unstable
hot
half-life
calcium-45
nonradioactive
nuclear disintegration
nuclear decay
radioactive disintegration
beta radiation
disintegration
iodine-125
radioactive
calcium-48
radioactively
radioactive material
radiodecay
krypton-85
nitrogen-13
beta ray
electron radiation
active material
radioactivating
sulfur-35
radioisotope
radioiodine
alpha radiation
potassium-43
Geiger-Nuttall law
iodine-131
predecay
radioactinium
potassium-40
radiocarbon
carbon 14
radiation
polonium-210
radio-
anisotomic
activate
potassium-42
Ci
alpha ray
curie
radiotungsten
hassium-270
radioactivate
radiocontamination
decay constant
autoradiolysis
radiohydrogen