Rebecca Anderson

Greenslopes Private Hospital

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Jason P. Briner

University at Buffalo, State University of New York

Nathaniel A. Lifton

Purdue University West Lafayette

Davide Fontanarosa

Queensland University of Technology

Kelly Wilson‐Stewart

Queensland University of Technology

Jamie Trapp

Queensland University of Technology

Christopher Drovandi

Queensland University of Technology

Stephen B. DeVogel

Institute of Arctic and Alpine Research

Gifford H. Miller

University of Colorado Boulder

Dan Li

Shanghai Jiao Tong University

Heinrich Miller

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Cooperative Institutions

Institute of Arctic and Alpine Research

University of Colorado Boulder

Queensland University of Technology

University of Arizona

Shanghai Jiao Tong University

University of Melbourne

University of Colorado System

Planetary Science Institute

Lamont-Doherty Earth Observatory

ARC Centre of Excellence for Mathematical and Statistical Frontiers

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Geology and Geochronology of the Wollaston Lake Fold Belt in Northwestern Manitoba

Canadian Journal of Earth Sciences (1975)

Werner Weber Rebecca Anderson G. S. Clark

Recent studies in the northeastern extension of the Wollaston fold belt in Manitoba suggest that Aphebian metasedimentary rocks of the southern Churchill province comprise a geosynclinal facies that is conformably overlain by a platform facies. A possible period of emergence and embryonic Hudsonian tectonism separates this lower sequence from a blanket of continental deposits, which is probably of large regional extent and includes part of the Hurwitz Group in the District of Keewatin.Rubidium–strontium total-rock isochron ages have been obtained for five rock units in the Kasmere Lake area of Manitoba. The ages reveal that the metasedimentary rocks of the Wollaston fold belt are bounded to the east by an Archean complex comprising a differentiated hypersthene-bearing rock series having a minimum age of 2745 ± 124 Ma ( 87 Rb = 1.39 × 10 −11 yr −1 ) and a quartz monzonite unit having a minimum age of 2636 ± 163 Ma.Hudsonian igneous rocks are mostly syn- to post-kinematic. The age of 1855 ± 62 Ma for a quartz monzonite of batholithic dimension coincides with the ages of similar syntectonic Hudsonian intrusions in the Northwest Territories. The age of 1800 ± 60 Ma obtained from a pelitic gneiss unit is a minimum age for the Hudsonian metamorphism and dates the end of the Hudsonian orogeny in this part of the Churchill province. An age of 1941 ± 25 Ma for a granitic gneiss along the western margin of the Wollaston fold belt indicates early or pre-Hudsonian magmatic activity.

Quartz monzonite

Orogeny

Geochronology

10.1139/e75-155

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Citations (10)

A millennial perspective on Arctic warming from ¹⁴C in quartz and plants emerging from beneath ice caps

Geophysical Research Letters (2008)

Rebecca Anderson Gifford H. Miller Jason P. Briner Nathaniel A. Lifton Stephen B. DeVogel

Observational records show that the area of ice caps on northern Baffin Island, Arctic Canada has diminished by more than 50% since 1958. Fifty 14 C dates on dead vegetation emerging beneath receding ice margins document the persistence of some of these ice caps since at least 350 AD. In situ cosmogenic 14 C in rock surfaces, and 14 C in plant macrofossils from lake‐sediment cores demonstrate that the plateau remained ice‐free through the middle Holocene, but has supported ice caps for more than 2000 of the past 2800 years. The rapid disappearance of these ice caps over the past century, despite decreasing summer insolation, further demonstrates the unusual character of 20th Century warmth. Widespread ice‐cap expansion ∼1280 AD early in the Little Ice Age, and intensified expansion ∼1450 AD, coincide with peak stratospheric volcanic aerosol loading and reduced solar luminosity, suggesting that these mechanisms may have initiated ice‐cap growth, subsequently maintained by strong positive feedbacks.

Macrofossil

Paleoclimatology

Ice core

10.1029/2007gl032057

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Citations (81)

Rapidly Melting Ice Caps of Northern Baffin Island: Insights From Cosmogenic and Conventional Radiocarbon Dating

AGUFM (2006)

Rebecca Anderson Heinrich Miller Jason P. Briner Nathaniel A. Lifton Stephen B. DeVogel

Absolute dating

Source

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Author Correction: Taller staff occupationally exposed to less radiation to the temple in cardiac procedures, but risk higher doses during vascular cases

Scientific Reports (2020)

Kelly Wilson‐Stewart Davide Fontanarosa Dan Li Christopher Drovandi Rebecca Anderson

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Temple

10.1038/s41598-020-80349-3

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Using in situ cosmogenic 10Be, 14C, and 26Al to decipher the history of polythermal ice sheets on Baffin Island, Arctic Canada

Quaternary Geochronology (2012)

Jason P. Briner Nathaniel A. Lifton Gifford H. Miller Kurt A. Refsnider Rebecca Anderson

Cosmogenic nuclide

Deglaciation

Ice-sheet model

Greenland ice sheet

Surface exposure dating

Bedrock

Ice divide

10.1016/j.quageo.2012.11.005

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Citations (59)

Stable isotope and pollen evidence for late Quaternary climate change in southern coastal California

Rebecca Anderson

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Author Correction: Taller staff occupationally exposed to less radiation to the temple in cardiac procedures, but risk higher doses during vascular cases (Scientific Reports, (2020), 10, 1, (16103), 10.1038/s41598-020-73101-4)

Scientific Reports (2020)

Kelly Wilson‐Stewart Davide Fontanarosa Dan Li Christopher Drovandi Rebecca Anderson

George (robot)

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Taller staff occupationally exposed to less radiation to the temple in cardiac procedures, but risk higher doses during vascular cases

Scientific Reports (2020)

Kelly Wilson‐Stewart Davide Fontanarosa Dan Li Christopher Drovandi Rebecca Anderson

Abstract This study aimed to evaluate the effect of nurse and doctor height on occupational dose to the temple during fluoroscopically guided cardiovascular procedures. Additionally, an evaluation of the relationship between doctor height and table height was performed. Staff exposed during fluoroscopic procedures may be at elevated risk of cardiovascular damage or oncogenesis and have demonstrated a higher incidence of subscapular cataracts. The heads of taller staff may be exposed to reduced levels of radiation due to the increased distance from the area of highest intensity X-ray scatter. Limited research has been performed investigating height as a predictor of head dose to nursing staff. The level of radiation dose at the level of the temple to the doctor (n = 25), scrub (n = 28), and scout nurse (n = 29) was measured in a prospective single-center, observational study using Philips DoseAware badges. Procedural characteristics were recorded for vascular and cardiac cases performed in three dedicated angiography suites. Data were also collected to investigate relationships between doctor height and table height. Data were collected for 1585 cardiac and 294 vascular procedures. Staff height was a statistically significant predictor of temple dose for doctors, scrub, and scout nurses when considering the full data sample. The log temple dose demonstrated an inverse relationship to staff height during cardiac procedures, but a positive relationship for scrub and scout nurses during vascular studies. This observational study has demonstrated that taller staff are exposed to less cranial exposure dose during fluoroscopically guided cardiac examinations but has revealed a positive correlation between height and temple dose during vascular procedures. It was also determined that doctor height was correlated with average procedural table height and that vascular access point influences the choice of table elevation.

Nursing staff

10.1038/s41598-020-73101-4

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Citations (3)