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1. Comparison of the scavenging intensity, remineralization and residence time of 210Po and 210Pb at key zones (biotic, sediment-water and hydrothermal) along the East Pacific GEOTRACES transect

Author:
Baskaran, Mark,   et al.   ; Niedermiller, John;     Show all 2 Author
Source:
Journal of environmental radioactivity 2019 v.198 pp. 165-188
ISSN:
0265-931X
Subject:
aerosols; geochemistry; inventories; iron; lead; manganese; particulates; polonium; progeny; radioactivity; radionuclides; radium; radon; seawater; surface water; United States
Abstract:
... The contrasting geochemical behavior of two long-lived progeny of 222Rn (daughter product of 226Ra), 210Po and 210Pb, provide valuable insights on the extent of recycling of biogenic particulate matter and their preferential removal from the water column. We collected and analyzed 135 water samples from six vertical profiles for 210Po and 210Pb as well as a suite of aerosol samples for 210Pb along ...
DOI:
10.1016/j.jenvrad.2018.12.016

2. Inconsistencies between 14C and short-lived radionuclides-based sediment accumulation rates: Effects of long-term remineralization

Author:
Baskaran, M.,   et al.   ; Bianchi, T.S.; Filley, T.R.;     Show all 3 Authors
Source:
Journal of environmental radioactivity 2017 v.174 pp. 10-16
ISSN:
0265-931X
Subject:
biogeochemical cycles; carbon; cesium; geophysics; inventories; lakes; lead; mixing; organic matter; radioactivity; radiocarbon dating; radionuclides; sediments; Florida
Abstract:
... ¹⁴C is the most widely utilized geochronometer to investigate geological, geochemical and geophysical problems over the past 5 decades. Establishment of precise sedimentation rates is crucial for the reconstruction of paleo-climate, -ecological and – environmental studies when extrapolation of sedimentation rates is utilized for time scales beyond the dating range. However, agreement between short ...
DOI:
10.1016/j.jenvrad.2016.07.028

3. 210Po and 210Pb disequilibrium at the PN section in the East China Sea

Author:
Baskaran, Mark,   et al.   ; Su, Kaijun; Du, Jinzhou; Zhang, Jing;     Show all 4 Authors
Source:
Journal of environmental radioactivity 2017 v.174 pp. 54-65
ISSN:
0265-931X
Subject:
autumn; continental shelf; detritus; estuaries; feces; fractionation; lead; marine environment; particulates; plankton; polonium; radioactivity; radionuclides; tracer techniques; turbidity; East China Sea
Abstract:
... Lead-210 and ²¹⁰Po have been widely used as tracers for quantifying particulate scavenging in the upper layer of the oceanic water column. In this study, we investigated the ²¹⁰Po/²¹⁰Pb disequilibrium in the water column of the PN section in the East China Sea (ECS) during autumn 2013. In most of the water column, a deficiency of ²¹⁰Po was observed with respect to its parent nuclide ²¹⁰Pb (i.e., a ...
DOI:
10.1016/j.jenvrad.2016.07.031

4. The effect of spatially varying velocity field on the transport of radioactivity in a porous medium

Author:
Baskaran, R.,   et al.   ; Sen, Soubhadra; Srinivas, C.V.; Venkatraman, B.;     Show all 4 Authors
Source:
Journal of environmental radioactivity 2016 v.162-163 pp. 285-288
ISSN:
0265-931X
Subject:
groundwater; porous media; radioactive waste; radioactivity
Abstract:
... In the event of an accidental leak of the immobilized nuclear waste from an underground repository, it may come in contact of the flow of underground water and start migrating. Depending on the nature of the geological medium, the flow velocity of water may vary spatially. Here, we report a numerical study on the migration of radioactivity due to a space dependent flow field. For a detailed analys ...
DOI:
10.1016/j.jenvrad.2016.05.036

5. Investigations of the partitioning and residence times of Po-210 and Pb-210 in a riverine system in Southeast Michigan, USA

Author:
Baskaran, M.,   et al.   ; Mudbidre, R.; Schweitzer, L.;     Show all 3 Authors
Source:
Journal of environmental radioactivity 2014 v.138 pp. 375-383
ISSN:
0265-931X
Subject:
fractionation; lakes; lead; particulates; polonium; radionuclides; rivers; tracer techniques; watersheds; Michigan
Abstract:
... Some of the daughter products in the 222Rn-decay series, such as 210Po and 210Pb, have been widely used as tracers and chronometers in aqueous systems. We measured the concentrations of 210Pb and 210Po in the dissolved (≤0.5 μm), bulk (unfiltered) and particulate phases (≥1 μm) collected in the Clinton River in the Lake St. Clair watershed in Southeast Michigan in order to investigate their partit ...
DOI:
10.1016/j.jenvrad.2014.01.007

