Table 1.

Decay chain for radium-223 (²²³Ra). The relative proportions of the branched decay from bismuth-211 (²¹¹Bi) are 0.997 and 0.003 for ²¹¹Bi → thallium-207 (²⁰⁷Tl) and ²¹¹Bi → polonium-211 (²¹¹Po), respectively

Radionuclide	Mode of decay	Abundance	Half-life
223Ra → 219Rn	α	100%	11.43 days
219Rn → 215Po	α	100%	3.96 s
215Po → 211Pb	α	100%	1.78 ms
211Pb → 211Bi	β-	100%	36.1 min
211Bi → 211Po	β-	0.276%	2.14 min
211Bi → 207Tl	α	99.72%	2.14 min
211Po → 207Pb	α	100%	0.516 s
207Tl → 207Pb	β-	100%	4.77 min
207Pb → –	Stable	–	–

²⁰⁷Pb, lead-207; ²¹¹Pb, lead-211; ²¹⁹Rn, radon-219.