Half-Lives for Several Radioactive Isotopes

Isotope Half-Life[5] Type of Emission[6] Isotope Half-Life[7] Type of Emission[8]
614C{}_{6}^{14}\text{C}
5730 y\text{5730 y}
(β)\left({\beta }^{-}\right)
83210Bi{}_{83}^{210}\text{Bi}
5.01 d\text{5}.0\text{1 d}
(β)\left({\beta }^{-}\right)
713N{}_{7}^{13}\text{N}
9.97 m\text{9}\text{.97 m}
(β+)\left({\beta }^{+}\right)
83212Bi{}_{83}^{212}\text{Bi}
60.55 m\text{6}0.\text{55 m}
(α or β)\left(\alpha \text{ or }{\beta }^{-}\right)
915F{}_{9}^{15}\text{F}
4.1×1022s4.1 \times {10}^{-22}\text{s}
(p)\left(p\right)
84210Po{}_{84}^{210}\text{Po}
138.4 d\text{138}.\text{4 d}
(α)\left(\alpha \right)
1124Na{}_{11}^{24}\text{Na}
15.00 h\text{15}\text{.00 h}
(β)\left({\beta }^{-}\right)
84212Po{}_{84}^{212}\text{Po}
3×107s3 \times {10}^{-7}\text{s}
(α)\left(\alpha \right)
1532P{}_{15}^{32}\text{P}
14.29 d\text{14}\text{.29 d}
(β)\left({\beta }^{-}\right)
84216Po{}_{84}^{216}\text{Po}
0.15 s0.\text{15 s}
(α)\left(\alpha \right)
1940K{}_{19}^{40}\text{K}
1.27×109y1.27 \times {10}^{9}\text{y}
(β or E.C.)\left(\beta \text{ or }E.C.\right)
84218Po{}_{84}^{218}\text{Po}
3.05 m\text{3}.0\text{5 m}
(α)\left(\alpha \right)
2649Fe{}_{26}^{49}\text{Fe}
0.08 s\text{0}\text{.08 s}
(β+)\left({\beta }^{+}\right)
85215At{}_{85}^{215}\text{At}
1.0×104s1.0 \times {10}^{-4}\text{s}
(α)\left(\alpha \right)
2660Fe{}_{26}^{60}\text{Fe}
2.6×106y2.6 \times {10}^{6}\text{y}
(β)\left({\beta }^{-}\right)
85218At{}_{85}^{218}\text{At}
1.6 s\text{1}.\text{6 s}
(α)\left(\alpha \right)
2760Co{}_{27}^{60}\text{Co}
5.27 y\text{5}\text{.27 y}
(β)\left({\beta }^{-}\right)
86220Rn{}_{86}^{220}\text{Rn}
55.6 s\text{55}.\text{6 s}
(α)\left(\alpha \right)
3787Rb{}_{37}^{87}\text{Rb}
4.7×1010y4.7 \times {10}^{10}\text{y}
(β)\left({\beta }^{-}\right)
86222Rn{}_{86}^{222}\text{Rn}
3.82 d\text{3}.\text{82 d}
(α)\left(\alpha \right)
3890Sr{}_{38}^{90}\text{Sr}
29 y\text{29 y}
(β)\left({\beta }^{-}\right)
88224Ra{}_{88}^{224}\text{Ra}
3.66 d\text{3}.\text{66 d}
(α)\left(\alpha \right)
49115In{}_{49}^{115}\text{In}
5.1×1015y5.1 \times {10}^{15}\text{y}
(β)\left({\beta }^{-}\right)
88226Ra{}_{88}^{226}\text{Ra}
1600 y\text{16}00\text{ y}
(α)\left(\alpha \right)
53131I{}_{53}^{131}\text{I}
8.040 d\text{8}\text{.040 d}
(β)\left({\beta }^{-}\right)
88228Ra{}_{88}^{228}\text{Ra}
5.75 y\text{5}.\text{75 y}
(β)\left({\beta }^{-}\right)
58142Ce{}_{58}^{142}\text{Ce}
5×1015y5 \times {10}^{15}\text{y}
(α)\left(\alpha \right)
89228Ac{}_{89}^{228}\text{Ac}
6.13 h\text{6}.\text{13 h}
(β)\left({\beta }^{-}\right)
81208Tl{}_{81}^{208}\text{Tl}
3.07 m\text{3}\text{.07 m}
(β)\left({\beta }^{-}\right)
90228Th{}_{90}^{228}\text{Th}
1.913 y\text{1}.\text{913 y}
(α)\left(\alpha \right)
82210Pb{}_{82}^{210}\text{Pb}
22.3 y\text{22}\text{.3 y}
(β)\left({\beta }^{-}\right)
90232Th{}_{90}^{232}\text{Th}
1.4×1010y1.4 \times {10}^{10}\text{y}
