 14 C analyses of carbonate records by AMS is presented. By focusing a 193-nm ArF excimer laser on carbonate sample…
Radiocarbon Dating to a Single Year by Means of Rapid Atmospheric 14C Changes
In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14 C calibration data, particularly in timespans when there are rapid changes in atmospheric 14 C concentration. The recently observed jump in atmospheric 14 C concentration of 1.5% …
Radiocarbon Dating to a Single Year by Means of Rapid Atmospheric 14 C Changes
In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14 C calibration data, particularly in timespans when there are rapid changes in atmospheric 14 C concentration. The recently observed jump in atmospheric 14 C concentration of 1.5% …
C Measurements of Ice Samples from the Juvfonne Ice Tunnel, Jotunheimen, Southern Norway—Validation of a 14 C Dating Technique for Glacier Ice
Establishing precise age-depth relationships of high-alpine ice cores is essential in order to deduce conclusive paleoclimatic information from these archives. Radiocarbon dating of carbonaceous aerosol particles incorporated in such glaciers is a promising tool to gain absolute ages, especially from the deepest parts where conventional methods are commonly inapplicable. In this study, we present a new validation for a published 14 C dating metho…
Radiocarbon Impact on a Nearby Tree of a Light-Water VVER-Type Nuclear Power Plant, Paks, Hungary
Tree-ring series were collected for radiocarbon analyses from the vicinity of Paks nuclear power plant (NPP) and a background area (Dunaföldvár) for a 10-yr period (2000–2009). Samples of holocellulose were prepared from the wood and converted to graphite for accelerator mass spectrometry (AMS) 14 C measurement using the MICADAS at ETH Zürich. The 14 C concentration data from these tree rings was compared to the background tree rings for each yea…
Fossil and Non-Fossil Sources of Different Carbonaceous Fractions in Fine and Coarse Particles by Radiocarbon Measurement
Radiocarbon offers a unique possibility for unambiguous source apportionment of carbonaceous particles due to a direct distinction of non-fossil and fossil carbon. In this work, particulate matter of different size fractions was collected at 4 sites in Switzerland to examine whether fine and coarse carbonaceous particles exhibit different fossil and contemporary sources. Elemental carbon (EC) and organic carbon (OC) as well as water-soluble OC (W…
Extraction of Dissolved Inorganic Carbon (DIC) from Seawater Samples at Cedad
A dedicated sample processing line for the extraction of dissolved inorganic carbon (DIC) from seawater and groundwater for accelerator mass spectrometry (AMS) radiocarbon analysis has been developed at CEDAD, the Center for Dating and Diagnostic of the University of Salento, Lecce, Italy. The features of the new system are presented together with tests carried out to determine its functionality and background levels. The first results obtained a…
Intercomparison of 14 C Dating of Wood Samples at Lund University and ETH-Zurich AMS Facilities
We conducted an interlaboratory comparison between our radiocarbon-related research group at Lund University and the established ETH-Zurich facility to test the quality of the results obtained in Lund and to identify sources of potential background differences and scatter. We did find differences between the 2 laboratories in the contributions of chemical preparation, graphitization, and measurements to the overall background. The resulting overa…
Status Report of the New AMS 14 C Sample Preparation Lab of the Hertelendi Laboratory of Environmental Studies (Debrecen, Hungary)
We document chemical laboratory procedures and results on international comparison samples at the Hertelendi Laboratory of Environmental Studies, Debrecen, Hungary. We also show results using the new MICADAS system and compare these results to internationally recognized standards and blank materials. The newly developed sample preparation system in HEKAL can handle samples as 1) organic material, 2) cellulose fraction of plant, 3) bones, 4) carbo…
EnvironMicadas
A more developed and modern technology replaced the old radiocarbon measuring methods in Hungary, based on isotope separation by accelerator mass spectrometry (AMS) and not on activity measurements. In summer 2011, the EnvironMICADAS was successfully installed in the Laboratory of HEKAL, Debrecen, Hungary. In this project, a multipurpose gas-handling system was developed for the gas ion source of EnvironMICADAS at ETH Zürich, designed for the mea…
