Isotopes of Actinium - Table

Table

nuclide
symbol
historic
name
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
206Ac 89 117 206.01450(8) 25(7) ms (3+)
206m1Ac 80(50) keV 15(6) ms
206m2Ac 290(110)# keV 41(16) ms (10-)
207Ac 89 118 207.01195(6) 31(8) ms
α 203Fr 9/2-#
208Ac 89 119 208.01155(6) 97(16) ms
α (99%) 204Fr (3+)
β+ (1%) 208Ra
208mAc 506(26) keV 28(7) ms
α (89%) 204Fr (10-)
IT (10%) 208Ac
β+ (1%) 208Ra
209Ac 89 120 209.00949(5) 92(11) ms α (99%) 205Fr (9/2-)
β+ (1%) 209Ra
210Ac 89 121 210.00944(6) 350(40) ms α (96%) 206Fr 7+#
β+ (4%) 210Ra
211Ac 89 122 211.00773(8) 213(25) ms α (99.8%) 207Fr 9/2-#
β+ (.2%) 211Ra
212Ac 89 123 212.00781(7) 920(50) ms α (97%) 208Fr 6+#
β+ (3%) 212Ra
213Ac 89 124 213.00661(6) 731(17) ms α 209Fr (9/2-)#
β+ (rare) 213Ra
214Ac 89 125 214.006902(24) 8.2(2) s α (89%) 210Fr (5+)#
β+ (11%) 214Ra
215Ac 89 126 215.006454(23) 0.17(1) s α (99.91%) 211Fr 9/2-
β+ (.09%) 215Ra
216Ac 89 127 216.008720(29) 0.440(16) ms α 212Fr (1-)
β+ (7×10−5%) 216Ra
216mAc 44(7) keV 443(7) µs (9-)
217Ac 89 128 217.009347(14) 69(4) ns α (98%) 213Fr 9/2-
β+ (2%) 217Ra
217mAc 2012(20) keV 740(40) ns (29/2)+
218Ac 89 129 218.01164(5) 1.08(9) µs α 214Fr (1-)#
218mAc 584(50)# keV 103(11) ns (11+)
219Ac 89 130 219.01242(5) 11.8(15) µs α 215Fr 9/2-
β+ (10−6%) 219Ra
220Ac 89 131 220.014763(16) 26.36(19) ms α 216Fr (3-)
β+ (5×10−4%) 220Ra
221Ac 89 132 221.01559(5) 52(2) ms α 217Fr 9/2-#
222Ac 89 133 222.017844(6) 5.0(5) s α (99%) 218Fr 1-
β+ (1%) 222Ra
222mAc 200(150)# keV 1.05(7) min α (88.6%) 218Fr high
IT (10%) 222Ac
β+ (1.4%) 222Ra
223Ac 89 134 223.019137(8) 2.10(5) min α (99%) 219Fr (5/2-)
EC (1%) 223Ra
CD (3.2×10−9%) 209Bi
14C
224Ac 89 135 224.021723(4) 2.78(17) h β+ (90.9%) 224Ra 0-
α (9.1%) 220Fr
β- (1.6%) 224Th
225Ac 89 136 225.023230(5) 10.0(1) d α 221Fr (3/2-)
CD (6×10−10%) 211Bi
14C
226Ac 89 137 226.026098(4) 29.37(12) h β- (83%) 226Th (1)(-#)
EC (17%) 226Ra
α (.006%) 222Fr
227Ac Actinium 89 138 227.0277521(26) 21.772(3) a β- (98.61%) 227Th 3/2- Trace
α (1.38%) 223Fr
228Ac Mesothorium 2 89 139 228.0310211(27) 6.15(2) h β- 228Th 3+ Trace
α (5.5×10−6%) 224Fr
229Ac 89 140 229.03302(4) 62.7(5) min β- 229Th (3/2+)
230Ac 89 141 230.03629(32) 122(3) s β- 230Th (1+)
231Ac 89 142 231.03856(11) 7.5(1) min β- 231Th (1/2+)
232Ac 89 143 232.04203(11) 119(5) s β- 232Th (1+)
233Ac 89 144 233.04455(32)# 145(10) s β- 233Th (1/2+)
234Ac 89 145 234.04842(43)# 44(7) s β- 234Th
235Ac 89 146 235.05123(38)# 40# s β- 235Th 1/2+#
236Ac 89 147 236.05530(54)# 2# min β- 236Th

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