Astatine
Isotopes

Astatine

Section Title: Isotopes
Table Section Text: None

Alpha decay characteristics for sample astatine isotopes

Mass number	Mass excess	Half-life	Probability of alpha decay	Alpha decay half-life

207	−13.243 MeV	1.80 h	8.6%	20.9 h

208	−12.491 MeV	1.63 h	0.55%	12.3 d

209	−12.880 MeV	5.41 h	4.1%	5.5 d

210	−11.972 MeV	8.1 h	0.175%	193 d

211	−11.647 MeV	7.21 h	41.8%	17.2 h

212	−8.621 MeV	0.31 s	≈100%	0.31 s

213	−6.579 MeV	125 ns	100%	125 ns

214	−3.380 MeV	558 ns	100%	558 ns

219	10.397 MeV	56 s	97%	58 s

220	14.350 MeV	3.71 min	8%	46.4 min

221	16.810 MeV	2.3 min	experimentally alpha stable	∞

Sentence(s)

In astatine, the five isotopes 207 to 211 have half-lives exceeding one hour.

final_sentence: In astatine, the five isotopes 207 to 211 have half-lives exceeding one hour.