Isotopes of polonium

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Polonium (Po) has no stable isotopes. A standard atomic mass cannot be given.

[edit] Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
188Po 84 104 187.999422(21) 430(180) µs [0.40(+20-15) ms] 0+
189Po 84 105 188.998481(24) 5(1) ms 3/2-#
190Po 84 106 189.995101(14) 2.46(5) ms 0+
191Po 84 107 190.994574(12) 22(1) ms 3/2-#
191mPo 130(21) keV 93(3) ms (13/2+)
192Po 84 108 191.991335(13) 32.2(3) ms 0+
192mPo 2600(500)# keV ~1 µs 12+#
193Po 84 109 192.99103(4) 420(40) ms [370(+46-40) ms] 3/2-#
193mPo 100(30)# keV 240(10) ms [243(+11-10) ms] (13/2+)
194Po 84 110 193.988186(13) 0.392(4) s 0+
194mPo 2525(2) keV 15(2) µs (11-)
195Po 84 111 194.98811(4) 4.64(9) s 3/2-#
195mPo 110(50) keV 1.92(2) s 13/2+#
196Po 84 112 195.985535(14) 5.56(12) s 0+
196mPo 2490.5(17) keV 850(90) ns (11-)
197Po 84 113 196.98566(5) 53.6(10) s (3/2-)
197mPo 230(80)# keV 25.8(1) s (13/2+)
198Po 84 114 197.983389(19) 1.77(3) min 0+
198m1Po 2565.92(20) keV 200(20) ns 11-
198m2Po 2691.86(20) keV 750(50) ns 12+
199Po 84 115 198.983666(25) 5.48(16) min (3/2-)
199mPo 312.0(28) keV 4.17(4) min 13/2+
200Po 84 116 199.981799(15) 11.5(1) min 0+
201Po 84 117 200.982260(6) 15.3(2) min 3/2-
201mPo 424.1(24) keV 8.9(2) min 13/2+
202Po 84 118 201.980758(16) 44.7(5) min 0+
202mPo 2626.7(7) keV >200 ns 11-
203Po 84 119 202.981420(28) 36.7(5) min 5/2-
203m1Po 641.49(17) keV 45(2) s 13/2+
203m2Po 2158.5(6) keV >200 ns
204Po 84 120 203.980318(12) 3.53(2) h 0+
205Po 84 121 204.981203(21) 1.66(2) h 5/2-
205m1Po 143.166(17) keV 310(60) ns 1/2-
205m2Po 880.30(4) keV 645 µs 13/2+
205m3Po 1461.21(21) keV 57.4(9) ms 19/2-
205m4Po 3087.2(4) keV 115(10) ns 29/2-
206Po 84 122 205.980481(9) 8.8(1) d 0+
206m1Po 1585.85(11) keV 222(10) ns (8+)#
206m2Po 2262.22(14) keV 1.05(6) µs (9-)#
207Po 84 123 206.981593(7) 5.80(2) h 5/2-
207m1Po 68.573(14) keV 205(10) ns 1/2-
207m2Po 1115.073(16) keV 49(4) µs 13/2+
207m3Po 1383.15(6) keV 2.79(8) s 19/2-
208Po 84 124 207.9812457(19) 2.898(2) a 0+
209Po 84 125 208.9824304(20) 102(5) a 1/2-
210Po 84 126 209.9828737(13) 138.376(2) d 0+
210mPo 5057.61(4) keV 263(5) ns 16+
211Po 84 127 210.9866532(14) 0.516(3) s 9/2+
211m1Po 1462(5) keV 25.2(6) s (25/2+)
211m2Po 2135.7(9) keV 243(21) ns (31/2-)
211m3Po 4873.3(17) keV 2.8(7) µs (43/2+)
212Po 84 128 211.9888680(13) 299(2) ns 0+
212mPo 2911(12) keV 45.1(6) s (18+)
213Po 84 129 212.992857(3) 3.65(4) µs 9/2+
214Po 84 130 213.9952014(16) 164.3(20) µs 0+
215Po 84 131 214.9994200(27) 1.781(4) ms 9/2+
216Po 84 132 216.0019150(24) 0.145(2) s 0+
217Po 84 133 217.006335(7) 1.47(5) s 5/2+#
218Po 84 134 218.0089730(26) 3.10(1) min 0+
219Po 84 135 219.01374(39)# 2# min [>300 ns] 7/2+#
220Po 84 136 220.01660(39)# 40# s [>300 ns] 0+

[edit] Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.
  • Half-life abbreviations are a=annum(year), d=day, min=minute, s=second, ms=millisecond, µs=microsecond, ns=nanosecond.

[edit] References


Isotopes of bismuth Isotopes of polonium Isotopes of astatine
Index to isotope pages

Isotopes of polonium

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