Isotopes of Cesium (Z=55)

Click on an isotope to get more information about its decay
Isotope Half-life Spin Parity Decay Mode(s) or Abundance
112Cs 500 us %P=?
113Cs 17 us(5/2+) %P ~ 100, %EC+%B+ ~ 0.03
114Cs 0.57 s(1+) %EC+%B+ ~ 100, %A=0.018 6, %ECP=7 2, %ECA=0.16 6
115Cs 1.4 s %EC+%B+=100, %ECP ~ 0.07
116Cs 3.84 s >4+ %EC+%B+=100, %ECP=0.44 14, %ECA=0.08 2
116m1Cs 0.70 s(1+) %EC+%B+=100, %ECP=0.28 7, %ECA=0.049 25
117Cs 8.4 s (9/2+) %EC+%B+=100
117m1Cs 6.5 s (3/2+) %EC+%B+=100
118Cs 14 s2 %EC+%B+=100, %ECP<4.2E-2 6, %ECA<2.4E-3 4
118m1Cs 17 s(7-) %EC+%B+=100, %ECP<4.2E-2 6, %ECA<2.4E-3 4
119Cs 43.0 s9/2+ %EC+%B+=100
119m1Cs 30.4 s3/2(+) %EC+%B+=100
120Cs 64 s2 %EC+%B+=100
120m1Cs 57 s %EC+%B+=100, %ECP=7E-6 3, %ECA=2.0E-5 4
121Cs 155 s3/2(+) %EC+%B+=100
121m1Cs 122 s9/2(+) %EC+%B+=83, %IT=17
122Cs 21.0 s1+ %EC+%B+=100
122m1Cs 3.70 m8- %EC+%B+=100
122m2Cs 0.36 s(5)- %IT=100
123Cs 5.94 m1/2+ %EC+%B+=100
123m1Cs 1.64 s(11/2)- %IT=100
124Cs 30.8 s1+ %EC+%B+=100
124m1Cs 6.3 s(7)+ %IT=100
125Cs 45 m(1/2+) %EC+%B+=100
126Cs 1.64 m1+ %EC+%B+=100
127Cs 6.25 h1/2+ %EC+%B+=100
128Cs 3.66 m1+ %EC+%B+=100
129Cs 32.06 h1/2+ %EC+%B+=100
130Cs 29.21 m1+ %EC+%B+=98.4, %B-=1.6
130m1Cs 3.46 m 5- %IT=99.84 2, %EC+%B+=0.16 2
131Cs 9.689 d5/2+ %EC=100
132Cs 6.479 d 2+ %EC+%B+=98.13 9, %B-=1.87 9
133Cs stable7/2+ %Abundance=100
134Cs 2.0648 y4+ %B-=99.9997 1, %EC=0.0003 1
134m1Cs 2.903 h 8- %IT=100
135Cs 2.3e+6 y7/2+ %B-=100
135m1Cs 53 m19/2- %IT=100
136Cs 13.16 d5+ %B-=100
136m1Cs 19 s8- %IT=?, %B-=?
137Cs 30.07 y7/2+ %B-=100
138Cs 33.41 m3- %B-=100
138m1Cs 2.91 m6- %B-=19 2, %IT=81 2
139Cs 9.27 m7/2+ %B-=100
140Cs 63.7 s1- %B-=100
141Cs 24.94 s7/2+ %B-=100, %B-N=0.029 2
142Cs 1.70 s0- %B-=100, %B-N=0.091 3
143Cs 1.78 s3/2+ %B-=100, %B-N=1.62 10
144Cs 1.01 s1 %B-=100, %B-N=3.17 19
144m1Cs 1 s(GE 4) %B-=?
145Cs 0.594 s3/2+ %B-=100, %B-N=13.8 8
146Cs 0.321 s1- %B-=100 , %B-N=14.2 5
147Cs 0.225 s (3/2+) %B-=100, %B-N=43 5
148Cs 158 ms %B-=100, %B-N=25 3
149Cs
150Cs
151Cs
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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