139 Sm
62 77
Half life: 2.57 m 10
Jp: (1/2)+
Decay mode: e+b+
Sn (keV): 9.2E3 sy
Sp (keV): 4.6E3 sy
Literature cut-off date: 17-Apr-1989
Author(s): T.W. Burrows
ENSDF citation: NDS 57,337 (1989)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 5163 60

Gammas from 139Sm (2.57 m 10)

Eg (keV) Ig (%) Decay mode
33.0 1 e+b+
188.9 1 2.70 15 e+b+
228.0 2 2.99 18 e+b+
234.6 3 1.1 4 e+b+
273.7 2 37 e+b+
306.7 2 28.5 18 e+b+
315.7 2 1.39 22 e+b+
319.2 3 0.62 18 e+b+
322.6 3 0.91 18 e+b+
329.5 4 0.18 7 e+b+
333.4 4 0.44 15 e+b+
361.5 3 0.51 15 e+b+
368.4 3 0.29 11 e+b+
381.4 4 0.11 4 e+b+
419.7 3 0.40 11 e+b+
427.5 4 0.18 7 e+b+
447.5 2 3.21 18 e+b+
463.1 3 0.58 15 e+b+
467.0 3 0.55 15 e+b+
475.3 2 2.5 3 e+b+
508.5 3 4.7 11 e+b+
554.2 3 0.73 15 e+b+
578.9 4 0.22 7 e+b+
582.0 3 0.33 7 e+b+
587.3 4 0.11 4 e+b+
588.4 4 0.07 4 e+b+
589.5 2 1.90 22 e+b+
596.3 2 8.0 7 e+b+
611.7 3 0.29 11 e+b+
619.2 3 0.66 15 e+b+
622.9 4 0.18 7 e+b+
648.8 3 0.55 15 e+b+
652.2 3 0.47 15 e+b+
655.3 2 3.6 6 e+b+
655.8 2 2.9 4 e+b+
679.3 4 0.18 7 e+b+
709.0 4 0.22 7 e+b+
720.4 4 0.11 4 e+b+
720.7 4 0.18 7 e+b+
741.4 4 0.11 4 e+b+
741.9 3 2.7 4 e+b+
744.8 3 0.66 11 e+b+
770.0 3 0.36 7 e+b+
782.0 1 6.9 11 e+b+
837.6 4 0.15 4 e+b+
853.1 3 0.084 18 e+b+
862.2 2 1.93 22 e+b+
877.2 3 0.36 7 e+b+
886.0 5 0.73 15 e+b+
910.1 2 1.8 3 e+b+
930.1 3 0.91 15 e+b+
933.6 4 0.44 11 e+b+
1015.7 2 1.6 3 e+b+
1126.9 3 0.40 11 e+b+
1135.2 2 0.80 15 e+b+
1138.2 4 0.29 15 e+b+
1156.7 4 0.29 11 e+b+
1168.1 3 0.69 11 e+b+
1188.0 3 0.47 11 e+b+
1220.2 3 0.26 7 e+b+
1228.3 4 0.11 4 e+b+
1274.1 3 0.22 7 e+b+
1322.1 3 0.44 11 e+b+
1322.3 4 0.11 4 e+b+
1359.7 3 0.26 7 e+b+
1392.2 5 0.040 15 e+b+
1392.6 4 0.66 15 e+b+
1441.9 3 0.51 15 e+b+
1446.2 4 0.18 7 e+b+
1675.2 3 1.31 22 e+b+
1768.0 4 0.33 11 e+b+
1770.0 3 0.40 11 e+b+
1800.7 5 0.077 18 e+b+
1903.2 3 0.44 11 e+b+
1936.6 5 0.33 11 e+b+
1982.0 5 0.18 7 e+b+
2210.0 3 1.57 22 e+b+
2929.0 10 0.15 7 e+b+
2962.4 3 0.62 15 e+b+

X-rays from 139Sm (2.57 m 10)

E (keV) I (%) Assignment
4,809 0.074 8 Pm Ll
5,363 0.0294 24 Pm Lh
5,408 0.198 14 Pm La2
5,432 1.79 13 Pm La1
5,957 0.18 3 Pm Lb4
5,961 1.16 10 Pm Lb1
6,071 0.30 5 Pm Lb3
6,128 0.0161 11 Pm Lb6
6,339 0.38 3 Pm Lb2
6,892 0.190 16 Pm Lg1
7,186 0.054 10 Pm Lg2
7,186 0.077 14 Pm Lg3
37,756 0.00159 6 Pm Ka3
38,171 7.31 22 Pm Ka2
38,725 13.3 4 Pm Ka1
43,713 1.29 4 Pm Kb3
43,827 2.49 7 Pm Kb1
44,145 0.0358 16 Pm Kb5
44,942 0.819 24 Pm Kb2
45,064 0.309 14 Pm Kb4

Betas from 139Sm (2.57 m 10)

>Eb endpoint (keV) Ib (%) Decay mode
901,9 0.06 4 b+
1923,9 0.71 16 e
1927,99 1.0 2 b+
2063,4 0.18 6 b+
2094,3 0.23 6 b+
2156,2 0.63 13 b+
2418,1 0.10 5 b+
2471,6 0.51 11 b+
2542,2 0.26 7 b+
2611,35 0.70 12 b+
2635,9 0.20 5 b+
2674,9 0.25 8 b+
2676,41 0.41 9 b+
2696,13 1.31 18 b+
2771,7 0.42 12 b+
2930,6 0.74 12 b+
2949,99 1.5 3 e
2954,24 1.6 2 b+
3011,13 0.34 8 b+
3026,6 0.48 11 b+
3085,4 0.23 8 e
3116,3 0.28 8 e
3122,25 3.5 4 b+
3178,2 0.72 15 e
3208,41 3.0 4 b+
3212,15 1.4 3 b+
3252,41 0.91 15 b+
3275,81 1.48 18 b+
3282,3 0.24 6 b+
3355,97 11.5 14 b+
3416,64 2.24 19 b+
3440,1 0.08 4 e
3482,7 3.0 5 b+
3493,6 0.40 9 e
3541,69 5.3 8 b+
3548,52 2.9 4 b+
3564,2 0.18 5 e
3633,35 0.46 9 e
3657,9 0.13 4 e
3675,34 1.1 5 b+
3696,9 0.15 5 e
3698,41 0.25 6 e
3718,13 0.81 13 e
3793,7 0.24 7 e
3831,31 23.7 16 b+
3864,27 4.1 14 b+
3952,6 0.36 7 e
3976,24 0.8 2 e
4033,13 0.15 4 e
4048,6 0.21 6 e
4144,25 1.4 2 e
4230,41 1.1 2 e
4234,15 0.5 1 e
4274,41 0.33 7 e
4297,81 0.53 9 e
4304,3 0.09 3 e
4377,97 3.9 6 e
4438,64 0.72 9 e
4504,7 0.9 2 e
4563,69 1.6 3 e
4570,52 0.9 2 e
4697,34 0.3 2 e
4853,31 5.6 7 e
4886,27 0.9 4 e