161 Tb
65 96
Half life: 6.88 d 3
Jp: 3/2+
Decay mode: b-
Sn (keV): 7696.6 6
Sp (keV): 6808.6 10
Prod. mode: Fission product
Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Jul-1988
Author(s): R.G. Helmer
ENSDF citation: NDS 59,1 (1990)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 593.1 14

Gammas from 161Tb (6.88 d 3)

Eg (keV) Ig (%) Decay mode
18.15 5 b-
25.65150 7 23.2 10 b-
28.701 12 0.0365 22 b-
43.821 1 0.060 6 b-
48.91562 14 17.0 4 b-
56.64 3 b-
57.196 1 1.79 5 b-
59.235 2 0.0222 21 b-
74.56711 22 10.2 2 b-
77.414 1 0.0597 20 b-
81.196 1 0.00224 24 b-
84.86 5 0.00042 15 b-
87.942 1 0.183 4 b-
100.413 9 0.00010 5 b-
103.062 1 0.101 4 b-
106.108 1 0.0778 24 b-
109.83 4 b-
112.549 2 0.00011 5 b-
131.8 1 ~0.00010 b-
138.385 2 0.00080 12 b-
187.3 2 b-
212.80 15 0.000039 18 b-
238.481 2 0.00226 12 b-
286.476 2 0.0143 5 b-
292.409 1 0.058 3 b-
315.175 3 0.00055 12 b-
319.673 1 0.00330 24 b-
341.320 2 0.0035 3 b-
343.664 2 0.0133 10 b-
348.371 3 0.00057 8 b-
376.869 5 0.00061 6 b-
392.63 4 0.00210 13 b-
418.494 3 0.0081 4 b-
425.784 4 0.00030 5 b-
475.687 2 0.0182 12 b-
506.68 16 0.00085 6 b-
550.251 3 0.0362 18 b-

X-rays from 161Tb (6.88 d 3)

E (keV) I (%) Assignment
5,743 0.29 3 Dy Ll
6,458 0.75 6 Dy La2
6,495 6.8 6 Dy La1
6,534 0.115 9 Dy Lh
7,204 1.51 23 Dy Lb4
7,248 5.1 4 Dy Lb1
7,370 2.4 4 Dy Lb3
7,374 0.071 6 Dy Lb6
7,636 1.39 12 Dy Lb2
8,426 0.89 7 Dy Lg1
8,714 0.48 8 Dy Lg2
8,753 0.69 11 Dy Lg3
44,743 0.00246 9 Dy Ka3
45,208 6.57 20 Dy Ka2
45,998 11.7 4 Dy Ka1
51,947 1.20 4 Dy Kb3
52,113 2.32 7 Dy Kb1
52,475 0.0401 18 Dy Kb5
53,476 0.776 23 Dy Kb2
53,634 0.268 12 Dy Kb4

Betas from 161Tb (6.88 d 3)

>Eb endpoint (keV) Ib (%) Decay mode
42,85 0.066 8 b-
141,67 0.008 b-
174,87 0.035 b-
226,12 0.070 9 b-
380,15 0.012 b-
461,34 26 2 b-
518,53 66 4 b-
567,45 10 b-
593,1 10 b-