Intercomparison of 14 C Analysis of Carbonaceous Aerosols
Radiocarbon analysis of the carbonaceous aerosol allows an apportionment of fossil and non-fossil sources of airborne particulate matter (PM). A chemical separation of total carbon (TC) into its subtractions organic carbon (OC) and elemental carbon (EC) refines this powerful technique, as OC and EC originate from different sources and undergo different processes in the atmosphere. Although 14 C analysis of TC, EC, and OC has recently gained incre…
On-line Radiocarbon Measurements of Small Samples Using Elemental Analyzer and Micadas Gas Ion Source
An on-line measurement system was installed at the MICADAS in Zurich, using an elemental analyzer (EA) as a combustion unit to enable direct radiocarbon measurement of samples containing carbon in the range of 5–100 μg possible with minimum effort. The samples are combusted in small capsules and the gaseous combustion products are separated by the EA. The carbon dioxide leaving the EA in a high helium flow is concentrated on a small external trap…
A Preparative 2D-Chromatography Method for Compound-Specific Radiocarbon Analysis of Dicarboxylic Acids in Aerosols
There is a great scientific demand for an assessment of the sources and formation processes of atmospheric carbonaceous aerosols since they strongly influence the global radiation balance and affect public health. Much attention in atmospheric studies has been paid to dicarboxylic acids (DCAs) due to their abundance at substantially different sites and their potential influence on cloud formation processes. Nevertheless, sources of oxalic acid (H…
Are Compact AMS Facilities a Competitive Alternative to Larger Tandem Accelerators
In the last decade, small and compact accelerator mass spectrometry (AMS) systems became available operating at terminal voltages of 1 MV and below. This new category of instruments has become competitive for radiocarbon detection to larger tandem accelerators and many of these instruments are successfully used for 14 C dating or biomedical applications. The AMS group at ETH Zurich has demonstrated that small instruments can be built, which allow…
Micadas
The prototype mini carbon dating system (MICADAS) at ETH Zurich has been in routine operation for almost 2 yr. Because of its simple and compact layout, setting up a radiocarbon measurement is fast and the system runs very reliably over days or even weeks without retuning. The stability of the instrument is responsible for the good performance in highest-precision measurements where results of single samples can be reproduced within less than 2‰.…
A Gas Ion Source for Radiocarbon Measurements at 200 kV
The novel tabletop miniaturized radiocarbon dating system (MICADAS) at ETH Zurich features a hybrid Cs sputter negative ion source for the measurement of solid graphite and gaseous CO 2 samples. The source produces stable currents of up to 6 μA C − out of gaseous samples with an efficiency of 3–6%. A gas feeding system has been set up that enables constant dosing of CO 2 into the Cs sputter ion source and ensures stable measuring conditions. The …
Be Analyses with a Compact AMS Facility—Are Bef 2 Samples the Solution
The injection of 10 BeF - instead of 10 BeO - into a compact accelerator mass spectrometry system with a terminal voltage of 0.58 MV was investigated, because BF - molecules are unstable and isobaric interference of 10 B with 10 Be can thus be significantly reduced. We describe the method we developed to prepare BeF 2 samples. 10 Be was measured in a segmented gas ionization detector. Separation of 10 Be from 10 B could be achieved both for ions …
Source Apportionment of Aerosols by 14 C Measurements in Different Carbonaceous Particle Fractions
Radiocarbon enables a distinction between contemporary and fossil carbon, which can be used for the apportionment of biogenic and anthropogenic sources in environmental studies. In order to apply this approach to carbonaceous atmospheric aerosols, it is necessary to adapt pretreatment procedures to the requirements of 14 C measurements. In this work, we followed an approach in which total carbon (TC) is subdivided into fractions of different chem…
Micadas
The prototype mini carbon dating system (MICADAS) at ETH Zurich has been in routine operation for almost 2 yr. Because of its simple and compact layout, setting up a radiocarbon measurement is fast and the system runs very reliably over days or even weeks without retuning. The stability of the instrument is responsible for the good performance in highest-precision measurements where results of single samples can be reproduced within less than 2‰.…
