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Standard atomic weight Ar°(Cu) | |||||||||||||||||||||||||||||||||
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Copper (29Cu) has two stable isotopes, 63Cu and 65Cu, along with 28 known radioisotopes from 55Cu to 84Cu. The most stable radioisotope, 67Cu, has a half-life of only 61.83 hours, then follow 64Cu at 12.70 hours and 61Cu at 3.34 hours. The others have half-lives all under an hour and most under a minute. The isotopes with mass below 63 generally undergo positron emission and electron capture to nickel isotopes, while isotopes with mass above 65 generally undergo β− decay to zinc isotopes. The single example in between, 64Cu, decays both ways.
There are at least 10 metastable isomers of copper, of which the most stable is 68mCu with a half-life of 3.75 minutes.
Nuclide [n 1] | Z | N | Isotopic mass (Da) [4] [n 2] [n 3] | Half-life [1] | Decay mode [1] [n 4] | Daughter isotope [n 5] | Spin and parity [1] [n 6] [n 7] | Natural abundance (mole fraction) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy [n 7] | Normal proportion [1] | Range of variation | |||||||||||||||||
55Cu | 29 | 26 | 54.96604(17) | 55.9(15) ms | β+ | 55Ni | 3/2−# | ||||||||||||
β+, p (?%) | 54Co | ||||||||||||||||||
56Cu | 29 | 27 | 55.9585293(69) | 80.8(6) ms | β+ (99.60%) | 56Ni | (4+) | ||||||||||||
β+, p (0.40%) | 55Co | ||||||||||||||||||
57Cu | 29 | 28 | 56.94921169(54) | 196.4(7) ms | β+ | 57Ni | 3/2− | ||||||||||||
58Cu | 29 | 29 | 57.94453228(60) | 3.204(7) s | β+ | 58Ni | 1+ | ||||||||||||
59Cu | 29 | 30 | 58.93949671(57) | 81.5(5) s | β+ | 59Ni | 3/2− | ||||||||||||
60Cu | 29 | 31 | 59.9373638(17) | 23.7(4) min | β+ | 60Ni | 2+ | ||||||||||||
61Cu | 29 | 32 | 60.9334574(10) | 3.343(16) h | β+ | 61Ni | 3/2− | ||||||||||||
62Cu | 29 | 33 | 61.9325948(07) | 9.672(8) min | β+ | 62Ni | 1+ | ||||||||||||
63Cu | 29 | 34 | 62.92959712(46) | Stable | 3/2− | 0.6915(15) | |||||||||||||
64Cu | 29 | 35 | 63.92976400(46) | 12.7004(13) h | β+ (61.52%) | 64Ni | 1+ | ||||||||||||
β− (38.48%) | 64Zn | ||||||||||||||||||
65Cu | 29 | 36 | 64.92778948(69) | Stable | 3/2− | 0.3085(15) | |||||||||||||
66Cu | 29 | 37 | 65.92886880(70) | 5.120(14) min | β− | 66Zn | 1+ | ||||||||||||
66mCu | 1154.2(14) keV | 600(17) ns | IT | 66Cu | (6)− | ||||||||||||||
67Cu | 29 | 38 | 66.92772949(96) | 61.83(12) h | β− | 67Zn | 3/2− | ||||||||||||
68Cu | 29 | 39 | 67.9296109(17) | 30.9(6) s | β− | 68Zn | 1+ | ||||||||||||
68mCu | 721.26(8) keV | 3.75(5) min | IT (86%) | 68Cu | 6− | ||||||||||||||
β− (14%) | 68Zn | ||||||||||||||||||
69Cu | 29 | 40 | 68.929429267(15) | 2.85(15) min | β− | 69Zn | 3/2− | ||||||||||||
69mCu | 2742.0(7) keV | 357(2) ns | IT | 69Cu | (13/2+) | ||||||||||||||
70Cu | 29 | 41 | 69.9323921(12) | 44.5(2) s | β− | 70Zn | 6− | ||||||||||||
70m1Cu | 101.1(3) keV | 33(2) s | β− (52%) | 70Zn | 3− | ||||||||||||||
IT (48%) | 70Cu | ||||||||||||||||||
