Readings of environmental radioactivity in Shizuoka Prefecture following the emergency situation at Tokyo Electric Power Fukushima Dai-ichi Nuclear Power Plant (Links to information in Portuguese, Chinese and Korean.)

平成24年5月14日 午後4時00分

Results of environmental radiation measured in Shizuoka prefecture are as follows:

For information in Portuguese, Chinese and Korean, please click the following.

• Portuguese （PDF 111.4KB）
• Chinese （PDF 97.2KB）
• Korean （PDF 191.7KB）

1 Measured results of air dose rate from 1m above ground in 12 Shizuoka prefectural facilities (as of 5 p.m. September 8, 2011)

Upon request of the Ministry of Education, Culture, Sports, Science and Technology, environmental radiation from 1m above ground in 12 locations throughout the prefecture was measured once during a four-day period （September 5-8） using a portable survey meter. The measured results are as follows.

[Units: microsievert per hour （μSv/h）]

• Minaguchi-cho, Atami　0.071　(1時15分 p.m. September 6, 2011)
• Yukawa, Ito　0.059　(2時10分 p.m. September 6, 2011)
• Takashimahoncho, Numazu　0.059　(2時55分 p.m. September 7, 2011)
• Kamado, Gotemba　0.038　(10時35分 a.m. September 6, 2011)
• Motoichiba, Fuji　0.061　(10時55分 a.m. September 8, 2011)
• Yugashima, Izu　0.050　(1時30分 p.m. September 7, 2011)
• Naka, Shimoda　0.069　(8時50分 a.m. September 7, 2011)
• Ena, Matsuzaki　0.042　(11時15分 a.m. September 7, 2011)
• 1-chome Yatsucho, Shimizu-ku, Shizuoka　0.042　(0時05分 p.m. September 8, 2011)
• Setoaraya, Fujieda　0.065　(3時15分 p.m. September 5, 2011)
• Mitsuke, Iwata　0.042　(1時40分 p.m. September 5, 2011)
• 1-chome Chuo, Naka-ku, Hamamatsu　0.036　(1時00分 p.m. September 5, 2011)

Shizuoka City’s usual band of fluctuation: 0.0281-0.0765 μSv/h

National survey of environmental radioactivity level standards by the Ministry of Education, Culture, Sports, Science and Technology from 2007-2009—minimum value: 0.0133 μSv/h, maximum value: 0.153 μSv/h

2 Measured results from 9 a.m. December 27, 2011 to 9 a.m. December 28, 2011 of collected fallout (radioactive dust) (as of　5 p.m. December 28, 2011).

[Units: Bq/m2 （becquerel per square meter）] ND=not detectable

Iodine-131: ND, Cesium-137: ND, Cesium-134: ND　（Measurement location: Ikeshinden, Omaezaki）

Measurements on March 22 detected an infinitesimal amount of radioactive material thought to have originated from Fukushima Dai-ichi Nuclear Power Plant. Analysis of the increase in air dose rate from the radioactive material, including radioactive materials following the initial crisis until today, has resulted in a total of approximately 0.000002mGy/h （approx.0.002μGy/h）. Should this situation continue for one year, the effective exposure dose from radioactive material would be approximately 0.014mSv （millisievert） （approx. 14μSv （microsievert））, approximately 1/70 of the 1mSv annual exposure dose limit.

Including infants, these levels do not have a negative influence on one ’s health.

3 Measured results from December 28, 2011 of drinking water (as of　5 p.m. December 28, 2011)

 [Units: Bq/kg (becquerel per kilogram)] ND=not detectable

• Kita Ando, Shizuoka—Iodine-131:ND, Cesium-137:ND
• Nakajima, Mishima—Iodine-131:ND, Cesium-137:ND (as of 5 p.m. December 27, 2011)
• Ōka, Shimada—Iodine-131:ND, Cesium-137:ND (as of 5 p.m. December 27, 2011)
• Teradani, Iwata—Iodine-131:ND, Cesium-137:ND (as of 5 p.m. December 27, 2011)
• Usami, Ito—Iodine-131:ND, Cesium-137:ND (as of 5 p.m. December 27, 2011)
• Inatori, Higashi Izu-cho—Iodine-131:ND, Cesium-137:ND (as of 5 p.m. December 27, 2011)
• Kouchi, Shimoda—Iodine-131:ND, Cesium-137:ND )(as of 5 p.m. December 27, 2011)

Only measurements from March 22 detected infinitesimal amounts of Iodine-131 (0.14Bq/kg) thought to have resulted from Fukushima Dai-ichi Nuclear Power Plant. From this, the exposure dose would be approximately 0.0000055mSv (millisievert) (approx. 0.0055μSv (microsievert)), approximately 1/180,000 of the 1mSv annual exposure dose limit.

After May 1, water measurements will be carried out only once a week on Tuesday (excluding　Kita Ando). However, in the case of an emergency, measurements will be carried out daily in all locations.

Including infants, these levels do not have a negative influence on one’s health.

4 Measured results from 10 a.m. March 1, 2011to 10 a.m. April 1, 2012 of collected fallout (radioactive dust) (as of 5 p.m. April 27, 2012).

