149 Er
68 81
Half life: 4 s 2
Jp: (1/2+)
Decay mode: e+b+, ep
Sn (keV): 1.02E4 sy
Sp (keV): 2.7E3 sy
Literature cut-off date: 1-Dec-1994
Author(s): B. Singh
ENSDF citation: NDS 73,351 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 7.8E3 sy
ep 7 2

Gammas from 149Er (4 s 2)

Eg (keV) Ig (%) Decay mode
171.5 1 14 6 e+b+
343.9 1 ~4 e+b+
1233.0 10 ~4 e+b+
1577.9 3 20 6 e+b+
1748.4 1 72 8 e+b+

X-rays from 149Er (4 s 2)

E (keV) I (%) Assignment
5,943 9.7 10 Ho Ll
6,680 25.1 16 Ho La2
6,720 226 14 Ho La1
6,790 3.24 24 Ho Lh
7,471 13.9 21 Ho Lb4
7,526 147 11 Ho Lb1
7,635 2.44 15 Ho Lb6
7,653 22 3 Ho Lb3
7,910 46 3 Ho Lb2
8,757 25.8 20 Ho Lg1
9,051 4.4 7 Ho Lg2
9,088 6.3 10 Ho Lg3
46,223 0.313 12 Ho Ka3
46,700 763 22 Ho Ka2
47,547 1357 40 Ho Ka1
53,695 140 4 Ho Kb3
53,876 271 8 Ho Kb1
54,246 4.93 22 Ho Kb5
55,293 91 3 Ho Kb2
55,457 28.4 13 Ho Kb4

Betas from 149Er (4 s 2)

>Eb endpoint (keV) Ib (%) Decay mode
800 6 e
1758 0.07 b+
1828 0.050 b+
2328 0.02 b+
2568 0.08 b+
2780 0.38 e
2818 0.07 b+
2850 0.23 e
3028 0.10 b+
3350 0.06 e
3590 0.14 e
3840 0.09 e
4050 0.10 e
4980,6 76 b+
6002,6 17 e