70m2Cu | 242.6(5) keV | 6.6(2) s | β− (93.2%) | 70Zn | 1+ | ||||||||||||||
IT (6.8%) | 70Cu | ||||||||||||||||||
71Cu | 29 | 42 | 70.9326768(16) | 19.4(14) s | β− | 71Zn | 3/2− | ||||||||||||
71mCu | 2755.7(6) keV | 271(13) ns | IT | 71Cu | (19/2−) | ||||||||||||||
72Cu | 29 | 43 | 71.9358203(15) | 6.63(3) s | β− | 72Zn | 2− | ||||||||||||
72mCu | 270(3) keV | 1.76(3) μs | IT | 72Cu | (6−) | ||||||||||||||
73Cu | 29 | 44 | 72.9366744(21) | 4.20(12) s | β− (99.71%) | 73Zn | 3/2− | ||||||||||||
β−, n (0.29%) | 72Zn | ||||||||||||||||||
74Cu | 29 | 45 | 73.9398749(66) | 1.606(9) s | β− (99.93%) | 74Zn | 2− | ||||||||||||
β−, n (0.075%) | 73Zn | ||||||||||||||||||
75Cu | 29 | 46 | 74.94152382(77) | 1.224(3) s | β− (97.3%) | 75Zn | 5/2− | ||||||||||||
β−, n (2.7%) | 74Zn | ||||||||||||||||||
75m1Cu | 61.7(4) keV | 0.310(8) μs | IT | 75Cu | 1/2− | ||||||||||||||
75m2Cu | 66.2(4) keV | 0.149(5) μs | IT | 75Cu | 3/2− | ||||||||||||||
76Cu [5] | 29 | 47 | 75.9452370(21) | 1.27(30) s | β− (?%) | 76Zn | (1,2) | ||||||||||||
β−, n (?%) | 75Zn | ||||||||||||||||||
76mCu [5] | 64.8(25) keV | 637.7(55) ms | β− (?%) | 76Zn | 3− | ||||||||||||||
β−, n (?%) | 75Zn | ||||||||||||||||||
IT (10–17%) | 76Cu | ||||||||||||||||||
77Cu | 29 | 48 | 76.9475436(13) | 470.3(17) ms | β− (69.9%) | 77Zn | 5/2− | ||||||||||||
β−, n (30.1%) | 76Zn | ||||||||||||||||||
78Cu | 29 | 49 | 77.9519206(81) [6] | 330.7(20) ms | β−, n (50.6%) | 77Zn | (6−) | ||||||||||||
β− (49.4%) | 78Zn | ||||||||||||||||||
79Cu | 29 | 50 | 78.95447(11) | 241.3(21) ms | β−, n (66%) | 78Zn | (5/2−) | ||||||||||||
β− (34%) | 79Zn | ||||||||||||||||||
80Cu | 29 | 51 | 79.96062(32)# | 113.3(64) ms | β−, n (59%) | 79Zn | |||||||||||||
β− (41%) | 80Zn | ||||||||||||||||||
81Cu | 29 | 52 | 80.96574(32)# | 73.2(68) ms | β−, n (81%) | 80Zn | 5/2−# | ||||||||||||
β− (19%) | 81Zn | ||||||||||||||||||
82Cu | 29 | 53 | 81.97238(43)# | 34(7) ms | β− | 82Zn | |||||||||||||
83Cu | 29 | 54 | 82.97811(54)# | 21# ms [>410 ns] | 5/2−# | ||||||||||||||
84Cu [7] | 29 | 55 | 83.98527(54)# | ||||||||||||||||
This table header & footer: |
IT: | Isomeric transition |
n: | Neutron emission |
p: | Proton emission |
Both stable isotopes of copper (63Cu and 65Cu) have nuclear spin of 3/2−, and thus produce nuclear magnetic resonance spectra, although the spectral lines are broad due to quadrupolar broadening. 63Cu is the more sensitive nucleus while 65Cu yields very slightly narrower signals. Usually though 63Cu NMR is preferred. [8]
Copper offers a relatively large number of radioisotopes that are potentially useful for nuclear medicine.
There is growing interest in the use of 64Cu, 62Cu, 61Cu, and 60Cu for diagnostic purposes and 67Cu and 64Cu for targeted radiotherapy. For example, 64Cu has a longer half-life than most positron-emitters (12.7 hours) and is thus ideal for diagnostic PET imaging of biological molecules. [9]
Daughter products other than copper