The ETH Zurich AMS facilities: Performance parameters and reference materials

Christl, Marcus; Vockenhuber, Christof; Kubik, Peter W.; Wacker, Lukas; Lachner, Johannes; Alfimov, Vasily; Synal, Hans-Arno

doi:10.1016/j.nimb.2012.03.004

Cited by 279 publications

(325 citation statements)

References 62 publications

Supporting

Mentioning

280

Contrasting

Unclassified

Order By: Relevance

“…10 Be / 9 Be ratios were measured at different AMS (accelerator mass spectrometry) facilities: the 5 MeV ASTER AMS facility at CEREGE (Klein et al, 2008), the 6 MeV TANDEM AMS, and the 0.5 TANDY AMS of ETH Zürich (Christl et al, 2013). 10 Be / 9 Be ratios measured at the CEREGE were normalized to NIST 27900, with an assumed 10 Be / 9 Be ratio of 2.79 × 10 −11 , while the 10 Be / 9 Be ra-tios measured at ETH were normalized to the ETH standard S2007N, with an assumed ratio 2.81 × 10 −11 (Christl et al, 2013).…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

Lupker¹,

Lavé²,

France‐Lanord

et al. 2017

Earth Surf. Dynam.

View full text Add to dashboard Cite

Abstract. The Tsangpo-Brahmaputra River drains the eastern part of the Himalayan range and flows from the Tibetan Plateau through the eastern Himalayan syntaxis downstream to the Indo-Gangetic floodplain and the Bay of Bengal. As such, it is a unique natural laboratory to study how denudation and sediment production processes are transferred to river detrital signals. In this study, we present a new 10 Be data set to constrain denudation rates across the catchment and to quantify the impact of rapid erosion within the syntaxis region on cosmogenic nuclide budgets and signals. The measured 10 Be denudation rates span around 2 orders of magnitude across individual catchments (ranging from 0.03 to > 4 mm yr −1 ) and sharply increase as the Tsangpo-Brahmaputra flows across the eastern Himalaya. The increase in denudation rates, however, occurs ∼ 150 km downstream of the Namche Barwa-Gyala Peri massif (NBGPm), an area which has been previously characterized by extremely high erosion and exhumation rates. We suggest that this downstream lag is mainly due to the physical abrasion of coarse-grained, low 10 Be concentration, landslide material produced within the syntaxis that dilutes the upstream high-concentration 10 Be flux from the Tibetan Plateau only after abrasion has transferred sediment to the studied sand fraction. A simple abrasion model produces typical lag distances of 50 to 150 km compatible with our observations. Abrasion effects reduce the spatial resolution over which denudation can be constrained in the eastern Himalayan syntaxis. In addition, we also highlight that denudation rate estimates are dependent on the sediment connectivity, storage, and quartz content of the upstream Tibetan Plateau part of the catchment, which tends to lead to an overestimation of downstream denudation rates. While no direct 10 Be denudation measurements were made in the syntaxis, the dilution of the upstream 10 Be signal, measured in Tsangpo-Brahmaputra sediments, provides constraints on the denudation rates in that region. These denudation estimates range from ca. 2 to 5 mm yr −1 for the entire syntaxis and ca. 4 to 28 mm yr −1 for the NBGPm, which is significantly higher than other large catchments. Overall, 10 Be concentrations measured at the outlet of the Tsangpo-Brahmaputra in Bangladesh suggest a sediment flux between 780 and 1430 Mt yr −1 equivalent to a denudation rate between 0.7 and 1.2 mm yr −1 for the entire catchment.

show abstract

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

Lupker¹,

Lavé²,

France‐Lanord

et al. 2017

Earth Surf. Dynam.

View full text Add to dashboard Cite

show abstract

“…MIni CArbon DAting System (MICADAS) fitted with a gas-ion source (Ionplus AG) at the 195 Laboratory for Ion Beam Physics, ETH Zürich (Christl et al, 2013) …”

Section: N 189mentioning

confidence: 99%

Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age

et al. 2017

View full text Add to dashboard Cite

“…The main challenge in 36 Cl AMS measurements is its discrimination from the isobar 36 S. This is done in a multi-anode gas ionization detector and thus requires high ion energies. The TANDEM is running at 5.8 MV and ions are analysed in charge state 7+ after foil stripping, resulting in an ion energy of 46.4 MeV [18].…”

Section: Ams Measurementmentioning

confidence: 99%

Radiochemical determination of ¹²⁹I and ³⁶Cl in MEGAPIE, a proton irradiated lead-bismuth eutectic spallation target

Hammer-Rotzler¹,

Neuhausen

Vockenhuber

et al. 2015

Radiochimica Acta

View full text Add to dashboard Cite

Abstract:The concentrations of the long-lived nuclear reaction products 129 I and 36 Cl have been measured in samples from the MEGAPIE liquid metal spallation target. Samples from the bulk target material (lead-bismuth eutectic, LBE), from the interface of the metal free surface with the cover gas, from LBE/steel interfaces and from noble metal absorber foils installed in the cover gas system were analysed using Accelerator Mass Spectrometry at the Laboratory of Ion beam Physics at ETH Zürich. The major part of 129 I and 36 Cl was found accumulated on the interfaces, particularly at the interface of LBE and the steel walls of the target container, while bulk LBE samples contain only a minor fraction of these nuclides. Both nuclides were also detected on the absorber foils to a certain extent (≪ 1% of the total amount). The latter number is negligible concerning the radio-hazard of the irradiated target material; however it indicates a certain affinity of the absorber foils for halogens, thus proving the principle of using noble metal foils for catching these volatile radionuclides. The total amounts of 129 I and 36 Cl in the target were estimated from the analytical data by averaging within the different groups of samples and summing up these averages over the total target. This estimation could account for about half of the amount of 129 I and 36 Cl predicted to be produced using nuclear physics modelling codes for both nuclides. The significance of the results and the associated uncertainties are discussed.

show abstract

The ETH Zurich AMS facilities: Performance parameters and reference materials

Cited by 279 publications

References 62 publications

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age

Radiochemical determination of ¹²⁹I and ³⁶Cl in MEGAPIE, a proton irradiated lead-bismuth eutectic spallation target

Contact Info

Product

Resources

About

The ETH Zurich AMS facilities: Performance parameters and reference materials

Cited by 279 publications

References 62 publications

&lt;sup&gt;10&lt;/sup&gt;Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

&lt;sup&gt;10&lt;/sup&gt;Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

Hydrologic controls on seasonal and inter-annual variability of Congo River particulate organic matter source and reservoir age

Radiochemical determination of 129I and 36Cl in MEGAPIE, a proton irradiated lead-bismuth eutectic spallation target

Contact Info

Product

Resources

About

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

<sup>10</sup>Be systematics in the Tsangpo-Brahmaputra catchment: the cosmogenic nuclide legacy of the eastern Himalayan syntaxis

Radiochemical determination of ¹²⁹I and ³⁶Cl in MEGAPIE, a proton irradiated lead-bismuth eutectic spallation target