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, Cs-137), cesium-137, or radiocaesium, is a radioactive isotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.

It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves and spreads in nature due to the high water solubility of caesium's most common chemical compounds, which are salts. The remainder directly populates the ground state of barium-137, which is stable.

As a man-made isotope, caesium-137 has been used to date wine and detect counterfeits A 1972 experiment showed that when dogs are subjected to a whole body burden of 3800 μCi/kg (140 MBq/kg, or approximately 44 μg/kg) of caesium-137 (and 950 to 1400 rads), they die within 33 days, while animals with half of that burden all survived for a year. Together with caesium-134, iodine-131, and strontium-90, caesium-137 was among the isotopes distributed by the reactor explosion that constitute the greatest risk to health.

The mean contamination of caesium-137 in Germany following the Chernobyl disaster was 2000 to 4000 Bq/m As of 2016 the Chernobyl caesium-137 has decayed by half, but can have been locally concentrated by much larger factors.

The aim of this work was to determine the sedimentation rate in order to evaluate the progress of eutrophication for St.

Ana Lake (Ciomad Mountain near the Băile Tuşnad in Harghita County (Romania)).

Sedimentation rates of Dianchi Lake are determined by 137Cs dating.

However, 137Cs vertical distribution in sediment cores of Dianchi Lake has special characteristics because Dianchi Lake is located on the southeast of the Qinghai-Tibet Plateau, the Kunming quasi-stationary front is over the borders of Yunnan and Guizhou where the specific precipitation is distributed.

Office of Water Research and Technology (A-048-ME; A-053-ME), Maine Life Sciences and Agriculture Experiment Station (Hatch-ME08465), and the Center for Field Research (Earthwatch).

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.

This is particularly applicable in dating sediment accumulation rates for geohazard analysis in subsea engineering projects.

Most suitable for dating undisturbed sediments less that about 60 years old. Cs peaked between 19 as a result of the atmospheric nuclear explosions and later by the 1986 Chernobyl accident.

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