[Units: Bq/m2 (becquerel per square meter)] ND=not detectable

• 4.1 Measured results from 10 a.m. March 1, 2011 to 10 a.m. April 1, 2011 of collected fallout (as of 5 p.m. April 27, 2011).
  Iodine-131: 1,100, Cesium-137: 540, Cesium-136: 36, Cesium-134: 550 (Measurement location: Kita Ando, Shizuoka)
• 4.2 Measured results from 10 a.m. April 1, 2011 to 10 a.m. May 2, 2011 of collected fallout (as of 5 p.m. May 19, 2011).
  Iodine-131: 17, Cesium-137: 86, Cesium-136: 1.1, Cesium-134: 87 (Measurement location: Kita Ando, Shizuoka)
• 4.3 Measured results from 10 a.m. May 2, 2011 to 10 a.m. June 1, 2011 of collected fallout (as of 5 p.m. June 17, 2011).
  Iodine-131: 0.47, Cesium-137: 12, Cesium-136: ND, Cesium-134: 11 (Measurement location: Kita Ando, Shizuoka)
• 4.4 Measured results from 10 a.m. June 1, 2011 to 10 a.m. July 1, 2011 of collected fallout (as of 5 p.m. July 20, 2011).
  Iodine-131: ND, Cesium-137: 3.4, Cesium-136: ND, Cesium-134: 3.3 (Measurement location: Kita Ando, Shizuoka)
• 4.5 Measured results from 10 a.m. July 1, 2011 to 10 a.m. August 1, 2011 of collected fallout (as of 5 p.m. August 31, 2011).
  Iodine-131: ND, Cesium-137: 1.9, Cesium-136: ND, Cesium-134: 1.8 (Measurement location: Kita Ando, Shizuoka)
• 4.6 Measured results from 10 a.m. August 1, 2011 to 10 a.m. September 1, 2011 of collected fallout (as of 5 p.m. September 26, 2011).
  Iodine-131: ND, Cesium-137: 1.7, Cesium-136: ND, Cesium-134: 1.5 (Measurement location: Kita Ando, Shizuoka)
• 4.7 Measured results from 10 a.m. September　1, 2011 to 10 a.m.　October 3, 2011 of collected fallout (as of 5 p.m. October 31, 2011).
  Iodine-131: ND, Cesium-137: 1.0, Cesium-136: ND, Cesium-134: 0.9 (Measurement location: Kita Ando, Shizuoka)
• 4.8 Measured results from 10 a.m. October　3, 2011 to 10 a.m.　November 1, 2011 of collected fallout (as of 5 p.m. November 21, 2011).
  Iodine-131: ND, Cesium-137: 0.38, Cesium-136: ND, Cesium-134: 0.3 (Measurement location: Kita Ando, Shizuoka)
• 4.9 Measured results from 10 a.m. November　1, 2011 to 10 a.m.　December 1, 2011 of collected fallout (as of 5 p.m. December 20, 2011).
  Iodine-131: ND, Cesium-137: 0.84, Cesium-136: ND, Cesium-134: 0.74 (Measurement location: Kita Ando, Shizuoka)
• 4.10 Measured results from 10 a.m. December　1, 2011 to 10 a.m.　January 4, 2012 of collected fallout (as of 5 p.m. January 20, 2012).
  Iodine-131: ND, Cesium-137: 0.45, Cesium-136: ND, Cesium-134: 0.38 (Measurement location: Kita Ando, Shizuoka)
• 4.11 Measured results from 10 a.m. January　4, 2012 to 10 a.m. February 1, 2012 of collected fallout (as of 5 p.m. February 29, 2012).
  Iodine-131: ND, Cesium-137: 0.45, Cesium-136: ND, Cesium-134: 0.38 (Measurement location: Kita Ando, Shizuoka)
• 4.12 Measured results from 10 a.m. February　1, 2012 to 10 a.m. March 1, 2012 of collected fallout (as of 5 p.m. March 30, 2012).
  Iodine-131: ND, Cesium-137: 0.63, Cesium-136: ND, Cesium-134: 0.44 (Measurement location: Kita Ando, Shizuoka)
• 4.13 Measured results from 10 a.m. March　1, 2012 to 10 a.m. April 1, 2012 of collected fallout (as of 5 p.m. April 27, 2012).
  Iodine-131: ND, Cesium-137: 0.39, Cesium-136: ND, Cesium-134: 0.48 (Measurement location: Kita Ando, Shizuoka)

The measurements detected a trace amount of radioactive material thought to have originated from Fukushima Dai-ichi Nuclear Power Plant. Analysis of the increase in air dose from the radioactive material has resulted in a total of approximately 0.035mGy (approx.35μGy). the effective exposure dose from radioactive material would be approximately 0.025mSv (millisievert) (approx. 25μSv (microsievert)), approximately 1/40 of the 1mSv annual exposure dose limit.

Including infants, these levels do not have a negative influence on one’s health.

Shizuoka Prefecture’s Environmental Radiation Monitoring Center is monitoring environmental radioactivity around Hamaoka Nuclear Power Plant 24 hours a day.

Including infants, these levels do not have a negative influence on one’s health.