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The chemical element of atomic number 43, a radioactive metal. Technetium was the first element to be created artificially, in 1937, by bombarding molybdenum with deuterons.
- ‘Some forms of nuclear radiation - such as the beta-emission from radioactive technetium - 99-are particularly difficult to detect underground, partly because the radiation doesn't travel very far.’
- ‘At Sellafield in Cumbria, tests have shown that discharges of the radioactive pollutant technetium pumped into the Irish Sea have spread as far as Scandinavia and have entered the food chain.’
- ‘In sentinel biopsy, radiolabelled technetium is injected into the tumor or surrounding lung, and a gamma camera is used to detect the nodes that the cancer is most likely to spread to first.’
- ‘An isotope of the rare element technetium, denoted Tc, is widely used to form images of the heart, brain, lungs, spleen, and other organs.’
- ‘All forms of the element technetium are radioactive and have relatively short half-lives.’
1940s: modern Latin, from Greek tekhnētos ‘artificial’, from tekhnasthai ‘make by art’, from tekhnē ‘art’.
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