154m Tb
65 89
Half life: 9.4 h 4
Jp: 3-
Decay mode: e+b+, IT, b-
Ex(keV): 0+v
Sn (keV): 6902 50
Sp (keV): 4550 50
Prod. mode: Charged particle reaction
Literature cut-off date: 1-Mar-1993
Author(s): R.G. Helmer
ENSDF citation: NDS 69,507 (1993)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 78.2 7 3562 50
IT 21.8 7
b- <0.1 246 51

Gammas from 154mTb (9.4 h 4)

Eg (keV) Ig (%) Decay mode
123.071 1 30 4 e+b+
124.371 3 e+b+
232.101 3 0.47 4 e+b+
247.925 6 22.1 20 e+b+
329.920 4 0.196 20 e+b+
337.9 2 0.31 10 e+b+
346.643 5 1.56 20 e+b+
382.025 7 1.04 8 e+b+
415.85 6 2.11 14 e+b+
444.484 6 1.06 6 e+b+
461.61 15 0.254 20 e+b+
484.74 21 0.156 20 e+b+
492.10 24 0.137 20 e+b+
506.44 4 0.61 12 e+b+
518.011 16 6.1 3 e+b+
540.18 6 20 e+b+
546.082 14 0.10 4 e+b+
557.581 7 0.31 6 e+b+
591.763 5 0.12 6 e+b+
598.22 2 1.41 14 e+b+
602.688 9 0.08 4 e+b+
625.257 6 0.23 4 e+b+
642.40 2 0.68 14 e+b+
649.564 11 10.9 6 e+b+
660.35 35 0.12 4 e+b+
669.152 16 0.12 4 e+b+
676.593 6 3.2 3 e+b+
680.652 7 e+b+
692.421 7 3.3 3 e+b+
714.94 5 e+b+
715.817 9 0.57 8 e+b+
722.59 8 0.37 10 e+b+
723.304 5 0.23 8 e+b+
749.4 8 <0.20 e+b+
753.1 9 0.23 12 e+b+
756.763 6 2.66 16 e+b+
796.29 22 0.254 20 e+b+
800.729 15 0.098 20 e+b+
826.29 21 0.137 20 e+b+
830.49 9 0.68 6 e+b+
845.46 2 0.254 20 e+b+
850.64 3 0.16 4 e+b+
857.2 15 0.098 20 e+b+
873.190 5 9.2 6 e+b+
880.634 10 0.31 4 e+b+
892.780 7 3.15 22 e+b+
922.1 9 0.39 12 e+b+
922.1 9 0.51 12 e+b+
924.55 3 1.41 14 e+b+
927.5 4 0.35 12 e+b+
953.18 13 0.57 4 e+b+
964.9 3 0.33 4 e+b+
982.0 4 0.31 6 e+b+
984.3 4 0.45 6 e+b+
996.262 5 8.6 8 e+b+
1004.725 6 10.9 8 e+b+
1012.9 3 0.098 20 e+b+
1020.4 6 0.29 4 e+b+
1033.11 3 0.47 4 e+b+
1041.9 2 0.215 20 e+b+
1047.177 13 0.137 20 e+b+
1053.9 7 0.22 6 e+b+
1058.34 18 0.27 4 e+b+
1061.39 9 0.137 20 e+b+
1072.37 13 0.35 4 e+b+
1084.21 14 0.37 4 e+b+
1084.29 12 0.37 4 e+b+
1102.00 15 0.27 4 e+b+
1105.8 8 0.06 4 e+b+
1118.233 16 0.53 12 e+b+
1123.90 16 e+b+
1128.558 7 1.58 12 e+b+
1140.711 9 1.39 12 e+b+
1149.66 13 0.98 16 e+b+
1152.42 9 2.2 3 e+b+
1177.71 19 0.29 4 e+b+
1188.90 12 0.61 20 e+b+
1208.06 14 0.51 4 e+b+
1214.3 4 0.106 14 e+b+
1229.42 20 0.59 10 e+b+
1233.5 4 0.12 6 e+b+
1237.5 8 0.16 8 e+b+
1241.299 14 0.27 4 e+b+
1246.150 9 0.27 6 e+b+
1258.17 14 1.62 12 e+b+
1265.0 4 0.08 4 e+b+
1274.436 6 0.78 14 e+b+
1274.7 0.31 12 e+b+
1280.8 5 0.18 10 e+b+
1288.39 14 1.39 12 e+b+
1288.39 14 1.39 12 e+b+
1309.05 22 0.117 20 e+b+
1330.8 6 0.059 20 e+b+
1339.53 23 0.29 4 e+b+
1346.0 6 0.039 20 e+b+
1360.3 6 0.039 20 e+b+
1370.2 10 0.08 4 e+b+
1377.6 9 0.06 3 e+b+
1387.76 22 0.293 20 e+b+
1391.2 3 e+b+
1399.7 3 0.059 20 e+b+
1408.2 2 e+b+
1419.4 7 0.72 14 e+b+
1451.2 3 0.137 16 e+b+
1490.37 22 1.04 8 e+b+
1494.048 9 0.27 4 e+b+
1515.8 3 0.31 4 e+b+
1520.69 19 0.57 4 e+b+
1522.8 0.33 16 e+b+
1527.2 4 e+b+
1553.6 6 0.23 4 e+b+
1607 1 e+b+
1618.9 3 0.39 4 e+b+
1651.8 4 0.12 4 e+b+
1673.7 0.45 4 e+b+
1715 1 0.039 20 e+b+
1721 2 0.14 8 e+b+
1814.9 3 0.14 4 e+b+
1858.4 4 0.215 20 e+b+
1887 1 0.039 20 e+b+
1894.5 3 0.166 23 e+b+
1900.72 11 0.07 3 e+b+
1905.0 12 0.156 20 e+b+
1931.0 5 0.117 20 e+b+
1934.71 14 0.72 6 e+b+
1949 1 0.039 20 e+b+
1965.03 7 1.94 14 e+b+
1974.3 e+b+
1997.8 7 0.37 10 e+b+
2014.9 7 0.059 20 e+b+
2024.4 6 0.196 20 e+b+
2035.0 8 0.039 20 e+b+
2054.2 4 0.088 12 e+b+
2084.7 3 0.123 12 e+b+
2101.6 7 0.039 20 e+b+
2106.9 0.156 20 e+b+
2126.3 6 0.039 20 e+b+
2142.9 3 0.215 20 e+b+
2153.81 15 1.00 6 e+b+
2182.6 5 0.18 4 e+b+
2212.92 15 0.82 6 e+b+
2245.7 2 0.45 4 e+b+
2251.8 7 0.08 4 e+b+
2283.0 3 0.215 20 e+b+
2295.9 3 0.313 20 e+b+
2358.3 3 0.196 20 e+b+
2372.4 4 0.131 14 e+b+
2389.5 2 0.196 20 e+b+
2411.1 4 0.10 4 e+b+
2422.6 4 0.029 10 e+b+
2473 1 0.059 20 e+b+
2496.3 8 0.10 4 e+b+
2520.8 10 0.020 10 e+b+
2525.1 7 0.039 20 e+b+
2532.2 3 0.022 10 e+b+
2540 1 0.018 8 e+b+
2546.9 8 0.027 14 e+b+
2553.8 4 0.055 6 e+b+
2559.6 4 0.143 10 e+b+
2575.1 5 0.108 12 e+b+
2630.5 8 0.049 12 e+b+
2634.3 8 0.049 12 e+b+
2643 1 0.08 4 e+b+
2652 1 0.08 4 e+b+
2656.0 2 e+b+
2683.4 5 0.063 6 e+b+
2811.3 10 e+b+
2839.2 15 0.020 6 e+b+
2921.4 15 0.0039 20 e+b+
2934.1 6 0.022 6 e+b+
2942.2 10 0.027 10 e+b+
3240.4 15 0.018 6 e+b+
3260.0 15 0.018 10 e+b+

