Isotopes of Caesium - Table

Table

nuclide
symbol		 Z(p) N(n)
isotopic mass (u)
 half-life decay
mode(s)		 daughter
isotope(s)		 nuclear
spin		 representative
isotopic
composition
(mole fraction)		 range of natural
variation
(mole fraction)
excitation energy
112Cs 55 57 111.95030(33)# 500(100) µs p 111Xe 1+#
α 108I
113Cs 55 58 112.94449(11) 16.7(7) µs p (99.97%) 112Xe 5/2+#
β+ (.03%) 113Xe
114Cs 55 59 113.94145(33)# 0.57(2) s β+ (91.09%) 114Xe (1+)
β+, p (8.69%) 113I
β+, α (.19%) 110Te
α (.018%) 110I
115Cs 55 60 114.93591(32)# 1.4(8) s β+ (99.93%) 115Xe 9/2+#
β+, p (.07%) 114I
116Cs 55 61 115.93337(11)# 0.70(4) s β+ (99.67%) 116Xe (1+)
β+, p (.279%) 115I
β+, α (.049%) 112Te
116mCs 100(60)# keV 3.85(13) s β+ (99.48%) 116Xe 4+,5,6
β+, p (.51%) 115I
β+, α (.008%) 112Te
117Cs 55 62 116.92867(7) 8.4(6) s β+ 117Xe (9/2+)#
117mCs 150(80)# keV 6.5(4) s β+ 117Xe 3/2+#
118Cs 55 63 117.926559(14) 14(2) s β+ (99.95%) 118Xe 2
β+, p (.042%) 117I
β+, α (.0024%) 114Te
118mCs 100(60)# keV 17(3) s β+ (99.95%) 118Xe (7-)
β+, p (.042%) 117I
β+, α (.0024%) 114Te
119Cs 55 64 118.922377(15) 43.0(2) s β+ 119Xe 9/2+
β+, α (2×10−6%) 115Te
119mCs 50(30)# keV 30.4(1) s β+ 119Xe 3/2(+)
120Cs 55 65 119.920677(11) 61.2(18) s β+ 120Xe 2(-#)
β+, α (2×10−5%) 116Te
β+, p (7×10−6%) 118I
120mCs 100(60)# keV 57(6) s β+ 120Xe (7-)
β+, α (2×10−5%) 116Te
β+, p (7×10−6%) 118I
121Cs 55 66 120.917229(15) 155(4) s β+ 121Xe 3/2(+)
121mCs 68.5(3) keV 122(3) s β+ (83%) 121Xe 9/2(+)
IT (17%) 121Cs
122Cs 55 67 121.91611(3) 21.18(19) s β+ 122Xe 1+
β+, α (2×10−7%) 118Te
122m1Cs 45.8 keV >1 µs (3)+
122m2Cs 140(30) keV 3.70(11) min β+ 122Xe 8-
122m3Cs 127.0(5) keV 360(20) ms (5)-
123Cs 55 68 122.912996(13) 5.88(3) min β+ 123Xe 1/2+
123m1Cs 156.27(5) keV 1.64(12) s IT 123Cs (11/2)-
123m2Cs 231.63+X keV 114(5) ns (9/2+)
124Cs 55 69 123.912258(9) 30.9(4) s β+ 124Xe 1+
124mCs 462.55(17) keV 6.3(2) s IT 124Cs (7)+
125Cs 55 70 124.909728(8) 46.7(1) min β+ 125Xe 1/2(+)
125mCs 266.6(11) keV 900(30) ms (11/2-)
126Cs 55 71 125.909452(13) 1.64(2) min β+ 126Xe 1+
126m1Cs 273.0(7) keV >1 µs
126m2Cs 596.1(11) keV 171(14) µs
127Cs 55 72 126.907418(6) 6.25(10) h β+ 127Xe 1/2+
127mCs 452.23(21) keV 55(3) µs (11/2)-
128Cs 55 73 127.907749(6) 3.640(14) min β+ 128Xe 1+
129Cs 55 74 128.906064(5) 32.06(6) h β+ 129Xe 1/2+
130Cs 55 75 129.906709(9) 29.21(4) min β+ (98.4%) 130Xe 1+
β- (1.6%) 130Ba
130mCs 163.25(11) keV 3.46(6) min IT (99.83%) 130Cs 5-
β+ (.16%) 130Xe
131Cs 55 76 130.905464(5) 9.689(16) d EC 131Xe 5/2+
132Cs 55 77 131.9064343(20) 6.480(6) d β+ (98.13%) 132Xe 2+
β- (1.87%) 132Ba
133Cs 55 78 132.905451933(24) Stable 7/2+ 1.0000
134Cs 55 79 133.906718475(28) 2.0652(4) a β- 134Ba 4+
EC (3×10−4%) 134Xe
134mCs 138.7441(26) keV 2.912(2) h IT 134Cs 8-
135Cs 55 80 134.9059770(11) 2 300 000 years β- 135Ba 7/2+
135mCs 1632.9(15) keV 53(2) min IT 135Cs 19/2-
136Cs 55 81 135.9073116(20) 13.16(3) d β- 136Ba 5+
136mCs 518(5) keV 19(2) s β- 136Ba 8-
IT 136Cs
137Cs 55 82 136.9070895(5) 30.1671(13) a β- (95%) 137mBa 7/2+
β- (5%) 137Ba
138Cs 55 83 137.911017(10) 33.41(18) min β- 138Ba 3-
138mCs 79.9(3) keV 2.91(8) min IT (81%) 138Cs 6-
β- (19%) 138Ba
139Cs 55 84 138.913364(3) 9.27(5) min β- 139Ba 7/2+
140Cs 55 85 139.917282(9) 63.7(3) s β- 140Ba 1-
141Cs 55 86 140.920046(11) 24.84(16) s β- (99.96%) 141Ba 7/2+
β-, n (.0349%) 140Ba
142Cs 55 87 141.924299(11) 1.689(11) s β- (99.9%) 142Ba 0-
β-, n (.091%) 141Ba
143Cs 55 88 142.927352(25) 1.791(7) s β- (98.38%) 143Ba 3/2+
β-, n (1.62%) 142Ba
144Cs 55 89 143.932077(28) 994(4) ms β- (96.8%) 144Ba 1(-#)
β-, n (3.2%) 143Ba
144mCs 300(200)# keV <1 s β- 144Ba (>3)
IT 144Cs
145Cs 55 90 144.935526(12) 582(6) ms β- (85.7%) 145Ba 3/2+
β-, n (14.3%) 144Ba
146Cs 55 91 145.94029(8) 0.321(2) s β- (85.8%) 146Ba 1-
β-, n (14.2%) 145Ba
147Cs 55 92 146.94416(6) 0.235(3) s β- (71.5%) 147Ba (3/2+)
β-, n (28.49%) 147Ba
148Cs 55 93 147.94922(62) 146(6) ms β- (74.9%) 148Ba
β-, n (25.1%) 147Ba
149Cs 55 94 148.95293(21)# 150# ms β- 149Ba 3/2+#
β-, n 148Ba
150Cs 55 95 149.95817(32)# 100# ms β- 150Ba
β-, n 149Ba
151Cs 55 96 150.96219(54)# 60# ms β- 151Ba 3/2+#
β-, n 150Ba

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