Isotopes of Promethium (Z=61)

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Isotope Half-life Spin Parity Decay Mode(s) or Abundance
128Pm %EC+%B+=100
129Pm
130Pm 2.2 s %EC+%B+=100, %ECP=?
131Pm
132Pm 6.3 s (3+) %EC+%B+=100 , %ECP ~ 5E-5
133Pm 3/2+ %EC+%B+=100
133m1Pm 15 s11/2- %EC+%B+=100, %IT=?
134Pm 5 s (2+) %EC+%B+=100
134m1Pm 22 s(5+) %EC+%B+=100
135Pm 45 s(11/2-) %EC+%B+=100
135m1Pm 49 s (3/2+,5/2+) %EC+%B+=100
136Pm 47 s (2+) %EC+%B+=100
136m1Pm 107 s(5-) %EC+%B+=100
137Pm 2.4 m11/2- %EC+%B+=100
138Pm 10 s1+ %EC+%B+=100
138m1Pm 3.24 m(5-) %EC+%B+=?, %IT=?
139Pm 4.15 m(5/2)+ %EC+%B+=100
139m1Pm 180 ms(11/2)- %IT=99.94 +5-20, %EC+%B+=0.06 +20-5
140Pm 9.2 s1+ %EC+%B+=100
140m1Pm 5.95 m 7- %EC+%B+=100
140m2Pm 5.95 m8- %EC+%B+=100
141Pm 20.90 m5/2+ %EC+%B+=100
142Pm 40.5 s1+ %EC+%B+=100
142m1Pm 2.0 ms(8)- %IT=100
143Pm 265 d5/2+ %EC+%B+=100
144Pm 363 d5- %EC+%B+=100
145Pm 17.7 y5/2+ %EC=100, %A=2.8E-7
146Pm 5.53 y3- %EC=66.0 13, %B-=34.0 13
147Pm 2.6234 y 7/2+ %B-=100
148Pm 5.370 d1- %B-=100
148m1Pm 41.29 d6- %B-=95.0 4 , %IT=5.0 4
149Pm 53.08 h7/2+ %B-=100
150Pm 2.68 h(1-) %B-=100
151Pm 28.40 h5/2+ %B-=100
152Pm 4.12 m1+ %B-=100
152m1Pm 7.52 m4- %B-=100
152m2Pm 13.8 m(8) %B- < 100, %IT > 0
153Pm 5.25 m5/2- %B-=100
154Pm 1.73 m(0,1) %B-=100
154m1Pm 2.68 m (3,4) %B-=100
155Pm 41.5 s(5/2-) %B-=100
156Pm 26.70 s 4(-) %B-=100
157Pm 10.56 s (5/2-) %B-=100
158Pm 4.8 s %B-=100
159Pm
160Pm
161Pm
162Pm
163Pm
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory
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