Word: tritium
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Dates: during 1970-1979
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...weapons for the nation's defense. While radioactive debris has escaped from 68 of 253 underground nuclear tests held in Nevada, AEC officials contend that no leaks have been recorded for tests of more than 200 kilotons. On the other hand, they admit that water contaminated with radioactive tritium could seep through open rock to the Bering Sea and the Pacific Ocean any time within three to 1,000 years. Such uncertainty hardly reassured the concerned environmentalists...
...three researchers confirmed the fact that viral RNA material was indeed producing its own DNA. They labelled four chemical building blocks of DNA with a radioactive isotope of hydrogen called tritium. After mixing the building blocks with viral RNA, the "tracer" element appeared in what was chemically identified as DNA. Thus it was apparent that the RNA had assembled the blocks to form DNA in its own image...