Results of Radiation Monitoring in Hokkaido

Radiation levels have remained normal.
Data at 9:00 on4 24, 2014 
Click place names to see past measurements for each area. 
Units:μSv/h
Sapporo 0.029
Iwamizawa 0.042
Kutchan 0.035
Muroran 0.026
Hakodate 0.029
Obihiro 0.038
Wakkanai 0.038
Asahikawa 0.042
Abashiri 0.029
Kushiro 0.040

Reference

Survey Methods at Each Survey Site

*Radiation measurement methods and sites have changed as of April 1, 2012.
< Sapporo, Iwamizawa, Kutchan, Muroran, Hakodate, Asahikawa, Wakkanai, Abashiri, Obihiro, Kushiro >
  • Measurements are taken continually using the monitoring post of the Hokkaido Institute of Public Health building, at the request of the Ministry of Education, Culture, Sports, Science and Technology.
    You can see real-time monitoring results for sites throughout Japan, including Hokkaido, on the Ministry of Education, Culture, Sports, Science and Technology website (real-time radiation measurement system).
  • The monitoring post for Sapporo measurements is on the roof (16m high) of the Hokkaido Institute of Public Health building (Kita 19-jo Nishi 12-chome, Kita-ku, Sapporo). Measurements for other regions of Hokkaido are taken around 1m above the ground at sites in each subprefecture.
  • Measurements are taken over a period of ten minutes – for example, the 9:00 data is measured from 8:50-9:00.
    For details, see Monitoring Data from the Hokkaido Institute of Public Health.
< Tomari Nuclear Power Station >
  • Air radiation levels are regularly measured at 22 sites around the Hokkaido Electric Power Co., Inc. Tomari Nuclear Power Station, in order to monitor environmental radiation in those areas. Click site names to view detailed results (links to the Hokkaido Nuclear Energy Environmental Research Center website.)
Past measurements

Units

  • Measurements for the monitoring post are made in units of 1μGy/h (microgray per hour). However, measurements are converted using the formula 1μGy/h (microgray per hour) = 1μSv/h (micro Sievert per hour) and displayed in micro Sievert per hour on this website.
  • m (milli) = 1/1,000; μ (micro) = 1/1,000,000; n (nano) = 1/1,000,000,000.

Other

  • Radiation levels may temporarily increase on rainy days, because rain contains a small amount of natural radioactive substances.
 

Relevant Links

Monitoring data at other sites

*Information on environmental radiation monitoring data, reported by Hokkaido Nuclear Energy Environmental Research Center

  • See the "Topics" column on this page.

Information on radiation exposure, provided by the National Institute of Radiological Sciences [English is available: Please click ‘English’.]

Inquiries about Radiation Levels
Planning and Information Group, Planning and General Affairs Bureau, Hokkaido Institute of Public Health
Postal Address: Kita 19-jo Nishi 12-chome, Kita-ku, Sapporo 060-0819
Tel: 011-747-2711

Results of radiation monitoring at Hokkaido tourist attractions

Radiation levels at Hokkaido tourist attractions have remained normal. Hokkaido is as safe as it ever was,
and we hope that you will come and enjoy all that Hokkaido has to offer.
Click place names to see past measurements for each area. 
Units:μSv/h

Reference

  • Measurements are conducted in January, April, July and October (as of August 2012.)
    *Measurements are not taken at Cape Erimo during the winter due to prohibitive road conditions.
  • Radiation levels are measured at one meter above the ground.
  • Measurements for the monitoring post are made in units of 1μGy/h (microgray per hour). However, measurements are converted using the formula 1μGy/h (microgray per hour) = 1μSv/h (micro Sievert per hour) and displayed in micro Sievert per hour on this website.
  • Radiation levels may temporarily increase on rainy days, because rain contains a small amount of natural radioactive substances.
For inquiries, please contact:
Bureau of Tourism, Department of Economic Affairs, Hokkaido Government
Postal address: Kita 3-jo Nishi 6-chome, Chuo-ku, Sapporo 060-8588 Hokkaido
Tel: 011-204-5302 (Direct number)

Results of Radiation Monitoring of Tap Water

As yet, no radioactive materials have been detected.
Click place names to see past measurements for each area. 
Units:Bq/kg
*Click "Notes" below for details.
Target value for the amount of radioactive material in tap water as determined by the Ministry of Health, Labour and Welfare
Radioactive cesium
(Total of cesium-134 and -137)
10Bq(Becquerel)/kg
Radioactive iodine -*
*As radioiodine has a short half life and is currently not detected, a new taret value has not been set.
Hakodate
2014/03/25
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Nemuro
2014/03/25
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Wakkanai
2014/03/25
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Obihiro
2014/03/25
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable

