Half-Lives and Radiation of Selected Radioisotopes

Isotope	Half-life	Nuclear Radiation Emitted
Radon-222	3.82 days	α
Iodine-131	8.07 days	β
Thorium-234	24.1 days	β, γ
Radium-226	1620 years	α, γ
Carbon-14	5730 years	β
Thorium-230	75,200 years	α, γ
Uranium-235	7.04 X 10⁸ years	α, γ
Potassium-40	1.28 X 10⁹ years	β, γ
Uranium-238	4.47 X1 0⁹ years	α