Isotopes of polonium

More information Nuclide, Historic name ...

Nuclide ^{[n 1]}	Historic name	Z	N	Isotopic mass (Da)^[3] ^{[n 2]}^{[n 3]}	Half-life^[1]	Decay mode^[1]	Daughter isotope ^{[n 4]}^{[n 5]}	Spin and parity^[1] ^{[n 6]}^{[n 7]}	Isotopic abundance
Nuclide ^{[n 1]}	Historic name	Excitation energy^{[n 7]}			Half-life^[1]	Decay mode^[1]	Daughter isotope ^{[n 4]}^{[n 5]}	Spin and parity^[1] ^{[n 6]}^{[n 7]}	Isotopic abundance
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^{[n 8]}		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−
¹⁹⁵Po		84	111	194.988066(6)	4.64(9) s	β⁺ (6%)	¹⁹⁵Bi	3/2−
^195mPo		148(9) keV			1.92(2) s	α	^191mPb	13/2+
¹⁹⁶Po		84	112	195.985541(6)	5.63(7) s	α (94%)	¹⁹²Pb	0+
¹⁹⁶Po		84	112	195.985541(6)	5.63(7) s	β⁺ (6%)	¹⁹⁶Bi	0+
^196mPo		2493.9(4) keV			856(17) ns	IT	¹⁹⁶Po	11−
¹⁹⁷Po		84	113	196.985622(11)	53.6(9) s	β⁺ (56%)	¹⁹⁷Bi	(3/2−)
¹⁹⁷Po		84	113	196.985622(11)	53.6(9) s	α (44%)	¹⁹³Pb	(3/2−)
^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+
¹⁹⁸Po		84	114	197.983389(19)	1.760(24) min	β⁺ (43%)	¹⁹⁸Bi	0+
^198m1Po		2565.92(20) keV			200(20) ns	IT	¹⁹⁸Po	11−
^198m2Po		2740(50)# keV			750(50) ns	IT	¹⁹⁸Po	12+
¹⁹⁹Po		84	115	198.983640(6)	5.47(15) min	β⁺ (92.5%)	¹⁹⁹Bi	3/2−
¹⁹⁹Po		84	115	198.983640(6)	5.47(15) min	α (7.5%)	¹⁹⁵Pb	3/2−
^199mPo		311.7(27) keV			4.17(5) min	β⁺ (73.5%)	¹⁹⁹Bi	13/2+
						α (24%)	¹⁹⁵Pb
						IT (2.5%)	¹⁹⁹Po
²⁰⁰Po		84	116	199.981812(8)	11.51(8) min	β⁺ (88.9%)	²⁰⁰Bi	0+
²⁰⁰Po		84	116	199.981812(8)	11.51(8) min	α (11.1%)	¹⁹⁶Pb	0+
^200m1Po		2596.1(3) keV			100(10) ns	IT	²⁰⁰Po	11-
^200m2Po		2817(7) keV			268(3) ns	IT	²⁰⁰Po	12+
²⁰¹Po		84	117	200.982264(5)	15.6(1) min	β⁺ (98.87%)	²⁰¹Bi	3/2−
²⁰¹Po		84	117	200.982264(5)	15.6(1) min	α (1.13%)	¹⁹⁷Pb	3/2−
^201mPo		423.8(24) keV			8.96(12) min	IT (56.2(12)%)	²⁰¹Po	13/2+
						β⁺ (41.4(7)%)	²⁰¹Bi
						α (2.4(5)%)	¹⁹⁷Pb
²⁰²Po		84	118	201.980739(9)	44.6(4) min	β⁺ (98.08%)	²⁰²Bi	0+
²⁰²Po		84	118	201.980739(9)	44.6(4) min	α (1.92%)	¹⁹⁸Pb	0+
^202mPo		1712(12) keV			110(15) ns	IT	²⁰²Po	8+
²⁰³Po		84	119	202.981416(5)	36.7(5) min	β⁺ (99.89%)	²⁰³Bi	5/2−
²⁰³Po		84	119	202.981416(5)	36.7(5) min	α (0.11%)	¹⁹⁹Pb	5/2−
^203m1Po		641.68(14) keV			45(2) s	IT	²⁰³Po	13/2+
