149 Pm
61 88
Half life: 53.08 h 5
Jp: 7/2+
Decay mode: b-
Sn (keV): 7269 7
Sp (keV): 5947 4
Prod. mode: Fission product
Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Dec-1994
Author(s): B. Singh
ENSDF citation: NDS 73,351 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 1071 4

Gammas from 149Pm (53.08 h 5)

Eg (keV) Ig (%) Decay mode
22.510 8 <0.050 b-
72.983 10 0.000031 25 b-
208.283 21 0.00146 9 b-
238.38 12 0.00022 3 b-
242.10 14 0.00019 3 b-
254.566 23 0.0053 3 b-
257.77 11 0.00034 3 b-
263.23 4 0.0096 3 b-
277.089 10 0.0288 12 b-
281.295 16 0.0074 3 b-
285.95 1 3.1 b-
305.22 8 0.00257 15 b-
314.85 15 0.00028 3 b-
323.95 9 0.00152 15 b-
327.526 10 0.00372 19 b-
350.016 10 0.00034 b-
350.71 7 0.00149 9 b-
353.46 11 0.00031 3 b-
359.57 7 0.00149 12 b-
506.093 10 0.00012 3 b-
528.587 10 0.00012 3 b-
531.61 6 0.00149 12 b-
535.897 12 0.0115 6 b-
544.27 6 0.00248 12 b-
547.17 7 0.00161 12 b-
550.01 15 0.00019 3 b-
552.92 9 0.00059 3 b-
558.372 10 0.0152 9 b-
568.36 7 0.0186 12 b-
571.08 9 0.00242 22 b-
590.88 1 0.069 3 b-
598.42 15 0.00022 3 b-
613.92 2 0.0149 9 b-
636.50 5 0.0093 6 b-
664.1 1 0.00078 9 b-
785.23 12 0.00037 6 b-
808.11 5 0.0164 12 b-
812.92 11 0.00031 3 b-
824.3 2 0.00012 3 b-
830.53 7 0.0325 25 b-
833.40 7 0.0332 25 b-
835.55 11 0.00108 9 b-
859.46 6 0.109 3 b-
881.98 5 0.0239 9 b-
915.5 3 0.000009 3 b-
930.2 2 0.00059 9 b-
950.6 2 0.00022 6 b-
952.8 1 0.00087 9 b-
964.4 5 0.0000031 9 b-
969.6 5 0.0000031 9 b-

X-rays from 149Pm (53.08 h 5)

E (keV) I (%) Assignment
4,993 0.0026 3 Sm Ll
5,589 0.00122 9 Sm Lh
5,610 0.0070 6 Sm La2
5,636 0.063 5 Sm La1
6,196 0.0164 25 Sm Lb4
6,206 0.050 4 Sm Lb1
6,317 0.027 4 Sm Lb3
6,371 0.00059 5 Sm Lb6
6,587 0.0134 12 Sm Lb2
7,183 0.0082 6 Sm Lg1
7,471 0.0051 8 Sm Lg2
7,489 0.0072 12 Sm Lg3
39,097 1.72E-05 5 Sm Ka3
39,522 0.0680 14 Sm Ka2
40,118 0.123 3 Sm Ka1
45,294 0.01203 25 Sm Kb3
45,414 0.0233 5 Sm Kb1
45,741 0.000345 14 Sm Kb5
46,578 0.00769 16 Sm Kb2
46,705 0.00291 12 Sm Kb4

Betas from 149Pm (53.08 h 5)

>Eb endpoint (keV) Ib (%) Decay mode
118,22 0.0015 2 b-
189,06 0.136 10 b-
235,41 0.0016 2 b-
237,77 0.035 4 b-
240,59 0.052 5 b-
285,77 0.00037 7 b-
406,95 0.00077 11 b-
434,54 0.027 2 b-
480,11 0.090 7 b-
512,63 0.035 3 b-
720,96 0.0013 3 b-
785,06 3.4 2 b-
793,92 0.027 2 b-
1048,49 48 b-
1071 95.9 3 b-