155 Sm
62 93
Half life: 22.3 m 2
Jp: 3/2-
Decay mode: b-
Sn (keV): 5807.2 3
Sp (keV): 9069 74
Prod. mode: Fission product
Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Mar-1994
Author(s): C.W. Reich
ENSDF citation: NDS 71,709 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 1626.9 12

Gammas from 155Sm (22.3 m 2)

Eg (keV) Ig (%) Decay mode
25.64 6 0.52 8 b-
30.5 5 0.56 4 b-
53.1 4 0.015 6 b-
61.6069 3 0.224 22 b-
63.1 5 0.011 4 b-
64.6761 6 0.0075 15 b-
78.6379 10 0.254 11 b-
80.0 5 0.032 8 b-
84.1017 10 0.0023 6 b-
90.3725 17 0.0093 22 b-
104.3346 8 74.6 19 b-
138.3746 5 0.075 19 b-
141.4428 6 1.98 8 b-
167.1482 11 0.037 8 b-
169.0067 9 0.037 11 b-
178.572 7 0.0019 4 b-
183.4 5 0.0019 4 b-
195.624 6 0.0086 19 b-
203.048 3 0.037 4 b-
220.1 6 0.0021 5 b-
228.7346 18 0.052 8 b-
229.943 5 0.0030 8 b-
245.771 4 3.7 b-
280 1 0.015 4 b-
287.146 4 0.0011 4 b-
307.384 9 0.010 3 b-
426.177 3 0.0127 22 b-
461.046 11 0.065 9 b-
510.296 3 0.0123 15 b-
522.670 4 0.149 15 b-
571.885 4 0.019 4 b-
603.806 9 0.011 4 b-
631.023 4 0.017 5 b-
648.56 6 0.0075 19 b-
664.122 7 0.060 8 b-
665.423 5 0.0056 15 b-
677.406 6 0.0067 19 b-
713.31 5 0.0060 15 b-
758.0 15 0.0034 19 b-
768.27 7 0.0056 11 b-
817.61 4 0.00093 19 b-
830 20 0.00093 19 b-
861.1 0.0048 11 b-
880 10 0.0028 6 b-
911 0.00093 19 b-
923.08 3 0.00093 19 b-
932.624 16 0.0093 19 b-
997.355 25 0.012 3 b-
1002.38 5 0.0168 22 b-
1018 0.00093 19 b-
1055 ~0.0009 b-
1096.17 6 0.00093 19 b-
1132 0.0019 4 b-
1159.52 10 0.013 3 b-
1174.5 15 0.0015 4 b-
1197.7 4 0.0056 11 b-
1207.8 10 0.0015 4 b-
1223.02 9 0.0224 22 b-
1262.4 5 0.0022 8 b-
1301.56 5 0.078 8 b-

X-rays from 155Sm (22.3 m 2)

E (keV) I (%) Assignment
5,177 0.059 8 Eu Ll
5,816 0.157 16 Eu La2
5,817 0.022 3 Eu Lh
5,846 1.42 15 Eu La1
6,438 0.11 4 Eu Lb4
6,457 0.92 11 Eu Lb1
6,571 0.18 7 Eu Lb3
6,617 0.0136 14 Eu Lb6
6,844 0.30 3 Eu Lb2
7,484 0.155 19 Eu Lg1
7,768 0.034 14 Eu Lg2
7,795 0.049 20 Eu Lg3
40,467 0.00138 5 Eu Ka3
40,902 5.09 16 Eu Ka2
41,542 9.2 3 Eu Ka1
46,905 0.90 3 Eu Kb3
47,038 1.74 5 Eu Kb1
47,373 0.0266 12 Eu Kb5
48,249 0.577 18 Eu Kb2
48,386 0.230 11 Eu Kb4

Betas from 155Sm (22.3 m 2)

>Eb endpoint (keV) Ib (%) Decay mode
325,32 0.109 8 b-
362,86 0.016 3 b-
520,12 0.030 4 b-
525,24 0.023 4 b-
530,73 0.0030 6 b-
703,72 0.0039 20 b-
715,69 0.010 5 b-
750,1 0.015 5 b-
809,23 0.058 6 b-
858,45 0.28 2 b-
1319,52 2.17 22 b-
1381,12 4.27 24 b-
1522,57 92.8 24 b-
1626,9 1.0 b-