Word: yttrium
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Dates: during 1950-1959
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...give bigger radiation doses more safely to hard-to-reach parts of the body. Examples: cobalt-60 "bombs," a new cesium-137 unit at M. D. Anderson Hospital, higher-powered X-ray machines and linear-particle accelerators, ingeniously refined ways of implanting radioisotopes such as iridium 192 and yttrium 90 in tumors...