Cs 137 Sediment Dating

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Sediment dating with 137Cs / Sample Processing . . .
The use of 137Cs in marine and lacustrine sediment dating
137Cs and 210Pb dating of sediments from soft-water lakes . . .
Post‐deposition diffusion of 137 Cs in lake sediment . . .
Caesium-137 and lead-210 dating of recent sediments from . . .
210Pb and 137Cs dating methods in lakes: A retrospective . . .
Chernobyl 137 Cs used to determine sediment accretion . . .
Challenges and limitations of the 210Pb sediment dating . . .
Post‐deposition diffusion of 137 Cs in lake sediment . . .
Caesium-137 - Wikipedia
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Sediment dating with 137Cs This technique exploits the injection of radioisotopes into the atmosphere, which occurred during atmospheric nuclear testing, mainly in the late 1950s and mid 1960s . It uses this injection as a marker to identify soil and sediment particles laid down at that time .
In areas where sediments accumulate the radionuclides have been slowly buried, and in many areas a clear 137 Cs peak is seen at a given depth in the sediment and can be used to date sediment . . .
Additional dating of the New England cores was based on chronostratigraphic pollen markers . The profiles in sediment of 137 Cs deviate greatly from expectations based on fallout history . The profiles have their maxima at the surface, and 137 Cs occurs at depths dated by 210 Pb and pollen as many decades older than the beginning of 137 Cs
The sediment record reveals how Chernobyl 137 Cs incorporated into the 1986 varve diffused downwards in the core at a decreasing rate over time, whereas the surface sediments continued to receive inputs of 137 Cs mobilized from the catchment soils or lake margin . In spite of these processes, all cores post‐dating the Chernobyl accident had a clear and well‐resolved peak in the 1986 varve, justifying the use of this feature as a fixed chronostratigraphic feature .
Mean annual sedimentation rates over the last 20-30 years were determined in the pre-alpine Mondsee (Upper Austria) using Cs - 137 and Pb (Po)-210 profiles for sediment core dating and two natural sediment markers . Lower sedimentation rates of about 2-3 mm yr −1 were observed in the central part of the lake near the shore at 18-20 m and in the . . .
137 Cs dating is used to confirm sediment accumulation rates in the recent cores . In the three Connecticut, USA, lakes studied, sediment accumulation rates changed abruptly to higher values between 40-50 yrs ago (increasing by factors of 2 .2, 2 .9, and 3 .0) .
137 Cs dating was used to assess sediment accretion rates, including rates based on the 137 Cs peak from the 1986 accident at Chernobyl . Peaks from the Chernobyl fallout were found in cores from the Oder and Vistula Rivers in Poland, from the Eastern Scheldt in the Netherlands, and in one of the two cores from Stiffkey Marsh, U .K .
137 Cs maxima could have been used as a chronostratigraphic marker to confirm the 210 Pb derived age model, or to correct the model and assumptions during dating . However, 137 Cs massic activity depth profiles might have also been altered by catchment-derived inputs, post-depositional remobilization, organic matter degradation or even in some cases, 137 Cs activity might be below the detection limit (Ruiz-Fernández et al ., 2012; Ruiz Fernández et al ., 2019 and references therein) .
The sediment record reveals how Chernobyl 137 Cs incorporated into the 1986 varve diffused downwards in the core at a decreasing rate over time, whereas the surface sediments continued to receive inputs of 137 Cs mobilized from the catchment soils or lake margin . In spite of these processes, all cores post‐dating the Chernobyl accident had a . . .
As an almost purely man-made isotope, caesium- 137 has been used to date wine and detect counterfeits and as a relative- dating material for assessing the age of sedimentation occurring after 1945 . Caesium- 137 is also used as a radioactive tracer in geologic research to measure soil erosion and deposition .
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Cs 137 Sediment Dating