Iron/Isotopes

Relative potencies of the corticosteroids

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+)
Adapted from Cancer Medicine and US Pharmacist

⁵³Fe 8.51 m 7/2-

⁵³m1Fe 2.58 m 19/2-

⁵⁴Fe stable 0+ %Abundance=5.8 1

⁵⁵Fe 2.73 y 3/2-

⁵⁶Fe stable 0+ %Abundance=91.72 30

⁵⁷Fe stable 1/2- %Abundance=2.2 1

⁵⁸Fe stable 0+ %Abundance=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 170 ms (1/2-)

⁷⁰Fe --- 0+

⁷¹Fe --- (7/2+)

⁷²Fe ---0+