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Definitions of mass number
Definition that contains mass number
  • thorium-228 radioactive isotope of thorium with mass number 228
  • radiothorium radioactive isotope of thorium with mass number 228
  • uranium 235 a uranium isotope with mass number 235; capable of sustaining chain reactions
  • cobalt 60 a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy
  • strontium 90 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
  • boson any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons
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