(α)\left(\alpha \right)
82212Pb{}_{82}^{212}\text{Pb}
10.6 h\text{10}\text{.6 h}
(β)\left({\beta }^{-}\right)
90233Th{}_{90}^{233}\text{Th}
22 m\text{22 m}
(β)\left({\beta }^{-}\right)
82214Pb{}_{82}^{214}\text{Pb}
26.8 m\text{26}\text{.8 m}
(β)\left({\beta }^{-}\right)
90234Th{}_{90}^{234}\text{Th}
24.10 d\text{24}.\text{1}0\text{ d}
(β)\left({\beta }^{-}\right)
83206Bi{}_{83}^{206}\text{Bi}
6.243 d\text{6}\text{.243 d}
(E.C.)\left(E.C.\right)
91233Pa{}_{91}^{233}\text{Pa}
27 d\text{27 d}
(β)\left({\beta }^{-}\right)
92233U{}_{92}^{233}\text{U}
1.59×105y1.59 \times {10}^{5}\text{y}
(α)\left(\alpha \right)
96242Cm{}_{96}^{242}\text{Cm}
162.8 d\text{162}.\text{8 d}
(α)\left(\alpha \right)
92234U{}_{92}^{234}\text{U}
2.45×105y2.45 \times {10}^{5}\text{y}
(α)\left(\alpha \right)
97243Bk{}_{97}^{243}\text{Bk}
4.5 h\text{4}.\text{5 h}
(α or E.C.)\left(\alpha \text{ or }E.C.\right)
92235U{}_{92}^{235}\text{U}
7.03×108y7.03 \times {10}^{8}\text{y}
(α)\left(\alpha \right)
99253Es{}_{99}^{253}\text{Es}
20.47 d\text{2}0.\text{47 d}
(α)\left(\alpha \right)
92238U{}_{92}^{238}\text{U}
4.47×109y4.47 \times {10}^{9}\text{y}
(α)\left(\alpha \right)
100254Fm{}_{100}^{254}\text{Fm}
3.24 h\text{3}.\text{24 h}
(α or S.F.)\left(\alpha \text{ or }S.F.\right)
92239U{}_{92}^{239}\text{U}
23.54 m\text{23}\text{.54 m}
(β)\left({\beta }^{-}\right)
100255Fm{}_{100}^{255}\text{Fm}
20.1 h\text{2}0.\text{1 h}
(α)\left(\alpha \right)
93239Np{}_{93}^{239}\text{Np}
2.3 d\text{2}\text{.3 d}
(β)\left({\beta }^{-}\right)
101256Md{}_{101}^{256}\text{Md}
76 m\text{76 m}
(α or E.C.)\left(\alpha \text{ or }E.C.\right)
94239Pu{}_{94}^{239}\text{Pu}
2.407×104y2.407 \times {10}^{4}\text{y}
(α)\left(\alpha \right)
102254No{}_{102}^{254}\text{No}
55 s\text{55 s}
(α)\left(\alpha \right)
94240Pu{}_{94}^{240}\text{Pu}
6.54×103y6.54 \times {10}^{3}\text{y}
(α)\left(\alpha \right)
103257Lr{}_{103}^{257}\text{Lr}
0.65 s0.\text{65 s}
(α)\left(\alpha \right)
94241Pu{}_{94}^{241}\text{Pu}
14.4 y\text{14}\text{.4 y}
(α or β)\left(\alpha \text{ or }{\beta }^{-}\right)
105260Ha{}_{105}^{260}\text{Ha}
1.5 s\text{1}.\text{5 s}
(α or S.F.)\left(\alpha \text{ or }S.F.\right)
95241Am{}_{95}^{241}\text{Am}
432.2 y\text{432}\text{.2 y}
(α)\left(\alpha \right)
106263Sg{}_{106}^{263}\text{Sg}
0.8 s0.\text{8 s}
(α or S.F.)\left(\alpha \text{ or }S.F.\right)


  1. y "= years, d = days, h = hours, m = minutes, s = seconds"
  2. E.. "= electron capture, S.F. = Spontaneous fission"
  3. y "= years, d = days, h = hours, m = minutes, s = seconds"
  4. E.. "= electron capture, S.F. = Spontaneous fission"
  5. y "= years, d = days, h = hours, m = minutes, s = seconds"
  6. E.. "= electron capture, S.F. = Spontaneous fission"
  7. y "= years, d = days, h = hours, m = minutes, s = seconds"
  8. E.. "= electron capture, S.F. = Spontaneous fission"

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