"0"^^ . . "strontium 90"@en-us . "113817048"@en-us . . "a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones"@en-us . . . "0"^^ . . . . . "114656001"^^ . "strontium 90"^^ . "14656001-n"^^ . .