Status Report of the New AMS 14 C Sample Preparation Lab of the Hertelendi Laboratory of Environmental Studies (Debrecen, Hungary)
We document chemical laboratory procedures and results on international comparison samples at the Hertelendi Laboratory of Environmental Studies, Debrecen, Hungary. We also show results using the new MICADAS system and compare these results to internationally recognized standards and blank materials. The newly developed sample preparation system in HEKAL can handle samples as 1) organic material, 2) cellulose fraction of plant, 3) bones, 4) carbo…
A Gas Ion Source for Radiocarbon Measurements at 200 kV
The novel tabletop miniaturized radiocarbon dating system (MICADAS) at ETH Zurich features a hybrid Cs sputter negative ion source for the measurement of solid graphite and gaseous CO 2 samples. The source produces stable currents of up to 6 μA C − out of gaseous samples with an efficiency of 3–6%. A gas feeding system has been set up that enables constant dosing of CO 2 into the Cs sputter ion source and ensures stable measuring conditions. The …
EnvironMicadas
A more developed and modern technology replaced the old radiocarbon measuring methods in Hungary, based on isotope separation by accelerator mass spectrometry (AMS) and not on activity measurements. In summer 2011, the EnvironMICADAS was successfully installed in the Laboratory of HEKAL, Debrecen, Hungary. In this project, a multipurpose gas-handling system was developed for the gas ion source of EnvironMICADAS at ETH Zürich, designed for the mea…
On-line Radiocarbon Measurements of Small Samples Using Elemental Analyzer and Micadas Gas Ion Source
An on-line measurement system was installed at the MICADAS in Zurich, using an elemental analyzer (EA) as a combustion unit to enable direct radiocarbon measurement of samples containing carbon in the range of 5–100 μg possible with minimum effort. The samples are combusted in small capsules and the gaseous combustion products are separated by the EA. The carbon dioxide leaving the EA in a high helium flow is concentrated on a small external trap…
Radiocarbon Dating to a Single Year by Means of Rapid Atmospheric 14 C Changes
In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14 C calibration data, particularly in timespans when there are rapid changes in atmospheric 14 C concentration. The recently observed jump in atmospheric 14 C concentration of 1.5% …
Radiocarbon Impact on a Nearby Tree of a Light-Water VVER-Type Nuclear Power Plant, Paks, Hungary
Tree-ring series were collected for radiocarbon analyses from the vicinity of Paks nuclear power plant (NPP) and a background area (Dunaföldvár) for a 10-yr period (2000–2009). Samples of holocellulose were prepared from the wood and converted to graphite for accelerator mass spectrometry (AMS) 14 C measurement using the MICADAS at ETH Zürich. The 14 C concentration data from these tree rings was compared to the background tree rings for each yea…
Source Apportionment of Aerosols by 14 C Measurements in Different Carbonaceous Particle Fractions
Radiocarbon enables a distinction between contemporary and fossil carbon, which can be used for the apportionment of biogenic and anthropogenic sources in environmental studies. In order to apply this approach to carbonaceous atmospheric aerosols, it is necessary to adapt pretreatment procedures to the requirements of 14 C measurements. In this work, we followed an approach in which total carbon (TC) is subdivided into fractions of different chem…
Intercomparison of 14 C Analysis of Carbonaceous Aerosols
Radiocarbon analysis of the carbonaceous aerosol allows an apportionment of fossil and non-fossil sources of airborne particulate matter (PM). A chemical separation of total carbon (TC) into its subtractions organic carbon (OC) and elemental carbon (EC) refines this powerful technique, as OC and EC originate from different sources and undergo different processes in the atmosphere. Although 14 C analysis of TC, EC, and OC has recently gained incre…
Novel Laser Ablation Sampling Device for the Rapid Radiocarbon Analysis of Carbonate Samples by Accelerator Mass Spectrometry
