172 Er
68 104
Half life: 49.3 h 3
Jp: 0+
Decay mode: b-
Sn (keV): 6836 4
Sp (keV): 9.3E3 6
Prod. mode: Fission product
Thermal neutron activation
Literature cut-off date: 31-May-1995
Author(s): B. Singh
ENSDF citation: NDS 75,199 (1995)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 891 5

Gammas from 172Er (49.3 h 3)

Eg (keV) Ig (%) Decay mode
29.37 5 0.0076 21 b-
38.66 5 0.0072 21 b-
59.692 6 2.69 8 b-
62.524 4 0.206 4 b-
68.107 4 3.29 7 b-
74.940 8 0.118 4 b-
80.19 5 0.0042 21 b-
83.15 25 0.0029 8 b-
89.09 4 0.0046 4 b-
113.71 13 0.0013 8 b-
118.9 2 0.0008 4 b-
127.805 3 2.13 5 b-
134.68 6 0.0101 4 b-
145.83 15 0.0013 8 b-
164.013 5 0.674 25 b-
167.40 7 0.0072 8 b-
177.16 15 0.0010 3 b-
179.6 4 0.0010 4 b-
187.4 4 0.0008 8 b-
202.724 5 1.03 3 b-
206.09 10 0.0029 4 b-
239.5 2 0.0042 8 b-
239.9 2 0.0114 8 b-
295.3 3 0.0025 17 b-
300.19 6 0.0206 8 b-
307.15 10 0.0101 21 b-
344.817 17 0.627 17 b-
370.3 2 0.00122 25 b-
383.501 4 2.35 5 b-
407.338 3 42.1 8 b-
416.8 5 0.009 3 b-
446.025 9 2.96 7 b-
463.7 <0.0021 b-
472.71 4 0.0312 17 b-
475.445 2 1.040 21 b-
479.76 10 0.0114 13 b-
496.3 3 0.0025 13 b-
526.2 4 0.0029 21 b-
535.143 9 0.293 7 b-
547.54 <0.00029 b-
610.062 2 44.2 10 b-
714.45 25 0.0017 13 b-
734.9 <0.00013 b-
797.42 10 0.0105 4 b-
831 ~0.00021 b-
894 ~0.0013 b-

X-rays from 172Er (49.3 h 3)

E (keV) I (%) Assignment
6,341 0.27 3 Tm Ll
7,133 0.67 5 Tm La2
7,180 6.0 5 Tm La1
7,310 0.088 8 Tm Lh
8,026 0.35 5 Tm Lb4
8,102 4.1 4 Tm Lb1
8,176 0.069 5 Tm Lb6
8,231 0.54 8 Tm Lb3
8,468 1.19 10 Tm Lb2
9,437 0.74 7 Tm Lg1
9,730 0.109 18 Tm Lg2
9,779 0.16 3 Tm Lg3
49,274 0.0085 3 Tm Ka3
49,773 17.1 5 Tm Ka2
50,742 30.3 8 Tm Ka1
57,300 3.20 9 Tm Kb3
57,505 6.18 17 Tm Kb1
57,898 0.122 5 Tm Kb5
59,028 2.08 6 Tm Kb2
59,210 0.552 24 Tm Kb4

Betas from 172Er (49.3 h 3)

>Eb endpoint (keV) Ib (%) Decay mode
93,58 0.0117 13 b-
176,5 0.014 3 b-
280,94 46.4 20 b-
355,86 46.4 24 b-
364,77 0.028 18 b-
411,32 0.026 4 b-
415,55 4 b-
483,66 3.3 16 b-
891 7 b-