6. Numerical simulation of the transport of a radionuclide chain in a rock medium

Author:
Baskaran, R.,   et al.   ; Sen, Soubhadra; Srinivas, C.V.; Venkatraman, B.;     Show all 4 Authors
Source:
Journal of environmental radioactivity 2015 v.141 pp. 115-122
ISSN:
0265-931X
Subject:
advection; daughters; equations; mathematical models; nuclides; wastes
Abstract:
... For the safe disposal of High Level Waste (HLW), a common practice is to bury the sealed container called canister containing the concentrated and vitrified waste deep inside the earth surface within a rocky medium. In the event of an accidental breach of such a canister, the sealed waste may come in contact of pore water. If this happens, then the parent nuclides present in the HLW and their daug ...
DOI:
10.1016/j.jenvrad.2014.12.006

7. Problems with the dating of sediment core using excess 210Pb in a freshwater system impacted by large scale watershed changes

Author:
Baskaran, Mark,   et al.   ; Nix, Joe; Kuyper, Clark; Karunakara, N.;     Show all 4 Authors
Source:
Journal of environmental radioactivity 2014 v.138 pp. 355-363
ISSN:
0265-931X
Subject:
cesium; freshwater; lakes; mercury; mining; mixing; pollution; radionuclides; sediments; watersheds; Arkansas
Abstract:
... Pb-210 dating of freshwater and coastal sediments have been extensively conducted over the past 40 years for historical pollution reconstruction studies, sediment focusing, sediment accumulation and mixing rate determination. In areas where there is large scale disturbance of sediments and the watershed, the vertical profiles of excess 210Pb (210Pbxs) could provide erroneous or less reliable infor ...
DOI:
10.1016/j.jenvrad.2014.07.006

8. Simulation of radioactive plume gamma dose over a complex terrain using Lagrangian particle dispersion model

Author:
Baskaran, R.,   et al.   ; Rakesh, P.T.; Venkatesan, R.; Hedde, Thierry; Roubin, Pierre; Venkatraman, B.;     Show all 6 Authors
Source:
Journal of environmental radioactivity 2015 v.145 pp. 30-39
ISSN:
0265-931X
Subject:
air; meteorological parameters; simulation models; France
Abstract:
... FLEXPART-WRF is a versatile model for the simulation of plume dispersion over a complex terrain in a mesoscale region. This study deals with its application to the dispersion of a hypothetical air borne gaseous radioactivity over a topographically complex nuclear site in southeastern France. A computational method for calculating plume gamma dose to the ground level receptor is introduced in FLEXP ...
DOI:
10.1016/j.jenvrad.2015.03.021

9. Mobility of Po and U-isotopes under acid mine drainage conditions: an experimental approach with samples from Río Tinto area (SW Spain)

Author:
Baskaran, M.,   et al.   ; Barbero, L.; Gázquez, M.J.; Bolívar, J.P.; Casas-Ruiz, M.; Hierro, A.; Ketterer, M.E.;     Show all 7 Authors
Source:
Journal of environmental radioactivity 2014 v.138 pp. 384-389
ISSN:
0265-931X
Subject:
acid mine drainage; composite materials; leaching; pH; polonium; pyrite; radionuclides; rocks; sediments; solubility; stream channels; sulfuric acid; watersheds; Spain
Abstract:
... Under acid mine drainage (AMD) conditions, the solubilities and mobilities of many elements are vastly different from conditions prevailing in most natural waters. Studies are underway in the Río Tinto area (Iberian Pyrite Belt), in order to understand the behavior and mobility of long-lived U-series radionuclides under AMD conditions. A set of leaching experiments utilizing typical country rocks ...
DOI:
10.1016/j.jenvrad.2013.11.004

10. Application of 234U/238U activity ratios to investigations of subterranean groundwater discharge in the Cádiz coastal area (SW Spain)

Author:
Baskaran, M.,   et al.   ; Rodrigo, J.F.; Casas- Ruiz, M.; Vidal, J.; Barbero, L.; Ketterer, M.E.;     Show all 6 Authors
Source:
Journal of environmental radioactivity 2014 v.130 pp. 68-71
ISSN:
0265-931X
Subject:
coastal water; coasts; estuaries; groundwater; mixing; rivers; seawater; villages; Spain
Abstract:
... The activity ratios of 234U/238U were used to investigate processes of subterranean groundwater discharge into coastal marine waters in a study location at Bay of Cádiz (southwest Spain). Marine waters in the bay and surrounding open ocean exhibited U concentrations of 3.4 ± 0.1 μg/L and activity ratios of 1.15 ± 0.01, in agreement with the expected composition of seawater (234U/238U activity rati ...
DOI:
10.1016/j.jenvrad.2014.01.004