Isotopes of carbon

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Carbon has two stable, naturally occurring isotopes, carbon-12 and carbon-13.

Atomic weight

Ar(6C) = 12.0107(8)
Isotope Mass/u Amount
fraction
12C 12 0.9893(8)
13C 13.003 354 837 78(98) 0.0107(8)

Radiologically significant isotopes

Isotope Half life Decay mode Energy
MeV 		Weighted mean
energies/MeV 		Daughter
nuclide 		Ref.
11C 1223.1(12) s
(20.39(2) min) 		β+ (99.759(15)%) 0.3856(4) γ, X: 1.02
β, Auger: 0.385 		115B (stable) [1][2]
γ± (2×99.759%) 0.5110
X (ec) (0.0002%) 1.0 × 10−4
K-Auger (0.241(15)%) 1.7 × 10−4
14C 5.70(3) × 103 a β− (100%) 0.04947 β: 0.04947 147N (stable) [3][4]

All isotopes

Symbol Z(p) N(n) Mass/u Excess energy
MeV 		Binding energy/A
MeV 		β−-decay energy
MeV 		Spin Half life Decay mode,
energy
Excitation energy/MeV
8C 6 2 8.037 675(25) 35.094(23) 3.0978(29) — 0 2.0(4) zs 2p (100%)
9C 6 3 9.031 0367(23) 28.9105(21) 4.337 48(24) — (−3⁄2) 126.5(9) ms β+ (100%)
10C 6 4 10.016 853 23(43) 15.698 68(40) 6.032 041(40) −23.10(40) 0 19.290(12) s β+ (100%)
11C 6 5 11.011 433 61(102) 10.650 34(95) 6.676 370(86) −13.653(46) −3⁄2 20.39(2) min β+ (100%)
12C 6 6 12 0 7.680 144 −17.338 08(100) 0 STABLE
13C 6 7 13.003 354 837 78(98) 3.125 011 29(91) 7.469 849 −2.220 47(27) −1⁄2 STABLE
14C 6 8 14.003 241 9887(41) 3.019 8931(38) 7.520 319 0.156 476(4) 0 5.70(3) × 103 a β− (100%)
15C 6 9 15.010 5992(86) 9.873 14(80) 7.100 169(53) 9.771 71(80) +1⁄2 2.449(5) s β− (100%)
16C 6 10 16.014 7013(38) 13.6941(36) 6.922 05(22) 8.0105(44) 0 747(8) ms β− (100%)
17C 6 11 17.022 5861(187) 21.0388(174) 6.557 62(102) 13.167(23) (+3⁄2) 193(5) ms β− (100%)
18C 6 12 18.026 759(32) 24.926(30) 6.425 75(167) 11.812(35) 0 92(2) ms β− (100%)
19C 6 13 19.034 805(106) 32.421(98) 6.1179(52) 16.559(99) (+1⁄2) 46.2(23) ms β− (100%)
20C 6 14 20.040 32(26) 37.56(24) 5.9587(120) 15.79(25) 0 16(3) ms β− (100%)
21C 6 15 21.049 34(54)# 45.96(50)# 5.659(24)# 20.71(51)# +1⁄2# <30 ns ?n
22C 6 16 22.057 20(97)# 53.28(90)# 5.436(41)# 21.24(92)# 0 6.2(13) ms β− (100%)
Values marked # are estimated from systematic trends rather than experimentally measured.
Spins quoted in parentheses are uncertain in value and/or parity.
Sources: Except as otherwise noted,
isotopic masses and associated energies are taken from the AME 2003 dataset;[5]
nuclear spins and decay properties are taken from NUBASE 2003.[6]

References

  1. ↑ ENSDF Decay Data in the MIRD (Medical Internal Radiation Dose) Format for 11C; National Nuclear Data Center, <http://www.nndc.bnl.gov/useroutput/11c_mird.html>. (accessed 13 March 2010).
  2. ↑ Ajzenberg-Selove, F. Energy levels of light nuclei A = 11–12. Nucl. Phys. A 1990, 506 (1), 1–158. DOI: 10.1016/0375-9474(90)90271-M.
  3. ↑ ENSDF Decay Data in the MIRD (Medical Internal Radiation Dose) Format for 14C; National Nuclear Data Center, <http://www.nndc.bnl.gov/useroutput/14c_mird.html>. (accessed 13 March 2010).
  4. ↑ Ajzenberg-Selove, F. Energy levels of light nuclei A = 13–15. Nucl. Phys. A 1991, 523 (1), 1–196. DOI: 10.1016/0375-9474(91)90446-D.
  5. ↑ Wapstra, A. H.; Audi, G.; Thibault, C. The AME2003 atomic mass evaluation (I). Evaluation of input data, adjustment procedures. Nucl. Phys. A 2003, 729, 129–336. DOI: 10.1016/j.nuclphysa.2003.11.002. Wapstra, A. H.; Audi, G.; Thibault, C. The AME2003 atomic mass evaluation (II). Tables, graphs, and references. Nucl. Phys. A 2003, 729, 337–676. DOI: 10.1016/j.nuclphysa.2003.11.003. Data tables.
  6. ↑ Audi, G.; Bersillon, O.; Blachot, J.; Wapstra, A. H. The NUBASE evaluation of nuclear and decay properties. Nucl. Phys. A 2003, 729, 3–128. doi:10.1016/j.nuclphysa.2003.11.001, <http://amdc.in2p3.fr/nubase/Nubase2003.pdf>.
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