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About the website
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QHow can I contact you?
A Please use the "Contact Us" form on this website. When submitting your opinions or questions about this website via the "Contact Us" form, be sure to enter your name and email address.
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QWhat languages does the website support?
A The website supports two languages: Japanese and English. You can switch between languages using the "English/Japanese" option at the bottom of the side menu.
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QCan the text size on the website be changed?
A You can change the text size using the "Text Size" option at the bottom of the side menu, which offers three options: Large, Medium, and Small.
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QCan the background color be changed?
A You can change the background color using the "Background Color" option at the bottom of the side menu, which offers White, Black, and Blue.
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QCan I search within the site?
A To search the site, click the "Search" icon at the bottom of the side menu and enter a keyword.
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QWhen I tried to use the "Search from current location" feature, the message "Location information use is not permitted" appeared.
A The "Search from current location" feature uses GPS functionality on devices such as PCs or smartphones. Please check your device settings and enable GPS functionality.
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QI would like to cite the content of this website in a paper or other publication.
A Please refer to the "Important Notes for Use" section in the Site Policy.
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Q I would like to obtain a brochure for the website.
A It is currently under preparation. Once completed, it will be posted on this website for download and use.
About the database
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QWhen selecting items in the "Environmental Radiation Database," the number of relevant data entries is not displayed.
A The number of relevant data entries is counted only after all required fields (survey period, survey area, survey sample, and survey radionuclide) have been selected. Please select all required fields.
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QWhat kind of data is registered in the "Environmental Radiation Database"?
A The results of environmental radiation surveys conducted by the Nuclear Regulation Authority in collaboration with relevant government agencies and the 47 prefectures are registered in the database. For details on the environmental radiation surveys, please refer to the "Survey Results in the Database."
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QWhen I saved the search results from the "Environmental Radiation Database" as a CSV file, some data that was not displayed on the screen was included. Why is that?
A The search results displayed on the website show only the main items. When saved as a CSV file, however, all items—including the main ones—can be confirmed.
Content of the database
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QHow frequently is the "Environmental Radiation Database" updated?
A Data registration is conducted throughout the year, with database updates performed approximately once a month.
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QHow frequently are revisions made to the series of radiation measurement methods?
A Revisions are made as appropriate by the Nuclear Regulation Authority. Revised versions of the Radiation Measurement Methods Series are promptly published on this website.
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QCan the "Radiation Measurement Methods Series" be purchased in book form?
A Please use the electronic version (PDF file), which can be downloaded from this website.
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QHow often do nuclear-powered ships dock at ports?
A The number varies by year, but in the 2023 fiscal year, there were 41 port calls. Depending on social conditions and other factors, the number typically ranges from 40 to 60 port calls annually. For more details, please refer to "Nuclear Powered Warship Departure and Post-departure Survey."
