Radiocesium Concentrations In Shallow Water Sediments (Matsukawa-Ura Lagoon, Fukushima, Japan) From A Compact Nai(Tl) Scintillation Spectrometer

We collected continuous sedimentary Cs-137 concentration data from a shallow fishery ground (Matsukawa-ura Lagoon, Fukushima, Japan) in 2016 using a new compact underwater NaI(Tl) scintillation spectrometer and a quantitative technique. Cs-137 concentrations in sediments were low (approx. 40 Bq/kg DW) at the lagoon mouth and high (641.2 Bq/kg DW) at the head of the lagoon. Some areas of locally elevated Cs-137 concentrations (>500 Bq/kg DW) were also found.