156 Pm
61 95
Half life: 26.70 s 10
Jp: 4(-)
Decay mode: b-
Sn (keV): 5311 47
Sp (keV): 8.75E3 16
Literature cut-off date: 1-May-1991
Author(s): R.G. Helmer
ENSDF citation: NDS 65,65 (1992)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 5155 35

Gammas from 156Pm (26.70 s 10)

Eg (keV) Ig (%) Decay mode
75.88 5 12.5 7 b-
117.42 5 13.8 7 b-
173.75 5 52.0 20 b-
223.31 10 1.0 1 b-
267.32 5 13.3 7 b-
370.94 10 0.6 1 b-
376.75 10 0.9 1 b-
380.4 4 0.6 1 b-
494.4 4 0.3 1 b-
503.37 20 0.3 1 b-
518.4 4 0.9 1 b-
524.9 4 1.0 1 b-
625.27 20 0.6 1 b-
626.37 20 0.6 1 b-
684.65 10 2.1 1 b-
690.90 10 5.6 3 b-
727.6 3 0.9 2 b-
750.26 10 2.1 2 b-
756.51 10 2.1 2 b-
770.77 10 2.6 3 b-
799.70 10 3.6 4 b-
803.9 3 1.1 2 b-
827.03 10 0.6 1 b-
832.08 20 1.2 2 b-
860.26 20 1.1 1 b-
880.39 10 10.4 5 b-
894.35 10 8.4 4 b-
934.00 10 12.3 6 b-
992.0 10 0.3 1 b-
1034.25 10 1.4 1 b-
1147.84 10 20.5 1 b-
1259.44 10 12.6 6 b-
1360.58 10 1.8 2 b-
1374.91 10 2.3 2 b-
1382.24 10 5.7 3 b-
1416.6 5 0.6 1 b-
1433.70 10 8.4 4 b-
1473.6 4 0.5 1 b-
1509.12 20 2.8 3 b-
1516.56 10 7.4 4 b-
1555.6 5 0.4 1 b-
2269.9 4 0.7 1 b-
2276.18 20 0.7 1 b-
2360.0 3 1.0 1 b-
2366.78 20 0.8 1 b-
2406.7 3 1.0 1 b-
2443.34 20 2.4 2 b-
2450.17 10 2.7 3 b-

X-rays from 156Pm (26.70 s 10)

E (keV) I (%) Assignment
4,993 0.24 3 Sm Ll
5,589 0.108 9 Sm Lh
5,610 0.65 5 Sm La2
5,636 5.9 5 Sm La1
6,196 0.158 24 Sm Lb4
6,206 4.4 4 Sm Lb1
6,317 0.26 4 Sm Lb3
6,371 0.055 4 Sm Lb6
6,587 1.24 10 Sm Lb2
7,183 0.73 6 Sm Lg1
7,471 0.049 8 Sm Lg2
7,489 0.069 11 Sm Lg3
39,097 0.00376 17 Sm Ka3
39,522 14.8 6 Sm Ka2
40,118 26.8 10 Sm Ka1
45,294 2.62 10 Sm Kb3
45,414 5.08 20 Sm Kb1
45,741 0.075 4 Sm Kb5
46,578 1.68 7 Sm Kb2
46,705 0.63 3 Sm Kb4

Betas from 156Pm (26.70 s 10)

>Eb endpoint (keV) Ib (%) Decay mode
2460,3 0.8 b-
2543,49 0.8 4 b-
2550,3 1.0 4 b-
2633,78 16.5 6 b-
2640,96 8.2 5 b-
2677,4 1.0 4 b-
2818,08 1.8 4 b-
2894,48 4.2 4 b-
2960,09 7.7 4 b-
3126,2 1.9 4 b-
3421,65 1.0 4 b-
3549,7 1.8 4 b-
3644,96 23.0 15 b-
3650,78 11.4 9 b-
3762,45 3.1 16 b-
3903,9 0.6 4 b-
4049,89 2.5 4 b-
4139,38 1.7 4 b-
4284,31 3.6 5 b-
4642,93 3.4 10 b-