About   |   More   |   Search

Chlorine-36

Properties and data of the isotope 36Cl.

 

Chlorine-36 is a radioisotope of the chemical element chlorine, which also occurs in nature, but only in extremely small amounts. The ratio to the other natural Cl isotopes is about 9 × 10-13 : 1.

Cl-36 is produced in the upper atmosphere by the interaction of Argon-36 with protons that reach Earth with cosmic rays (spallation ).

See also: list of Chlorine isotopes.

 

General data

Name of the isotope:Chlorine-36; Cl-36Symbol:36ClMass number A:36Atomic number Z:17 (= number of protons)Neutrons N:19Isotopic mass:35.96830682(4) u (atomic weight of Chlorine-36)Nuclide mass:35.9589811 u (calculated nuclear mass without electrons)Mass excess:-29.52201 MeVMass defect:0.329352128 u (per nucleus)Nuclear binding energy:306.78953112 MeV (per nucleus)
8.52193142 MeV (average binding energy per nucleon)
Separation energy:SN = 8.57979(0) MeV (first neutron)
SP = 7.96477(3) MeV (first proton)
Half-life:3.013(15) × 105 aDecay constant λ:7.294906222054 × 10-14 s-1Spin and parity:2+Year of discovery:1941

 

Radioactive Decay

Half-life T½ = 3.013(15) × 105 a respectively 9.501797 × 1012 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+36S1,9(1) %1,14214 MeV
β-36Ar98,1(1) %0,70955 MeV

 

Chlorine-36 radioactive decay

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Chlor
Isotopic mixture
35,45 u100 %
Isotope 35Cl34,9688527(3) u75,8 %stable3/2+
Isotope 36Cl35,96830682(4) u3.013(15) × 105 a2+
Isotope 37Cl36,9659026(4) u24,2 %stable3/2+

 

Radiation Protection

The German Radiation Protection Ordinance, for example, specifies the following limit values for the isotope Chlorine-36 (exemption limits, clearance values and other values as a radioactive or highly radioactive source of radiation (HASS)):

Isotope:Cl-36Exemption level:106 BqExemption level per gram:1 Bq/g
Unrestricted handling of solids and liquids.
Activity HASS:20 TBqSurface contamination:100 Bq/cm2Half-life:300000 a

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 36) with Chlorine-36. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 19Isobar A = 36
928F
1029Ne
1130Na36Na
1231Mg36Mg
1332Al36Al
1433Si36Si
1534P36P
1635S36S
1736Cl36Cl
1837Ar36Ar
1938K36K
2039Ca36Ca
2140Sc36Sc
2241Ti
2342V
2443Cr
2544Mn
2645Fe
2746Co

 

External data and identifiers

Adopted Levels, Gammas:NuDat 36Cl

 


Category: Isotopes

Last update: 26.11.2022



© 1996 - 2022 Internetchemistry

 

 




I agree!

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