Appendix G Half-Lives
This was originally from the 1st Canadian Edition of College Chemistry which is also based on Open Stax College Chemistry
Please note that y = years, d = days, h = hours, m = minutes and s = seconds, E.C. = electron capture, S.F. = spontaneous fission
| Half-Lives for Several Radioactive Isotopes | |||||
|---|---|---|---|---|---|
| Isotope | Half-Life | Type of Emission | Isotope | Half-Life | Type of Emission |
| [latex]_6^{14}\text{C}[/latex] | 5730 y | β- | [latex]_{83}^{210}\text{Bi}[/latex] | 5.01 d | β- |
| [latex]_7^{13}\text{N}[/latex] | 9.97 m | β+ | [latex]_{83}^{212}\text{Bi}[/latex] | 60.55 m | α or β- |
| [latex]_9^{15}\text{F}[/latex] | 4.1 × 10−22 s | [latex](p)[/latex] | [latex]_{84}^{210}\text{Po}[/latex] | 138.4 d | [latex]({\alpha})[/latex] |
| [latex]_{11}^{24}\text{Na}[/latex] | 15.00 h | β- | [latex]_{84}^{212}\text{Po}[/latex] | 3 × 10−7 s | α |
| [latex]_{15}^{32}\text{P}[/latex] | 14.29 d | β- | [latex]_{84}^{216}\text{Po}[/latex] | 0.15 s | α |
| [latex]_{19}^{40}\text{K}[/latex] | 1.27 × 109 y | [latex]({\beta}\;\text{or}\;E.C.)[/latex] | [latex]_{84}^{218}\text{Po}[/latex] | 3.05 m | α |
| [latex]_{26}^{49}\text{Fe}[/latex] | 0.08 s | [latex]({\beta}+)[/latex] | [latex]_{85}^{215}\text{At}[/latex] | 1.0 × 10−4 s | α |
| [latex]_{26}^{60}\text{Fe}[/latex] | 2.6 × 106 y | β- | [latex]_{85}^{218}\text{At}[/latex] | 1.6 s | α |
| [latex]_{27}^{60}\text{Co}[/latex] | 5.27 y | β- | [latex]_{86}^{220}\text{Rn}[/latex] | 55.6 s | α |
| [latex]_{37}^{87}\text{Rb}[/latex] | 4.7 × 1010 y | β- | [latex]_{86}^{222}\text{Rn}[/latex] | 3.82 d | α |
| [latex]_{38}^{90}\text{Sr}[/latex] | 29 y | β- | [latex]_{88}^{224}\text{Ra}[/latex] | 3.66 d | α |
| [latex]_{49}^{115}\text{In}[/latex] | 5.1 × 1015 y | β- | [latex]_{88}^{226}\text{Ra}[/latex] | 1600 y | α |
| [latex]_{53}^{131}\text{I}[/latex] | 8.040 d | β- | [latex]_{88}^{228}\text{Ra}[/latex] | 5.75 y | β- |
| [latex]_{58}^{142}\text{Ce}[/latex] | 5 × 1015 y | α | [latex]_{89}^{228}\text{Ac}[/latex] | 6.13 h | β- |
| [latex]_{81}^{208}\text{Tl}[/latex] | 3.07 m | β- | [latex]_{90}^{228}\text{Th}[/latex] | 1.913 y | α |
| [latex]_{82}^{210}\text{Pb}[/latex] | 22.3 y | β- | [latex]_{90}^{232}\text{Th}[/latex] | 1.4 × 1010 y | [latex]({\alpha})[/latex] |
| [latex]_{82}^{212}\text{Pb}[/latex] | 10.6 h | β- | [latex]_{90}^{233}\text{Th}[/latex] | 22 m | β- |
| [latex]_{82}^{214}\text{Pb}[/latex] | 26.8 m | β- | [latex]_{90}^{234}\text{Th}[/latex] | 24.10 d24.10 d | β- |
| [latex]_{83}^{206}\text{Bi}[/latex] | 6.243 d | [latex](E.C.)[/latex] | [latex]_{91}^{233}\text{Pa}[/latex] | 27 d | β- |
| [latex]_{92}^{233}\text{U}[/latex] | 1.59 × 105 y | [latex]({\alpha})[/latex] | [latex]_{96}^{242}\text{Cm}[/latex] | 162.8 d | [latex]({\alpha})[/latex] |
| [latex]_{92}^{234}\text{U}[/latex] | 2.45 × 105 y | [latex]({\alpha})[/latex] | [latex]_{97}^{243}\text{Bk}[/latex] | 4.5 h | [latex]({\alpha}\;\text{or}\;E.C.)[/latex] |
| [latex]_{92}^{235}\text{U}[/latex] | 7.03 × 108 y | α | [latex]_{99}^{253}\text{Es}[/latex] | 20.47 d | [latex]({\alpha})[/latex] |
| [latex]_{92}^{238}\text{U}[/latex] | 4.47 × 109 y | α | [latex]_{100}^{254}\text{Fm}[/latex] | 3.24 h | [latex]({\alpha}\;\text{or}\;S.F.)[/latex] |
| [latex]_{92}^{239}\text{U}[/latex] | 23.54 m | β- | [latex]_{100}^{255}\text{Fm}[/latex] | 20.1 h | α |
| [latex]_{93}^{239}\text{Np}[/latex] | 2.3 d | β- | [latex]_{101}^{256}\text{Md}[/latex] | 76 m | [latex]({\alpha}\;\text{or}\;E.C.)[/latex] |
| [latex]_{94}^{239}\text{Pu}[/latex] | 2.407 × 104 y | α | [latex]_{102}^{254}\text{No}[/latex] | 55 s | α |
| [latex]_{94}^{239}\text{Pu}[/latex] | 6.54 × 103 y | α | [latex]_{103}^{257}\text{Lr}[/latex] | 0.65 s | α |
| [latex]_{94}^{241}\text{Pu}[/latex] | 14.4 y | [latex]({\alpha}\;\text{or}\;{\beta}-)[/latex] | [latex]_{105}^{260}\text{Ha}[/latex] | 1.5 s | [latex]({\alpha}\;\text{or}\;S.F.)[/latex] |
| [latex]_{95}^{241}\text{Am}[/latex] | 432.2 y | [latex]({\alpha})[/latex] | [latex]_{106}^{263}\text{Sg}[/latex] | 0.8 s | [latex]({\alpha}\;\text{or}\;S.F.)[/latex] |