^203m1Po		641.68(14) keV			45(2) s	α ?	¹⁹⁹Pb	13/2+
^203m2Po		2158.5(6) keV			>200 ns	IT	²⁰³Po
²⁰⁴Po		84	120	203.980310(11)	3.519(12) h	β⁺ (99.33%)	²⁰⁴Bi	0+
²⁰⁴Po		84	120	203.980310(11)	3.519(12) h	α (0.67%)	²⁰⁰Pb	0+
^204mPo		1639.03(6) keV			158.6(18) ns	IT	²⁰⁸Po	8+
²⁰⁵Po		84	121	204.981190(11)	1.74(8) h	β⁺ (99.96%)	²⁰⁵Bi	5/2−
²⁰⁵Po		84	121	204.981190(11)	1.74(8) h	α (0.04%)	²⁰¹Pb	5/2−
^205m1Po		143.166(15) keV			310(60) ns	IT	²⁰⁵Po	1/2−
^205m2Po		880.31(4) keV			645(20) μs	IT	²⁰⁵Po	13/2+
^205m3Po		1461.21(21) keV			57.4(9) ms	IT	²⁰⁵Po	19/2−
^205m4Po		3087.2(4) keV			115(10) ns	IT	²⁰⁵Po	29/2−
²⁰⁶Po		84	122	205.980474(4)	8.8(1) d	β⁺ (94.55%)	²⁰⁶Bi	0+
²⁰⁶Po		84	122	205.980474(4)	8.8(1) d	α (5.45%)	²⁰²Pb	0+
^206m1Po		1585.90(11) keV			232(4) ns	IT	²⁰⁶Po	8+
^206m2Po		2262.09(12) keV			1.05(6) μs	IT	²⁰⁶Po	9−
²⁰⁷Po		84	123	206.981593(7)	5.80(2) h	β⁺ (99.979%)	²⁰⁷Bi	5/2−
²⁰⁷Po		84	123	206.981593(7)	5.80(2) h	α (0.021%)	²⁰³Pb	5/2−
^207m1Po		68.557(14) keV			205(10) ns	IT	²⁰⁷Po	1/2−
^207m2Po		1115.076(17) keV			49(4) μs	IT	²⁰⁷Po	13/2+
^207m3Po		1383.16(7) keV			2.79(8) s	IT	²⁰⁷Po	19/2−
²⁰⁸Po		84	124	207.9812460(18)	2.898(2) y	α	²⁰⁴Pb	0+
²⁰⁸Po		84	124	207.9812460(18)	2.898(2) y	β⁺ (0.0042%)	²⁰⁸Bi	0+
^208mPo		1528.22(4) keV			373(8) ns	IT	²⁰⁸Po	8+
²⁰⁹Po		84	125	208.9824304(19)	124(3) y	α (99.546%)	²⁰⁵Pb	1/2−
²⁰⁹Po		84	125	208.9824304(19)	124(3) y	β⁺ (0.454%)	²⁰⁹Bi	1/2−
^209mPo		4265.4(3) keV			119(4) ns	IT	²⁰⁹Po	31/2−
²¹⁰Po^{[n 9]}	Radium F	84	126	209.9828737(12)	138.376(2) d	α	²⁰⁶Pb	0+	Trace^{[n 10]}
^210m1Po		1556.97(3) keV			98.9(25) ns	IT	²¹⁰Po	8+
^210m2Po		5057.65(5) keV			263(5) ns	IT	²¹⁰Po	16+
²¹¹Po	Actinium C'	84	127	210.9866532(13)	516(3) ms	α	²⁰⁷Pb	9/2+	Trace^{[n 11]}
^211m1Po		1462(5) keV			25.2(6) s	α (99.984%)	²⁰⁷Pb	(25/2+)
^211m1Po		1462(5) keV			25.2(6) s	IT (0.016%)	²¹¹Po	(25/2+)
^211m2Po		2135(5) keV			243(21) ns	IT	²¹¹Po	(31/2−)
^211m3Po		4872(6) keV			2.8(7) μs	IT	²¹¹Po	(43/2+)
²¹²Po	Thorium C'	84	128	211.9888680(12)	294.4(8) ns	α	²⁰⁸Pb	0+	Trace^{[n 12]}
^212mPo		2923(4) keV			45.1(6) s	α (99.93%)	²⁰⁸Pb	(18+)
^212mPo		2923(4) keV			45.1(6) s	IT (0.07%)	²¹²Po	(18+)
²¹³Po		84	129	212.992857(3)	3.705(1) μs	α	²⁰⁹Pb	9/2+	Trace^{[n 13]}
