About   |   More   |   Search

Carbon-14

Properties and data of the isotope 14C.

 

See also: list of Carbon isotopes.

 

General data

Name of the isotope:Carbon-14; C-14Namen:Radiokohlenstoff. RadiocarbonSymbol:14CMass number A:14Atomic number Z:6 (= number of protons)Neutrons N:8Isotopic mass:14.003241988(4) u (atomic weight of Carbon-14)Nuclide mass:13.9999505 u (calculated nuclear mass without electrons)Mass excess:3.01989 MeVMass defect:0.113027532 u (per nucleus)Nuclear binding energy:105.28446789 MeV (per nucleus)
7.52031914 MeV (average binding energy per nucleon)
Separation energy:SN = 8.17643(0) MeV (first neutron)
SP = 20.831(1) MeV (first proton)
Half-life:5700(30) aDecay constant λ:3.855958948375 × 10-12 s-1Spin and parity:0+isobaric spin: 1Year of discovery:1936

 

Radioactive Decay

Half-life T½ = 5700(30) a respectively 1.7976 × 1011 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-14N100 %0,156476(4) MeV

 

Parent Nuclides

Direct parent isotope is: 14B.

 

Occurrence

Comparison of the natural Kohlenstoff isotopes including isotopic abundance (proportion of the isotope mixture):

 

Atomic Mass maQuantityHalf-lifeSpin
Kohlenstoff
Isotopic mixture
12,011 u100 %
Isotope 12C12,00000000000 u98,94 %stable0+
Isotope 13C13,003354835(2) u1,06 %stable1/2-
Isotope 14C14,003241988(4) u5700(30) a0+

 

Radiation Protection

The German Radiation Protection Ordinance, for example, specifies the following limit values for the isotope Carbon-14 (exemption limits, clearance values and other values as a radioactive or highly radioactive source of radiation (HASS)):

Isotope:C-14Exemption level:107 BqExemption level per gram:1 Bq/g
Unrestricted handling of solids and liquids.
Activity HASS:50 TBqSurface contamination:100 Bq/cm2Half-life:5700 a

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 8) and isobaric (same nucleon number A = 14) with Carbon-14. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 8Isobar A = 14
210He
311Li
412Be14Be
513B14B
614C14C
715N14N
816O14O
917F14F
1018Ne
1119Na
1220Mg
1321Al
1422Si

 

External data and identifiers

Adopted Levels, Gammas:NuDat 14C

 


Category: Isotopes

Last update: 11.10.2020



© 1996 - 2022 Internetchemistry

 

 




I agree!

This site uses cookies. By using this website, you agree to the use of cookies! Learn more ...