Conventional radiocarbon analysis of carbonate records with accelerator mass spectrometry (AMS) is time consuming and the achievable spatial resolution is limited, because individual samples have to be taken and need to be converted to graphite for the measurement. A new laser ablation (LA) in situ sampling technique for rapid online 14 C analyses of carbonate records by AMS is presented. By focusing a 193-nm ArF excimer laser on carbonate sample…
Intercomparison of 14 C Dating of Wood Samples at Lund University and ETH-Zurich AMS Facilities
We conducted an interlaboratory comparison between our radiocarbon-related research group at Lund University and the established ETH-Zurich facility to test the quality of the results obtained in Lund and to identify sources of potential background differences and scatter. We did find differences between the 2 laboratories in the contributions of chemical preparation, graphitization, and measurements to the overall background. The resulting overa…
Fossil and Non-Fossil Sources of Different Carbonaceous Fractions in Fine and Coarse Particles by Radiocarbon Measurement
Radiocarbon offers a unique possibility for unambiguous source apportionment of carbonaceous particles due to a direct distinction of non-fossil and fossil carbon. In this work, particulate matter of different size fractions was collected at 4 sites in Switzerland to examine whether fine and coarse carbonaceous particles exhibit different fossil and contemporary sources. Elemental carbon (EC) and organic carbon (OC) as well as water-soluble OC (W…
Extraction of Dissolved Inorganic Carbon (DIC) from Seawater Samples at Cedad
A dedicated sample processing line for the extraction of dissolved inorganic carbon (DIC) from seawater and groundwater for accelerator mass spectrometry (AMS) radiocarbon analysis has been developed at CEDAD, the Center for Dating and Diagnostic of the University of Salento, Lecce, Italy. The features of the new system are presented together with tests carried out to determine its functionality and background levels. The first results obtained a…
Are Compact AMS Facilities a Competitive Alternative to Larger Tandem Accelerators
In the last decade, small and compact accelerator mass spectrometry (AMS) systems became available operating at terminal voltages of 1 MV and below. This new category of instruments has become competitive for radiocarbon detection to larger tandem accelerators and many of these instruments are successfully used for 14 C dating or biomedical applications. The AMS group at ETH Zurich has demonstrated that small instruments can be built, which allow…
Unravelling Quasi-Continuous 14 C Profiles by Laser Ablation AMS
Laser ablation (LA) accelerator mass spectrometry (AMS) is a novel method for rapid online radiocarbon ( 14 C) analysis of carbonates. The quasi-continuous 14 C profiles obtained with this technique demand a customized data evaluation protocol to relate the acquired 14 C data to the analyzed sample. We take into account the mixing effects due to the minimal counting (integration) time of the AMS, the finite width of the laser beam and the gas was…
Be Analyses with a Compact AMS Facility—Are Bef 2 Samples the Solution
The injection of 10 BeF - instead of 10 BeO - into a compact accelerator mass spectrometry system with a terminal voltage of 0.58 MV was investigated, because BF - molecules are unstable and isobaric interference of 10 B with 10 Be can thus be significantly reduced. We describe the method we developed to prepare BeF 2 samples. 10 Be was measured in a segmented gas ionization detector. Separation of 10 Be from 10 B could be achieved both for ions …
Source Apportionment of Aerosols by 14 C Measurements in Different Carbonaceous Particle Fractions
Radiocarbon enables a distinction between contemporary and fossil carbon, which can be used for the apportionment of biogenic and anthropogenic sources in environmental studies. In order to apply this approach to carbonaceous atmospheric aerosols, it is necessary to adapt pretreatment procedures to the requirements of 14 C measurements. In this work, we followed an approach in which total carbon (TC) is subdivided into fractions of different chem…
A Gas Ion Source for Radiocarbon Measurements at 200 kV
The novel tabletop miniaturized radiocarbon dating system (MICADAS) at ETH Zurich features a hybrid Cs sputter negative ion source for the measurement of solid graphite and gaseous CO 2 samples. The source produces stable currents of up to 6 μA C − out of gaseous samples with an efficiency of 3–6%. A gas feeding system has been set up that enables constant dosing of CO 2 into the Cs sputter ion source and ensures stable measuring conditions. The …
