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