radioactivities
Unstable atom behaviors
Radioactivities is the plural of radioactivity—the emission of particles and energy from unstable atomic nuclei.
The plural appears when discussing multiple types or instances: The radioactivities of different isotopes vary widely.
Scientists measure radioactivities when comparing decay rates across samples or elements.
Gradual organic breakdown
- isotopesAtomic number twins
- half-lifePeriod for fifty-percent reduction
- alpha particlesEmitted helium nuclei
- beta particlesElectrons from radioactive decay
gamma rays · neutrons · positrons · nuclei · transmutation · fission · fusion · ionization
Introduction of impurities
- falloutPost-blast atmospheric particles
- exposureState of being unprotected
- meltdownCatastrophic loss of control
- ChernobylSoviet nuclear disaster site
Fukushima · Three Mile Island · evacuation · Geiger counter · protective gear · shielding · dosimeter · decontamination
Element ninety-two
- plutoniumActinide, atomic number 94
- reactorControlled fission apparatus
- fissionNuclear breakup releasing energy
- power plantFacility producing electrical energy
electricity · chain reaction · coolant · turbine · nuclear fuel · control rods · enrichment · breeder reactor
Healthcare using radioactive materials
- tracerPath-marking projectile
- PET scanRadiotracer-based internal imaging
- radiopharmaceuticalsMedicinal radioactive substances
- brachytherapyLocalized implanted radiation oncology
oncology · tumor · imaging · iodine-131 · technetium-99m · radioisotope · diagnostic · therapeutic
Radioactive isotope for dating
- uranium-238Predominant uranium isotope
- potassium-40Naturally radioactive potassium isotope
- radiometricMeasuring by radiation
- archaeologyStudy of physical remnants
paleontology · fossils · geology · chronology · sediments · stratigraphy · geochronology · decay rate
decay
Gradual organic breakdown
- isotopesAtomic number twins
- half-lifePeriod for fifty-percent reduction
- alpha particlesEmitted helium nuclei
beta particles · gamma rays · neutrons · positrons · nuclei · transmutation · fission · fusion · ionization · spectroscopy
contamination
Introduction of impurities
- falloutPost-blast atmospheric particles
- exposureState of being unprotected
- meltdownCatastrophic loss of control
Chernobyl · Fukushima · Three Mile Island · evacuation · Geiger counter · protective gear · shielding · dosimeter · decontamination · exclusion zone
uranium
Element ninety-two
- plutoniumActinide, atomic number 94
- reactorControlled fission apparatus
- fissionNuclear breakup releasing energy
power plant · electricity · chain reaction · coolant · turbine · nuclear fuel · control rods · enrichment · breeder reactor · steam generator
nuclear medicine
Healthcare using radioactive materials
- tracerPath-marking projectile
- PET scanRadiotracer-based internal imaging
- radiopharmaceuticalsMedicinal radioactive substances
brachytherapy · oncology · tumor · imaging · iodine-131 · technetium-99m · radioisotope · diagnostic · therapeutic · cancer treatment
carbon-14
Radioactive isotope for dating
- uranium-238Predominant uranium isotope
- potassium-40Naturally radioactive potassium isotope
- radiometricMeasuring by radiation
archaeology · paleontology · fossils · geology · chronology · sediments · stratigraphy · geochronology · decay rate · rock samples
radioactivitiesstability
Resistance to displacement
inertness · permanence · stasis · inactivity · equilibrium
radioactivitieschemical reactions
Processes changing substance composition
molecular bonding · chemical processes · covalent bonding · photosynthesis · metabolism
radiant, radiate, radiance, radiation, radiator, radial, radium, radioactive, radon