157 Dy
66 91
Half life: 8.14 h 4
Jp: 3/2-
Decay mode: e+b+
Sn (keV): 6969 6
Sp (keV): 6621 7
Prod. mode: Charged particle reaction
Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Mar-1996
Author(s): R.G. Helmer
ENSDF citation: NDS 78,219 (1996)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 1341 6

Gammas from 157Dy (8.14 h 4)

Eg (keV) Ig (%) Decay mode
60.82 7 0.5 3 e+b+
83.01 4 0.62 18 e+b+
143.83 8 0.036 6 e+b+
182.20 20 1.84 18 e+b+
265.34 21 0.19 5 e+b+
297.2 10 0.052 9 e+b+
326.16 20 92 e+b+
405.2 15 0.018 4 e+b+
498.7 15 0.019 5 e+b+
553.1 8 0.020 7 e+b+
576.6 8 0.033 6 e+b+
597.5 6 0.080 14 e+b+
637.1 8 0.018 e+b+
637.1 8 0.02 e+b+
697.6 15 0.0028 14 e+b+
745.2 8 0.052 10 e+b+
770.1 8 0.030 11 e+b+
776.6 8 0.054 11 e+b+
897.0 15 0.0028 18 e+b+
910.4 10 0.0028 e+b+
931.7 8 0.009 3 e+b+
984.0 20 <0.00046 e+b+
992.8 20 0.0037 14 e+b+
1044.4 15 0.006 3 e+b+
1102.3 20 0.0023 11 e+b+
1215.2 8 0.0018 9 e+b+
1276.2 12 0.0046 18 e+b+

X-rays from 157Dy (8.14 h 4)

E (keV) I (%) Assignment
5,547 0.30 3 Tb Ll
6,239 0.78 6 Tb La2
6,273 7.1 5 Tb La1
6,284 0.104 9 Tb Lh
6,940 0.43 7 Tb Lb4
6,977 4.5 4 Tb Lb1
7,097 0.70 11 Tb Lb3
7,116 0.072 5 Tb Lb6
7,367 1.46 11 Tb Lb2
8,105 0.77 7 Tb Lg1
8,398 0.136 23 Tb Lg2
8,423 0.19 3 Tb Lg3
43,288 0.0089 5 Tb Ka3
43,744 26.1 12 Tb Ka2
44,482 46.8 22 Tb Ka1
50,228 4.72 22 Tb Kb3
50,384 9.1 4 Tb Kb1
50,738 0.150 9 Tb Kb5
51,698 3.03 14 Tb Kb2
51,849 1.12 7 Tb Kb4

Betas from 157Dy (8.14 h 4)

>Eb endpoint (keV) Ib (%) Decay mode
64,9 0.006 2 e
238,2 0.13 2 e
244,8 0.045 15 e
296,4 0.007 3 e
348,4 0.013 4 e
643,5 0.025 15 e
703,7 0.05 2 e
743,5 0.07 2 e
1014,88 96 4 e
1197,17 2.1 e
1280,18 5.0 e
1341 5.0 e