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There are 42 isotopes of polonium (84Po). They range in size from 186 to 227 nucleons. They are all radioactive. 210Po with a half-life of 138.376 days has the longest half-life of any naturally-occurring isotope of polonium and is the most common isotope of polonium. It is also the most easily synthesized polonium isotope. 209Po, which does not occur naturally, has the longest half-life of all isotopes of polonium at 124 years. 209Po can be made by using a cyclotron to bombard bismuth with protons, as can 208Po.[2]
List of isotopes
Nuclide [n 1] |
Historic name |
Z | N | Isotopic mass (Da) [n 2][n 3] |
Half-life |
Decay mode |
Daughter isotope [n 4][n 5] |
Spin and parity [n 6][n 7] |
Isotopic abundance |
---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 7] | |||||||||
186Po | 84 | 102 | 186.004403(20) | 28+16 −6 μs |
α | 182Pb | 0+ | ||
187Po | 84 | 103 | 187.003030(40) | 1.40(25) ms | α | 183Pb | 1/2−, 5/2− | ||
187mPo | 4(27) keV | 0.5 ms | α | 183Pb | 13/2+# | ||||
188Po | 84 | 104 | 187.999416(21) | 270(30) μs | α | 184Pb | 0+ | ||
189Po | 84 | 105 | 188.998473(24) | 3.5(5) ms | α | 185Pb | (5/2−) | ||
190Po | 84 | 106 | 189.995102(14) | 2.45(5) ms | α | 186Pb | 0+ | ||
191Po | 84 | 107 | 190.994558(8) | 22(1) ms | α | 187Pb | 3/2− | ||
191mPo | 61(11) keV | 93(3) ms | α | 187mPb | 13/2+ | ||||
192Po | 84 | 108 | 191.991340(11) | 32.2(3) ms | α | 188Pb | 0+ | ||
192mPo | 2294.6(10) keV | 580(100) ns | IT | 192Po | 11- | ||||
193Po | 84 | 109 | 192.991062(16) | 399(34) ms | α | 189Pb | 3/2− | ||
193mPo | 100(6) keV | 245(11) ms | α | 189mPb | 13/2+ | ||||
194Po | 84 | 110 | 193.988186(14) | 392(4) ms | α | 190Pb | 0+ | ||
194mPo | 2313.4(3) keV | 12.9(5) μs | IT | 194Po | (10−) | ||||
195Po | 84 | 111 | 194.988066(6) | 4.64(9) s | α (94%) | 191Pb | 3/2− | ||
β+? | 195Bi | ||||||||
195mPo | 148(9) keV | 1.92(2) s | α | 191mPb | 13/2+ | ||||
196Po | 84 | 112 | 195.985541(6) | 5.56(12) s | α (94%) | 192Pb | 0+ | ||
β+? | 196Bi | ||||||||
196mPo | 2493.9(4) keV | 856(17) ns | IT | 196Po | 11− | ||||
197Po | 84 | 113 | 196.985622(11) | 53.6(9) s | β+? | 197Bi | (3/2−) | ||
α (44%) | 193Pb | ||||||||
197mPo | 196(12)# keV | 25.8(1) s | α (84%) | 193mPb | 13/2+ | ||||
β+? | 197Bi | ||||||||
IT? | 197Po | ||||||||
198Po | 84 | 114 | 197.983389(19) | 1.760(24) min | α (57%) | 194Pb | 0+ | ||
β+ (43%) | 198Bi | ||||||||
198m1Po | 2565.92(20) keV | 200(20) ns | IT | 198Po | 11− | ||||
198m2Po | 2740(50)# keV | 750(50) ns | IT | 198Po | 12+ | ||||
199Po | 84 | 115 | 198.983666(25) | 5.48(16) min | β+ (92.5%) | 199Bi | (3/2−) | ||
α (7.5%) | 195Pb | ||||||||
199mPo | 312.0(28) keV | 4.17(4) min | β+ (73.5%) | 199Bi | 13/2+ | ||||
α (24%) | 195Pb | ||||||||
IT (2.5%) | 199Po | ||||||||
200Po | 84 | 116 | 199.981799(15) | 11.5(1) min | β+ (88.8%) | 200Bi | 0+ | ||
α (11.1%) | 196Pb | ||||||||
201Po | 84 | 117 | 200.982260(6) | 15.3(2) min | β+ (98.4%) | 201Bi | 3/2− | ||
α (1.6%) | 197Pb | ||||||||
201mPo | 424.1(24) keV | 8.9(2) min | IT (56.2(12)%) | 201Po | 13/2+ | ||||
β+ (41.4(7)%) | 201Bi | ||||||||
α (2.4(5)%) | 197Pb | ||||||||
202Po | 84 | 118 | 201.980758(16) | 44.7(5) min | β+ (98%) | 202Bi | 0+ | ||
α (2%) | 198Pb | ||||||||
202mPo | 2626.7(7) keV | >200 ns | 11− | ||||||
203Po | 84 | 119 | 202.981420(28) | 36.7(5) min | β+ (99.89%) | 203Bi | 5/2− | ||
α (.11%) | 199Pb | ||||||||
203m1Po | 641.49(17) keV | 45(2) s | IT (99.96%) | 203Po | 13/2+ | ||||
α (.04%) | 199Pb | ||||||||
203m2Po | 2158.5(6) keV | >200 ns | |||||||
204Po | 84 | 120 | 203.980318(12) | 3.53(2) h | β+ (99.33%) | 204Bi | 0+ | ||
α (.66%) | 200Pb | ||||||||
205Po | 84 | 121 | 204.981203(21) | 1.66(2) h | β+ (99.96%) | 205Bi | 5/2− | ||
α (.04%) | 201Pb | ||||||||
205m1Po | 143.166(17) keV | 310(60) ns | 1/2− | ||||||
205m2Po |
Zdroj:https://en.wikipedia.org?pojem=Polonium-211 Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.
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