Environmental Radiation Database

Condition Selection

You can search for the results of environmental radioactivity surveys conducted by the Secretariat of the Nuclear Regulation Authority with the cooperation of relevant ministries and prefectural governments.
Data registered in the Environmental Radiation Database is checked and assessed by specialists or staff of the relevant ministry or prefectural government.
Counting of applicable data starts once you made selections for all mandatory items.

Survey PeriodMandatory

Please specify the period of survey to search.

Year : Month : to Year : Month :

Survey RegionMandatory

You can select any prefectures (multiple choice allowed). You can also select “Nationwide” to see data for the whole country.

Survey Region

Survey SampleMandatory

Please select one sample (category) to search.
Once you select a sample (category), a list of samples (subcategory) will be shown. You can select multiple samples (subcategory).

Sample (category)

Samples (subcategory)

Survey NuclideMandatory

Please select the type of radionuclides to search. You can select multiple nuclides.

Survey Nuclide
Deselect All

This does not have to be selected

Surveys to Use in Your SearchOptional

You can select surveys to use in your search. If no selection is made, all surveys will be included in the search.
For the details of the surveys, see List of Survey Details.

Surveys to Use in Your Search
  • General environment

  • Nuclear facilities

  • Nuclear powered warships