Isotopes of Thorium - Table

Table

nuclide
symbol		 historic
name		 Z(p) N(n)
isotopic mass (u)
 half-life decay
mode(s)		 daughter
isotopes(s)		 nuclear
spin		 representative
isotopic
composition
(mole fraction)		 range of natural
variation
(mole fraction)
excitation energy
209Th 90 119 209.01772(11) 7(5) ms
 5/2-#
210Th 90 120 210.015075(27) 17(11) ms
 α 206Ra 0+
β+ (rare) 210Ac
211Th 90 121 211.01493(8) 48(20) ms
 α 207Ra 5/2-#
β+ (rare) 211Ac
212Th 90 122 212.01298(2) 36(15) ms
 α (99.7%) 208Ra 0+
β+ (.3%) 212Ac
213Th 90 123 213.01301(8) 140(25) ms α 209Ra 5/2-#
β+ (rare) 213Ac
214Th 90 124 214.011500(18) 100(25) ms α 210Ra 0+
215Th 90 125 215.011730(29) 1.2(2) s α 211Ra (1/2-)
216Th 90 126 216.011062(14) 26.8(3) ms α (99.99%) 212Ra 0+
β+ (.006%) 216Ac
216m1Th 2042(13) keV 137(4) µs (8+)
216m2Th 2637(20) keV 615(55) ns (11-)
217Th 90 127 217.013114(22) 240(5) µs α 213Ra (9/2+)
218Th 90 128 218.013284(14) 109(13) ns α 214Ra 0+
219Th 90 129 219.01554(5) 1.05(3) µs α 215Ra 9/2+#
β+ (10−7%) 219Ac
220Th 90 130 220.015748(24) 9.7(6) µs α 216Ra 0+
EC (2×10−7%) 220Ac
221Th 90 131 221.018184(10) 1.73(3) ms α 217Ra (7/2+)
222Th 90 132 222.018468(13) 2.237(13) ms α 218Ra 0+
EC (1.3×10−8%) 222Ac
223Th 90 133 223.020811(10) 0.60(2) s α 219Ra (5/2)+
224Th 90 134 224.021467(12) 1.05(2) s α 220Ra 0+
β+β+ (rare) 224Ra
225Th 90 135 225.023951(5) 8.72(4) min α (90%) 221Ra (3/2)+
EC (10%) 225Ac
226Th 90 136 226.024903(5) 30.57(10) min α 222Ra 0+
227Th Radioactinium 90 137 227.0277041(27) 18.68(9) d α 223Ra 1/2+ Trace
228Th Radiothorium 90 138 228.0287411(24) 1.9116(16) a α 224Ra 0+ Trace
CD (1.3×10−11%) 208Pb
20O
229Th 90 139 229.031762(3) 7.34(16)×103 a α 225Ra 5/2+
229mTh 0.0076(5) keV 70(50) h IT 229Th 3/2+
230Th Ionium 90 140 230.0331338(19) 7.538(30)×104 a α 226Ra 0+ Trace
CD (5.6×10−11%) 206Hg
24Ne
SF (5×10−11%) (Various)
231Th Uranium Y 90 141 231.0363043(19) 25.52(1) h β- 231Pa 5/2+ Trace
α (10−8%) 227Ra
232Th Thorium 90 142 232.0380553(21) 1.405(6)×1010 a α 228Ra 0+ 1.0000
β-β- (rare) 232U
SF (1.1×10−9%) (various)
CD (2.78×10−10%) 182Yb
26Ne
24Ne
233Th 90 143 233.0415818(21) 21.83(4) min β- 233Pa 1/2+
234Th Uranium X1 90 144 234.043601(4) 24.10(3) d β- 234mPa 0+ Trace
235Th 90 145 235.04751(5) 7.2(1) min β- 235Pa (1/2+)#
236Th 90 146 236.04987(21)# 37.5(2) min β- 236Pa 0+
237Th 90 147 237.05389(39)# 4.8(5) min β- 237Pa 5/2+#
238Th 90 148 238.0565(3)# 9.4(20) min β- 238Pa 0+

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