²¹⁴Po	Radium C'	84	130	213.9952013(16)	163.47(3) μs	α	²¹⁰Pb	0+	Trace^{[n 10]}
²¹⁵Po	Actinium A	84	131	214.9994184(23)	1.781(5) ms	α	²¹¹Pb	9/2+	Trace^{[n 11]}
²¹⁵Po	Actinium A	84	131	214.9994184(23)	1.781(5) ms	β⁻ (2.3×10⁻⁴%)	²¹⁵At	9/2+	Trace^{[n 11]}
²¹⁶Po	Thorium A	84	132	216.0019134(19)	144.0(6) ms	α^{[n 14]}	²¹²Pb	0+	Trace^{[n 12]}
²¹⁷Po		84	133	217.006316(7)	1.53(5) s	α (97.5%)	²¹³Pb	(9/2+)	Trace^{[n 13]}
²¹⁷Po		84	133	217.006316(7)	1.53(5) s	β⁻ (2.5%)	²¹⁷At	(9/2+)	Trace^{[n 13]}
²¹⁸Po	Radium A	84	134	218.0089712(21)	3.097(12) min	α (99.98%)	²¹⁴Pb	0+	Trace^{[n 10]}
²¹⁸Po	Radium A	84	134	218.0089712(21)	3.097(12) min	β⁻ (0.02%)	²¹⁸At	0+	Trace^{[n 10]}
²¹⁹Po		84	135	219.013614(17)	10.3(10) min	β⁻ (71.8%)	²¹⁹At	9/2+#
²¹⁹Po		84	135	219.013614(17)	10.3(10) min	α (28.2%)	²¹⁵Pb	9/2+#
²²⁰Po		84	136	220.016386(19)	10# s [>300 ns]	β⁻ ?	²²⁰At	0+
²²¹Po		84	137	221.021228(21)	2.2 +/- 0.7 min	β⁻	²²¹At	9/2+#
²²²Po		84	138	222.02414(4)	9.1 +/- 7.2 min	β⁻	²²²At	0+
²²³Po		84	139	223.02907(21)#	6# s [>300 ns]	β⁻ ?	²²³At	11/2+#
²²⁴Po		84	140	224.03211(21)#	3# min [>300 ns]	β⁻ ?	²²⁴At	0+
²²⁵Po		84	141	225.03712(32)#	10# s [>300 ns]	β⁻ ?	²²⁵At	3/2+#
²²⁶Po		84	142	226.04031(43)#	1# min [>300 ns]	β⁻ ?	²²⁶At	0+
²²⁷Po		84	143	227.04539(43)#	2# s [>300 ns]	β⁻ ?	²²⁷At	5/2+#
This table header & footer: view

[1]
^mPo – Excited nuclear isomer.
[2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
[3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
[4]
Bold italics symbol as daughter – Daughter product is nearly stable.
[5]
Bold symbol as daughter – Daughter product is stable.
[6]
( ) spin value – Indicates spin with weak assignment arguments.
[7]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
[8]
Order of ground state and isomer is uncertain.
[9]
Most common isotope
[10]
Intermediate decay product of ²³⁸U
[11]
Intermediate decay product of ²³⁵U
[12]
Intermediate decay product of ²³²Th
[13]
Intermediate decay product of ²³⁷Np
[14]
Theoretically capable of β⁻β⁻ decay to ²¹⁶Rn

Daughter products other than polonium

Isotopes of polonium

List of isotopes

References

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