Z A E Element Half-life Origin 22 44 67.9 Ti 63 y 22 44 78.3 Ti 63 y 19 43 220.0 K 22.3 h 28 56 270.0 Ni 6.1 d 24 51 320.0 Cr 27.7 d 4 7 478.0 Be 53.1 d 1 0 511.0 e+ 28 56 750.0 Ni 6.1 d 28 56 812.0 Ni 6.1 d 27 56 847.0 Co 77.3 d 23 48 984.0 V 16.0 d 26 59 1099.0 Fe 44.5 d 27 56 1238.0 Co 77.3 d 11 22 1274.0 Na 2.60 y 28 57 1378.0 Ni 35.6 d 25 52 1434.0 Mn 5.6 d 13 26 1809.0 Al 1.06**6 y 27 56 2599.0 Co 77.3 d