On-line Radiocarbon Measurements of Small Samples Using Elemental Analyzer and Micadas Gas Ion Source
An on-line measurement system was installed at the MICADAS in Zurich, using an elemental analyzer (EA) as a combustion unit to enable direct radiocarbon measurement of samples containing carbon in the range of 5–100 μg possible with minimum effort. The samples are combusted in small capsules and the gaseous combustion products are separated by the EA. The carbon dioxide leaving the EA in a high helium flow is concentrated on a small external trap…
A Preparative 2D-Chromatography Method for Compound-Specific Radiocarbon Analysis of Dicarboxylic Acids in Aerosols
There is a great scientific demand for an assessment of the sources and formation processes of atmospheric carbonaceous aerosols since they strongly influence the global radiation balance and affect public health. Much attention in atmospheric studies has been paid to dicarboxylic acids (DCAs) due to their abundance at substantially different sites and their potential influence on cloud formation processes. Nevertheless, sources of oxalic acid (H…
Are Compact AMS Facilities a Competitive Alternative to Larger Tandem Accelerators
In the last decade, small and compact accelerator mass spectrometry (AMS) systems became available operating at terminal voltages of 1 MV and below. This new category of instruments has become competitive for radiocarbon detection to larger tandem accelerators and many of these instruments are successfully used for 14 C dating or biomedical applications. The AMS group at ETH Zurich has demonstrated that small instruments can be built, which allow…
Micadas
The prototype mini carbon dating system (MICADAS) at ETH Zurich has been in routine operation for almost 2 yr. Because of its simple and compact layout, setting up a radiocarbon measurement is fast and the system runs very reliably over days or even weeks without retuning. The stability of the instrument is responsible for the good performance in highest-precision measurements where results of single samples can be reproduced within less than 2‰.…
C Measurements of Ice Samples from the Juvfonne Ice Tunnel, Jotunheimen, Southern Norway—Validation of a 14 C Dating Technique for Glacier Ice
Establishing precise age-depth relationships of high-alpine ice cores is essential in order to deduce conclusive paleoclimatic information from these archives. Radiocarbon dating of carbonaceous aerosol particles incorporated in such glaciers is a promising tool to gain absolute ages, especially from the deepest parts where conventional methods are commonly inapplicable. In this study, we present a new validation for a published 14 C dating metho…
Radiocarbon Impact on a Nearby Tree of a Light-Water VVER-Type Nuclear Power Plant, Paks, Hungary
Tree-ring series were collected for radiocarbon analyses from the vicinity of Paks nuclear power plant (NPP) and a background area (Dunaföldvár) for a 10-yr period (2000–2009). Samples of holocellulose were prepared from the wood and converted to graphite for accelerator mass spectrometry (AMS) 14 C measurement using the MICADAS at ETH Zürich. The 14 C concentration data from these tree rings was compared to the background tree rings for each yea…
Fossil and Non-Fossil Sources of Different Carbonaceous Fractions in Fine and Coarse Particles by Radiocarbon Measurement
Radiocarbon offers a unique possibility for unambiguous source apportionment of carbonaceous particles due to a direct distinction of non-fossil and fossil carbon. In this work, particulate matter of different size fractions was collected at 4 sites in Switzerland to examine whether fine and coarse carbonaceous particles exhibit different fossil and contemporary sources. Elemental carbon (EC) and organic carbon (OC) as well as water-soluble OC (W…
Extraction of Dissolved Inorganic Carbon (DIC) from Seawater Samples at Cedad
A dedicated sample processing line for the extraction of dissolved inorganic carbon (DIC) from seawater and groundwater for accelerator mass spectrometry (AMS) radiocarbon analysis has been developed at CEDAD, the Center for Dating and Diagnostic of the University of Salento, Lecce, Italy. The features of the new system are presented together with tests carried out to determine its functionality and background levels. The first results obtained a…
Intercomparison of 14 C Dating of Wood Samples at Lund University and ETH-Zurich AMS Facilities
