Title: Observation of gamma-rays from fallout collected at Ibaraki, Japan, during the Fukushima nuclear accident
Source: Applied Radiation and Isotopes
Authors: Jun Saegusaa, Yasuaki Kikutab, Hitoshi Akinob
Date: July 2013
Gamma-ray pulse height distributions were measured for a fallout sample collected at Ibaraki, Japan, during the Fukushima accident in March 2011. The fallout was collected in a pan of water and then evaporated to dryness on a stainless-steel holder. The sample was measured by a germanium detector three times over a year. In the pulse height distribution of the initial measurement, approximately 140 peaks were observed in the 50-2048keV energy region. Most of these peaks were either total absorption peaks or sum peaks of Te, I or Cs isotopes. Unlike fallout samples at the past nuclear accidents, nuclides such as Ce and Ru were not detected whereas 110mAg was prominently observed. The radioactivity concentration of 137Cs was determined to be at least 1.4×104Bqm-2, approximately 14% of which was attributed to rainout.
See also: Scientists: First time radioactive silver detected in ocean -- Radioactivity levels in seawater are not diminishing as hoped -- "Reactor site still seems to be leaking; it hasn't shut off"
Published: March 27th, 2013 at 10:08 pm ET
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