144m Tb
65 79
Half life: 4.25 s 15
Jp: (6-)
Decay mode: IT, e+b+
Ex(keV): 396.9
Sn (keV): 1.01E4 sy
Sp (keV): 1.9E3 sy
E(level): 396.9 keV
Literature cut-off date: 1-Nov-1988
Author(s): J.K. Tuli
ENSDF citation: NDS 56,607 (1989)

Decay properties

Mode Branching (%) Q-value (keV)
IT 66
e+b+ 34 9.1E3 sy

Gammas from 144mTb (4.25 s 15)

Eg (keV) Ig (%) Decay mode
113.0 2.8 IT
139.7 1.7 e+b+
169.1 8 e+b+
283.9 66 IT
315.0 6 e+b+
470.2 1.0 e+b+
485.3 2.4 e+b+
558.0 14 e+b+
573.5 1.0 e+b+
600.3 11 e+b+
609.7 1.0 e+b+
628.0 2.1 e+b+
697.9 3.9 e+b+
712.8 2.5 e+b+
743.0 34 e+b+
959.36 14 e+b+
1001.6 20 e+b+
1117.4 0.31 e+b+

X-rays from 144mTb (4.25 s 15)

E (keV) I (%) Assignment
5,362 0.0121 19 Gd Ll
5,547 0.155 22 Tb Ll
6,026 0.032 4 Gd La2
6,050 0.0048 6 Gd Lh
6,058 0.29 4 Gd La1
6,239 0.41 5 Tb La2
6,273 3.7 4 Tb La1
6,284 0.087 9 Tb Lh
6,687 0.012 3 Gd Lb4
6,713 0.20 3 Gd Lb1
6,832 0.020 4 Gd Lb3
6,867 0.0028 4 Gd Lb6
6,940 0.045 14 Tb Lb4
6,977 3.8 4 Tb Lb1
7,097 0.074 22 Tb Lb3
7,102 0.060 8 Gd Lb2
7,116 0.037 4 Tb Lb6
7,243 0.00049 7 Gd Lb5
7,367 0.76 9 Tb Lb2
7,790 0.034 5 Gd Lg1
7,930 0.00028 4 Gd Lg6
8,087 0.0039 9 Gd Lg2
8,105 0.0055 12 Gd Lg3
8,105 0.65 7 Tb Lg1
8,398 0.014 4 Tb Lg2
8,423 0.020 6 Tb Lg3
41,864 0.00030 4 Gd Ka3
42,309 0.98 13 Gd Ka2
42,996 1.76 24 Gd Ka1
43,288 0.0012 3 Tb Ka3
43,744 3.4 8 Tb Ka2
44,482 6.1 14 Tb Ka1
48,551 0.175 24 Gd Kb3
48,695 0.34 5 Gd Kb1
49,038 0.0053 7 Gd Kb5
49,959 0.113 15 Gd Kb2
50,099 0.044 6 Gd Kb4
50,228 0.62 14 Tb Kb3
50,384 1.2 3 Tb Kb1
50,738 0.020 5 Tb Kb5
51,698 0.40 9 Tb Kb2
51,849 0.15 3 Tb Kb4

Betas from 144mTb (4.25 s 15)

>Eb endpoint (keV) Ib (%) Decay mode
6480 3.5 e
6584,2 1.0 e
6634,9 0.30 e
6708,9 2.4 e
6709,9 6 e
7025 2.7 e
7054,4 4.9 e
7142,6 1.0 e
7194,2 8 e