We conducted an interlaboratory comparison between our radiocarbon-related research group at Lund University and the established ETH-Zurich facility to test the quality of the results obtained in Lund and to identify sources of potential background differences and scatter. We did find differences between the 2 laboratories in the contributions of chemical preparation, graphitization, and measurements to the overall background. The resulting overa…
Status Report of the New AMS 14 C Sample Preparation Lab of the Hertelendi Laboratory of Environmental Studies (Debrecen, Hungary)
We document chemical laboratory procedures and results on international comparison samples at the Hertelendi Laboratory of Environmental Studies, Debrecen, Hungary. We also show results using the new MICADAS system and compare these results to internationally recognized standards and blank materials. The newly developed sample preparation system in HEKAL can handle samples as 1) organic material, 2) cellulose fraction of plant, 3) bones, 4) carbo…
EnvironMicadas
A more developed and modern technology replaced the old radiocarbon measuring methods in Hungary, based on isotope separation by accelerator mass spectrometry (AMS) and not on activity measurements. In summer 2011, the EnvironMICADAS was successfully installed in the Laboratory of HEKAL, Debrecen, Hungary. In this project, a multipurpose gas-handling system was developed for the gas ion source of EnvironMICADAS at ETH Zürich, designed for the mea…
Intercomparison of 14 C Analysis of Carbonaceous Aerosols
Radiocarbon analysis of the carbonaceous aerosol allows an apportionment of fossil and non-fossil sources of airborne particulate matter (PM). A chemical separation of total carbon (TC) into its subtractions organic carbon (OC) and elemental carbon (EC) refines this powerful technique, as OC and EC originate from different sources and undergo different processes in the atmosphere. Although 14 C analysis of TC, EC, and OC has recently gained incre…
Radiocarbon Dating to a Single Year by Means of Rapid Atmospheric 14C Changes
In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14 C calibration data, particularly in timespans when there are rapid changes in atmospheric 14 C concentration. The recently observed jump in atmospheric 14 C concentration of 1.5% …
Radiocarbon Dating to a Single Year by Means of Rapid Atmospheric 14 C Changes
In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14 C calibration data, particularly in timespans when there are rapid changes in atmospheric 14 C concentration. The recently observed jump in atmospheric 14 C concentration of 1.5% …
Novel Laser Ablation Sampling Device for the Rapid Radiocarbon Analysis of Carbonate Samples by Accelerator Mass Spectrometry
Conventional radiocarbon analysis of carbonate records with accelerator mass spectrometry (AMS) is time consuming and the achievable spatial resolution is limited, because individual samples have to be taken and need to be converted to graphite for the measurement. A new laser ablation (LA) in situ sampling technique for rapid online 14 C analyses of carbonate records by AMS is presented. By focusing a 193-nm ArF excimer laser on carbonate sample…
Comprehensive radiocarbon analysis of benzene polycarboxylic acids (BPCAs) derived from pyrogenic carbon in environmental samples
Compound-specific radiocarbon analysis (CSRA) of benzene polycarboxylic acids (BPCAs) yields molecular-level, source-specific information necessary to constrain isotopic signatures of pyrogenic carbon. However, the purification of individual BPCAs requires a multistep procedure that typically results in only microgram quantities of the target analyte(s). Such small samples are highly susceptible to contamination by extraneous carbon, which needs …
Unravelling Quasi-Continuous 14 C Profiles by Laser Ablation AMS
Laser ablation (LA) accelerator mass spectrometry (AMS) is a novel method for rapid online radiocarbon ( 14 C) analysis of carbonates. The quasi-continuous 14 C profiles obtained with this technique demand a customized data evaluation protocol to relate the acquired 14 C data to the analyzed sample. We take into account the mixing effects due to the minimal counting (integration) time of the AMS, the finite width of the laser beam and the gas was…
Radiocarbon dating (17 obras) · Chemistry (15 obras) · Geology (14 obras) · Archaeology and ancient environmental studies (11 obras) · Accelerator mass spectrometry (10 obras) · Carbon fibers (10 obras) · Environmental Chemistry (10 obras) · Materials Science (10 obras) · Physics (10 obras) · Environmental Science (9 obras)