X-rays from 154mTb (9.4 h 4)

E (keV) I (%) Assignment
5,362 0.22 3 Gd Ll
6,026 0.58 5 Gd La2
6,050 0.085 9 Gd Lh
6,058 5.2 5 Gd La1
6,687 0.25 4 Gd Lb4
6,713 3.6 4 Gd Lb1
6,832 0.41 7 Gd Lb3
6,867 0.052 5 Gd Lb6
7,102 1.09 10 Gd Lb2
7,243 0.0089 8 Gd Lb5
7,790 0.61 6 Gd Lg1
7,930 0.0051 7 Gd Lg6
8,087 0.080 13 Gd Lg2
8,105 0.112 19 Gd Lg3
41,864 0.0055 3 Gd Ka3
42,309 17.8 10 Gd Ka2
42,996 32.1 18 Gd Ka1
48,551 3.18 18 Gd Kb3
48,695 6.2 4 Gd Kb1
49,038 0.097 7 Gd Kb5
49,959 2.06 12 Gd Kb2
50,099 0.80 5 Gd Kb4

Betas from 154mTb (9.4 h 4)

>Eb endpoint (keV) Ib (%) Decay mode
1143,79 4.7 11 e
1223,97 6.3 13 e
1254,36 4.4 10 e
1282,9 3.0 7 e
1373,98 23 5 e
2432,21 2.0 13 e
2563,74 4.7 20 e
3189 7 4 e
3436,93 9 12 e