Results of the Nuclide Analysis of Soil Sampling at 2,200 Locations in Fukushima Prefecture and Neighboring Prefectures
Decay correction: June 14, 2011   The Ministry of Education, Culture, Sports, Science and Technology

The analysis results show radiation (Bq) per unit area (m2) i.e., "Deposition" (a depth of 5 cm) . Due to environmental radiation intensity and scheduling, the number of samples a...
  1. The analysis results show radiation (Bq) per unit area (m2) i.e., "Deposition" (a depth of 5 cm) .
  2. Due to environmental radiation intensity and scheduling, the number of samples at each point varied from one to seven. The standard was five samples.
  3. The deposition measurement procedures
    • 134Cs, 137Cs and 131I
      All samples were measured
    • 110mAg and 129mTe
      Sampling points where detection of these nuclides were expected were chosen based on the analysis results of 134Cs, 137Cs and 131I (approximately 1,200 points) and all samples were measured at each sampling point.
    • 89Sr,90Sr,238Pu and 239Pu+240Pu
      Because of the long measurement time required, sampling points where detection of these nuclides were expected were chosen (100 points) and then only one sample was measured out of samples taken at each sampling point.
  4. Deposition density, error, detection limit and average deposition are decay-compensated values as of June 14, 2011.
  5. "ND" in the column "Deposition", "-" in the column "Error", and detection limit value as reference in the column "detection limit": The peak of relevant nuclide was not clearly detected or calculated deposition was equal to or below 0.0.
  6. Reference value in the column "Deposition" smaller than the detection limit in the column "detection limit": The peak of the relevant nuclide was detected even though the calculated deposition was below detection limit.
  7. The averaging procedure of the deposition densities
    • 134Cs and 137Cs
      The arithmetic average using values equal to or above the detection limit.
    • 131I, 110mAg and 129mTe
      Arithmetic average including values below the detection limit when at least one measured value was equal to or above the detection limit in soil samples.
    • 89Sr,90Sr,238Pu and 239Pu+240Pu
      Even though only one sample was measured out of samples taken at each sampling point, the result was used as average.
CSV files that have common item names over different survey projects for comparison analyses.