毎日の降下物(塵や雨)中の放射性物質検査結果
Levels of radioactive materials in the fallout obtained everyday

The sampling and measurement are conducted at the Tokyo Metropolitan Institute of Public Health (Hyakunin-cho, Shinjuku-ku, Tokyo)

Sampling date 131I
Bq/m2
Radioactive Cesium
134Cs
Bq/m2
137Cs
Bq/m2
15:00, 28 Apr., 2017 - 15:00, 29 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 27 Apr., 2017 - 15:00, 28 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 26 Apr., 2017 - 15:00, 27 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 25 Apr., 2017 - 15:00, 26 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 24 Apr., 2017 - 15:00, 25 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 23 Apr., 2017 - 15:00, 24 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 22 Apr., 2017 - 15:00, 23 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 21 Apr., 2017 - 15:00, 22 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 20 Apr., 2017 - 15:00, 21 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 19 Apr., 2017 - 15:00, 20 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 18 Apr., 2017 - 15:00, 19 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 17 Apr., 2017 - 15:00, 18 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 16 Apr., 2017 - 15:00, 17 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 15 Apr., 2017 - 15:00, 16 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 14 Apr., 2017 - 15:00, 15 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 13 Apr., 2017 - 15:00, 14 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 12 Apr., 2017 - 15:00, 13 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 11 Apr., 2017 - 15:00, 12 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 10 Apr., 2017 - 15:00, 11 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 09 Apr., 2017 - 15:00, 10 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 08 Apr., 2017 - 15:00, 09 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 07 Apr., 2017 - 15:00, 08 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 06 Apr., 2017 - 15:00, 07 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 05 Apr., 2017 - 15:00, 06 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 04 Apr., 2017 - 15:00, 05 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 03 Apr., 2017 - 15:00, 04 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 02 Apr., 2017 - 15:00, 03 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
15:00, 01 Apr., 2017 - 15:00, 02 Apr., 2017 ND(not detectable) ND(not detectable) ND(not detectable)
  • Samples are collected and analyzed everyday using a germanium semiconductor detector.
  • It is known that rainfall may increase values.
  • The number of significant digits of values is set as 2 in order to be consistent with that of the Japanese Government.
  • Please see here about the principle behind “ND (Not Detectable)”.
  • A unit of values is Bq/m2, identical to MBq/km2.


Please see the pages for each year for data from previous surveys