釙有42个已知的同位素，都具有放射性，目前已觀測到的釙同位素質量數在186到227之間，其中有9個屬於痕量存在的天然放射性核素，當中以最為穩定。至於比更加穩定的和只能在回旋加速器中人工轟擊而成。
圖表
{{Isotopes table
|mass_ref=
|halflife_ref=
|decay_ref=
|spin_ref=
|-
| style="text-indent:1em" | 210mPo
|
| colspan="3" style="text-indent:2em" | 5057.61(4) keV
| 263(5) ns
|
|
| 16+
|
|-
| 211Po
| Actinium C'
| style="text-align:right" | 84
| style="text-align:right" | 127
| 210.9866532(14)
| 0.516(3) s
|
| 207Pb
| 9/2+
| 痕量
|-
| rowspan=2 style="text-indent:1em" | 211m1Po
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 1462(5) keV
| rowspan=2|25.2(6) s
| (99.98%)
| 207Pb
| rowspan=2|(25/2+)
| rowspan=2|
|-
| IT (.016%)
| 211Po
|-
| style="text-indent:1em" | 211m2Po
|
| colspan="3" style="text-indent:2em" | 2135.7(9) keV
| 243(21) ns
|
|
| (31/2−)
|
|-
| style="text-indent:1em" | 211m3Po
|
| colspan="3" style="text-indent:2em" | 4873.3(17) keV
| 2.8(7) µs
|
|
| (43/2+)
|
|-
| 212Po
| Thorium C'
| style="text-align:right" | 84
| style="text-align:right" | 128
| 211.9888680(13)
| 299(2) ns
|
| 208Pb
| 0+
| 痕量
|-
| rowspan=2 style="text-indent:1em" | 212mPo
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 2911(12) keV
| rowspan=2|45.1(6) s
| (99.93%)
| 208Pb
| rowspan=2|(18+)
| rowspan=2|
|-
| IT (.07%)
| 212Po
|-
| 213Po
|
| style="text-align:right" | 84
| style="text-align:right" | 129
| 212.992857(3)
| 3.65(4) µs
|
| 209Pb
| 9/2+
|痕量
|-
| 214Po
| Radium C'
| style="text-align:right" | 84
| style="text-align:right" | 130
| 213.9952014(16)
| 164.3(20) µs
|
| 210Pb
| 0+
| 痕量
|-
| rowspan=2|215Po
| rowspan=2|Actinium A
| rowspan=2 style="text-align:right" | 84
| rowspan=2 style="text-align:right" | 131
| rowspan=2|214.9994200(27)
| rowspan=2|1.781(4) ms
| (99.99%)
| 211Pb
| rowspan=2|9/2+
| rowspan=2|痕量
|-
| (2.3×10−4%)
| 215At
|-
|216Po
|Thorium A
| style="text-align:right" | 84
| style="text-align:right" | 132
|216.0019150(24)
|0.145(2) s
|
| 212Pb
|0+
|痕量
|-
| rowspan=2|217Po
| rowspan=2|
| rowspan=2 style="text-align:right" | 84
| rowspan=2 style="text-align:right" | 133
| rowspan=2|217.006335(7)
| rowspan=2|1.47(5) s
| (95%)
| 213Pb
| rowspan=2|5/2+#
| rowspan=2|
|-
| (5%)
| 217At
|-
| rowspan=2|218Po
| rowspan=2|Radium A
| rowspan=2 style="text-align:right" | 84
| rowspan=2 style="text-align:right" | 134
| rowspan=2|218.0089730(26)
| rowspan=2|3.10(1) min
| (99.98%)
| 214Pb
| rowspan=2|0+
| rowspan=2|痕量
|-
| (.02%)
| 218At
|-
| rowspan=2|219Po
| rowspan=2|
| rowspan=2 style="text-align:right" | 84
| rowspan=2 style="text-align:right" | 135
| rowspan=2|219.01361(16)
| rowspan=2|10.3(1) min
| α (28.2%)
| 215Pb
| rowspan=2|9/2+#
| rowspan=2|
|-
| β− (71.8%)
| 219At
|-
| 220Po
|
| style="text-align:right" | 84
| style="text-align:right" | 136
| 220.0164(18)
| 40# s
[>300 ns]
| β−
| 220At
| 0+
|
|-
| 221Po
|
| style="text-align:right" | 84
| style="text-align:right" | 137
| 221.02123(20)
| 2.2(0.7) min
| β−
| 221At
| 9/2+#
|
|-
| 222Po
|
| style="text-align:right" | 84
| style="text-align:right" | 138
| 222.024144(40)
| 9.1(7.2) min
| β−
| 222At
| 0+
|
|}
参考文獻
- Isotope masses from [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
* David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition*, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
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