Pre-assessment of the speciation of 60Co, 125Sb, 137Cs and 241Am in a contaminated aquifer

Mankarios, George

doi:10.1016/j.jenvrad.2004.02.002

Cited by 21 publications

(2 citation statements)

References 21 publications

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“…A review of the relevant literature confirms that the artificial radionuclides, caesium‐134 ( 134 Cs) ( t 0.5 = 2 · 06 years; measured at 604 keV) and cobalt‐60 ( 60 Co) ( t 0.5 = 5 · 26 years; measured at 1171 keV) satisfy the criteria outlined earlier (Cremers et al ., ; Avery, ; Matishov et al ., ; Real et al ., ; Galabov et al ., ; Khan, ; Caron and Mankarios, ; Payne et al ., ; Shinonaga et al ., ; Whicker and Ibrahim, ; Chen and Lu, ). Although both radionuclides have previously been used as sediment tracers (e.g.…”

Section: Introductionmentioning

confidence: 99%

Using caesium‐134 and cobalt‐60 as tracers to assess the remobilization of recently‐deposited overbank‐derived sediment on river floodplains during subsequent inundation events

Greenwood

Walling

Quine

2013

Earth Surf Processes Landf

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River floodplains act as sinks for fine‐sediment and sediment‐associated contaminants. Increasing recognition of their environmental importance has necessitated a need for an improved understanding of the fate and residence times of overbank sediment deposits over a broad range of timescales. Most existing investigations have focused on medium‐term accretion rates, which represents net deposition from multiple flood events over several decades. In contrast, the fate of recently‐deposited sediment during subsequent overbank events has received only limited attention. This paper presents a novel tracing‐technique for documenting the remobilization of recent overbank sediment on river floodplains during subsequent inundation events, using the artificial radionuclides, caesium‐134 (134Cs) and cobalt‐60 (60Co). The investigation was conducted within floodplains of the Rivers Taw and Culm in Devon, UK. Small quantities of fine‐sediment (< 63 µm dia.), pre‐labelled with known activities of either 134Cs or 60Co, were deposited at 15 locations across each floodplain. Surface inventories, measured before and after three consecutive flood events, were used to estimate sediment loss (in g m–2). Significant reductions provided evidence of the remobilization of the labelled sediment by inundating floodwaters. Spatial variations in remobilization were related to localized topography. Sediment remobilized during the first two events for the River Taw floodplain were equivalent to 63 · 8% and 11 · 9%, respectively, of the original mass. Equivalent values for the River Culm floodplain were 49 · 6% and 12 · 5%, respectively, of the original mass. Sediment loss during the third event proved too small to be attributed to remobilization by overbank floodwaters. After the third event, a mean of 22 · 5% and 35 · 2% of the original mass remained on the Taw and Culm floodplains, respectively. These results provide evidence of the storage of the remaining sediment. The findings highlight the importance of remobilization of recently‐deposited sediment on river floodplains during subsequent overbank events and demonstrate the potential of the tracing‐technique. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Using caesium‐134 and cobalt‐60 as tracers to assess the remobilization of recently‐deposited overbank‐derived sediment on river floodplains during subsequent inundation events

Greenwood

Walling

Quine

2013

Earth Surf Processes Landf

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“…The natural and artificial radionuclides content was analyzed for gamma emitters using a Canberra GC1020 high purity Ge detector, controlled by a DSA-1000 processor and Genie 2000 software ( Caron and Mankarios, 2004 ; Caron et al., 2007 ). Finely ground air-dried lichens in petri dishes (d = 5 cm, sample depth ∼1.5 mm) were placed directly on top of the detector.…”

Section: Methodsmentioning

confidence: 99%