148m Pm
61 87
Half life: 41.29 d 11
Jp: 6-
Decay mode: b-, IT
Ex(keV): 137.9
Sn (keV): 5897 6
Sp (keV): 6011 6
E(level): 137.9 keV
Prod. mode: Fission product
Fast neutron activation
Literature cut-off date: 31-Jul-1989
Author(s): L.K. Peker
ENSDF citation: NDS 59,393 (1990)

Decay properties

Mode Branching (%) Q-value (keV)
b- 95.0 4 2468 6
IT 5.0 4

Gammas from 148mPm (41.29 d 11)

Eg (keV) Ig (%) Decay mode
62.2 IT
75.7 1 1.11 3 IT
98.530 20 2.46 4 b-
189.721 16 1.10 3 b-
288.141 13 12.51 9 b-
299.1 3 0.089 18 b-
311.570 20 3.90 4 b-
362.5 3 0.177 18 b-
414.028 12 18.59 15 b-
432.745 8 5.33 6 b-
460.57 3 0.417 18 b-
501.312 11 6.72 7 b-
534.38 7 0.28 3 b-
550.284 12 94.5 7 b-
553.231 14 0.40 4 b-
571.962 7 0.213 9 b-
599.81 3 12.49 12 b-
611.293 8 5.46 9 b-
629.987 8 89 b-
714.769 13 0.045 5 b-
725.673 9 32.7 3 b-
915.331 8 17.10 18 b-
1013.808 11 20.20 17 b-
1344.740 23 0.058 4 b-

X-rays from 148mPm (41.29 d 11)

E (keV) I (%) Assignment
4,809 0.0172 18 Pm Ll
4,993 0.0176 18 Sm Ll
5,363 0.0084 6 Pm Lh
5,408 0.046 3 Pm La2
5,432 0.42 3 Pm La1
5,589 0.0067 5 Sm Lh
5,610 0.047 3 Sm La2
5,636 0.42 3 Sm La1
5,957 0.0111 17 Pm Lb4
5,961 0.331 25 Pm Lb1
6,071 0.019 3 Pm Lb3
6,128 0.00373 25 Pm Lb6
6,196 0.023 4 Sm Lb4
6,206 0.272 21 Sm Lb1
6,317 0.038 6 Sm Lb3
6,339 0.088 6 Pm Lb2
6,371 0.00395 25 Sm Lb6
6,587 0.090 6 Sm Lb2
6,892 0.054 4 Pm Lg1
7,183 0.045 4 Sm Lg1
7,186 0.0034 6 Pm Lg2
7,186 0.0048 8 Pm Lg3
7,471 0.0070 11 Sm Lg2
7,489 0.0100 16 Sm Lg3
37,756 1.94E-04 8 Pm Ka3
38,171 0.89 3 Pm Ka2
38,725 1.61 6 Pm Ka1
39,097 0.000457 16 Sm Ka3
39,522 1.80 5 Sm Ka2
40,118 3.26 9 Sm Ka1
43,713 0.157 5 Pm Kb3
43,827 0.303 10 Pm Kb1
44,145 0.00435 21 Pm Kb5
44,942 0.099 3 Pm Kb2
45,064 0.0375 18 Pm Kb4
45,294 0.319 9 Sm Kb3
45,414 0.617 17 Sm Kb1
45,741 0.0091 4 Sm Kb5
46,578 0.204 6 Sm Kb2
46,705 0.077 3 Sm Kb4

Betas from 148mPm (41.29 d 11)

>Eb endpoint (keV) Ib (%) Decay mode
411,83 47.5 10 b-
510,31 21.6 3 b-
699,98 21.0 4 b-
1011,61 0.76 10 b-