Iron/Isotopes

Isotopes of Iron and Their Properties

Isotope	Half-life	Spin	Abundance (%)
45Fe
46Fe	20 ms	0+
47Fe	27 ms
48Fe	44 ms	0+
49Fe	70 ms	(7/2-)
50Fe	150 ms	0+
51Fe	305 ms	5/2-
52Fe	8.275 h	0+
52m1Fe	45.9 s	(12+)
53Fe	8.51 m	7/2-
53m1Fe	2.58 m	19/2-
54Fe	stable	0+	5.8 1
55Fe	2.73 y	3/2-
56Fe	stable	0+	91.72 30
57Fe	stable	1/2-	2.2 1
58Fe	stable	0+	0.28 1
59Fe	44.503 d	3/2-
60Fe	1.5e+6 y	0+
61Fe	5.98 m	3/2-,5/2-
62Fe	68 s	0+
63Fe	6.1 s	(5/2)-
64Fe	2.0 s	0+
65Fe	0.4 s
66Fe	440 ms	0+
67Fe	470 ms	(1/2-)
68Fe	0.10 s	0+
69Fe		(1/2-)
70Fe		0+
71Fe		(7/2+)
72Fe		0+

Adapted from The Berkeley Laboratory Isotopes Project (http://ie.lbl.gov/education/parent/Fe_iso.htm)