169 Er
68 101
Half life: 9.40 d 2
Jp: 1/2-
Decay mode: b-
Sn (keV): 6003.1 3
Sp (keV): 8135 29
Prod. mode: Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Mar-1990
Author(s): V.S. Shirley
ENSDF citation: NDS 64,505 (1991)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 351.1 11

Gammas from 169Er (9.40 d 2)

Eg (keV) Ig (%) Decay mode
8.41031 19 0.158 18 b-
109.77987 6 0.0013 3 b-
118.19018 18 0.00014 4 b-

X-rays from 169Er (9.40 d 2)

E (keV) I (%) Assignment
6,341 1.1E-05 3 Tm Ll
7,133 2.8E-05 6 Tm La2
7,180 2.5E-04 6 Tm La1
7,310 3.6E-06 8 Tm Lh
8,026 1.4E-05 4 Tm Lb4
8,102 1.7E-04 4 Tm Lb1
8,176 2.8E-06 7 Tm Lb6
8,231 2.2E-05 6 Tm Lb3
8,468 4.9E-05 11 Tm Lb2
9,437 3.1E-05 7 Tm Lg1
9,730 4.5E-06 12 Tm Lg2
9,779 6.5E-06 18 Tm Lg3
49,274 3.7E-07 8 Tm Ka3
49,773 0.00074 17 Tm Ka2
50,742 0.0013 3 Tm Ka1
57,300 1.4E-04 3 Tm Kb3
57,505 0.00027 6 Tm Kb1
57,898 5.3E-06 12 Tm Kb5
59,028 9.0E-05 20 Tm Kb2
59,210 2.4E-05 5 Tm Kb4

Betas from 169Er (9.40 d 2)

>Eb endpoint (keV) Ib (%) Decay mode
232,91 0.0048 10 b-
342,69 45 5 b-
351,1 55 5 b-