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- | caption = Yanosuke Otsuka in {{Circa|1940}} | birth_place = [[Tokyo]], [[Empire of Japan|Japan]] ...7 KB (842 words) - 00:14, 28 October 2024
- ...[https://books.google.com/books?id=whc4AAAAMAAJ&pg=PT5 digitized version] in [[Google Books]].</ref>]] ...radiation]], radioactive substances such as [[radon]] and [[radium]] found in the environment, and the potential health hazards of non-ionizing radiation ...263 KB (37,147 words) - 20:45, 27 January 2025