Reference

Results of radiation monitoring surveys carried out on farmland in Hokkaido

Radioactive materials have either not been detectable or have been detected only in extremely small amounts,
and there have been no abnormalities.
Click place names to see past measurements for each area. 
Unit:Bq(Becquerel)/kg of dry soil
Reference: Results of past radiation monitoring surveys carried out on agricultural soil in Hokkaido for 3 years (2008-2010).
Survey location Radioactive iodine
(I-131)
Radioactive cesium
(Cs-137)
Ebetsu Not detectable 14-19Bq/kg of dry soil
2011/11/16
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
2011/11/16
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
2011/11/17
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 17.90
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 5.80
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 13.00
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 5.70
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 7.20
2013/10/07
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 12.00

Monitoring Survey Method

  1. Monitoring Period
    • "Agricultural Soil" will be collected once per month between May 7th to October 7th, 2013 (total of 6 times).
    • It takes approximately 1 week after the samples are collected for the results to be published.
  2. Sampling Method
    • Samples of agricultural soil are taken 5cm deep from the surface, using a cylindrical metal container with a height of 5cm and volume of 100mL, from five places in a patch of a field that is mostly flat and not intended to be plowed.
    • The soil samples from the five areas are mixed together to make one sample and any plant matter, roots, stones etc. found are removed.
    • No crops are grown in the area of agricultural soil being surveyed, and the area is maintained so that there is no vegetation on the surface. The samples are taken when there is no snow or puddles on the ground, and rain and snowfall are avoided.
    • Agricultural soil samples are always taken from the same patch of field, so that changes over time can be ascertained.
  3. Method and objects of radiation level analysis
    • Analysis is conducted at the Hokkaido Institute of Public Health, using the Ministry of Education, Culture, Sports, Science and Technology emergency gamma ray spectrum method.
    • Measurements by the Hokkaido Institute of Public Health are taken with a U8 vessel for 3,600 seconds (1 hour).
    • Analysis results are for iodine-131, cesium-134 and cesium-137.
  4. Definition of “Not detectable”
    • “Not detectable” means that the level of radiation is below the minimum detection level that can be displayed by the analysis device (germanium semiconductor detector) when measuring.
    • In such a case, no valid result can be obtained, and no number is displayed.
    • While “not detectable” does not necessarily mean that there is no radiation, the amount of radiation is too small to be problematic.
 

Relevant Links

Results of radiation monitoring surveys (supplementary surveys) carried out on soil in Eastern Hokkaido

Nemuro Four Northern Islands
Exchange Center of Hokkaido
(Nemuro)
2011/11/16
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Nemuro Agricultural Extension Center (Betsukai)
2011/11/16
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Kushiro Agricultural Extension Center, Kushiro Toubu Branch (Hamanaka)
2011/11/17
I-131: Not detectable
Cs-134: Not detectable
Cs-137: 17.9

Reference

  • On November 15, there was a newspaper report on a simulation of radioactive cesium 137 dispersion into the atmosphere, performed by the Association of Universities for Space Research. The results showed a high level of predicted dispersion in areas in the east of Hokkaido, such as the Kushiro and Nemuro Subprefectures.
  • Because of this, monitoring surveys were performed on November 16 and 17, using samples from three (municipally owned) sites in Eastern Hokkaido.
  • In all three sites, no abnormalities were found. The radioactive cesium levels showed no change from the environmental radiation standard survey results for the past three years. (The amount found ranged between Not Detectable and 17.9 becquerel/kg, much lower than the 100-250Bq/kg found in the simulation by the Association of Universities for Space Research.

Readings of Radioactive Materials in Seawater Sampled off Hokkaido

As yet, no radioactive substances have been detected, and there have been no abnormalities.
Click place names to see past measurements for each area. 
Units:Bq/L
*Bq (becquerel): unit of radioactivity
The legally binding maximum permissible concentration
Radioactive iodine 40Bq/L
Radioactive cesium(Cs-134) 60Bq/L
Radioactive cesium(Cs-137) 90Bq/L
Itanki Fishing Port in Muroran
2014/04/15
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Asahi Fishing Port in Samani
2014/04/15
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Tokotan Fishing Port in Akkeshi
2014/04/15
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Off Kushiro
2011/09/12
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Off Muroran
2011/09/13
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable
Off Erimo
2011/09/12
I-131: Not detectable
Cs-134: Not detectable
Cs-137: Not detectable