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Isotopes of argon
Argon isotopes are used asrecursors in the production of radioisotopes. Ar-40 and Ar-38 are used in the production of radioactive K-38 which can be used as a blood flow tracer. Ar-40 is used in the production of radioactive Ar-41 which is used to trace gas flows. Argon isotopes can be obtained from Trace Sciences International.
Naturally occurring isotopes
This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of argon are listed (including any which occur naturally) below.
Isotope |
Atomic mass (ma/u) |
Natural abundance (atom %) |
Nuclear spin (I) |
Magnetic moment (μ/μN) |
36Ar |
35.96754552 (29) |
0.3365 (30) |
0 |
0 |
38Ar | 37.9627325 (9)
0.0632 (5) |
0 |
0 |
40Ar |
39.9623837 (14) |
99.6003 (30) |
0 |
0 |
In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances whictotal 100% for all the naturally occurring isotopes.
Radiosotope data
Further data for naturally occuring isotopes of argon are listed above. This table gives information about some radiosotopes of argon, their masses, their half-lives, their modesf decay, their nuclear spins, and their nuclear magnetic moments.
Isotope |
Mass |
Half-life |
Mode of decay |
Nuclear spin |
Nuclear magnetic moment |
35Ar |
34.975257 |
1.77 s |
EC to 35Cl |
3/2 |
0.633 |
37Ar36.966776 |
35.0 d |
EC to 37Cl |
3/2 |
1.15 |
39Ar |
38.962314 |
268 y |
β- to 39K |
7/2 |
-1.3 |
41Ar |
40.964501 |
1.82 h |
β- to 41K |
7/2 |
|
42Ar |
41.9650 |
33 y |
β- to 42K |
0 |
|
43Ar |
42.9657 |
5.4 m |
β- to 43K |
|
|
44Ar |
43.963650 |
11.87 m |
β- to 44K |
0 |
|
References
- Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70
- Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]
- For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
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