Cs-137Cesium 137
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As for the near-shore stations TEPCO1, 3 and 4 levels of I-131 and Cs-137 below 1.5 kBq/l have been reported.
For the six sampling points TEPCO 5 to TEPCO 10 on 6th April levels of I-131 below 0.4 kBq/l and Cs-137 below 0.2 kBq/l were measured.
Concentrations are between 5 and 18 Bq/l for I-131 and between roughly 1 and 11 Bq/l for Cs-137. For the new coverage of the coastal transect in the south, about 35 km south of Fukushima Daiini, the highest concentrations were detected at the sampling point closest to the coast in the south with about 38 Bq/l for I-131 and 4.5 Bq/l for Cs-137.
5 samples of fish were collected from the port of Choshi (Chiba prefecture) and 4 of 5 samples showed Cs-137 concentrations below limit of detection.
Radioactive substance Caesium-137 (CS-137) is used for oil and gas exploration.
The average concentration of Cs-137 is comparable to average values found earlier in the soil samples of nearby area (Peshawar 19.6 Bq/kg and Nowshera 18.4 Bq/kg) [17].
In July 2011, meat from 11 cows shipped to Tokyo from the Fukushima Prefecture was found to have 1,530 to 3,200 becquerels per kilogram of Cs-137, exceeding the Japanese legal limit of 500 becquerels per kilogram at that time.
Therefore, in the absence of effective remediation, in contaminated areas radiation levels will decline slowly over many decades, and the amount of Cs-137 will have decayed to one thousandth of the initial amount only after 300 years.
(17) Lawrence Livermore Laboratory revealed high levels of Cs-137 taken up by breadfruit and coconut crabs and lesser levels in coconuts.
Typically these use Co-60 or Cs-137 isotopes as the radiation source.