# Isotopes of rhenium

Naturally occurring rhenium ($_{75}$Re) is 37.4% $^{185}$Re, which is stable (although it is predicted to decay), and 62.6% $^{187}$Re, which is unstable but has a very long half-life (4.12×10$^{10}$ years). Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope.
There are 36 other unstable isotopes recognized, the longest-lived of which are $^{183}$Re with a half-life of 70 days, $^{184}$Re with a half-life of 38 days, $^{186}$Re with a half-life of 3.7186 days, $^{182}$Re with a half-life of 64.0 hours, and $^{189}$Re with a half-life of 24.3 hours. There are also numerous isomers, the longest-lived of which are $^{186m}$Re with a half-life of 200,000 years and $^{184m}$Re with a half-life of 177.25 days. All others have half-lives less than a day.

## List of isotopes

| Nuclide | Z | N | Isotopic mass (Da) | Half-life | Decay mode | Daughter isotope | Spin and parity | Natural abundance (mole fraction) | Natural abundance (mole fraction) |
| Nuclide | Excitation energy | Excitation energy | Excitation energy | Half-life | Decay mode | Daughter isotope | Spin and parity | Normal proportion | Range of variation |
| $^{159}$Re | 75 | 84 | | 21(4) μs | p (92.5%) | $^{158}$W | (11/2−) | | |
| $^{159}$Re | 75 | 84 | | 21(4) μs | α (7.5%) | $^{155}$Ta | (11/2−) | | |
| $^{160}$Re | 75 | 85 | 159.98212(43)# | 611(7) μs | p (89%) | $^{159}$W | (2−) | | |
| $^{160}$Re | 75 | 85 | 159.98212(43)# | 611(7) μs | α (11%) | $^{156}$Ta | (2−) | | |
| $^{160m}$Re | 185(21)# keV | 185(21)# keV | 185(21)# keV | 2.8(1) μs | IT | $^{160}$Re | (9+) | | |
| $^{161}$Re | 75 | 86 | 160.97759(22) | 0.37(4) ms | p | $^{160}$W | 1/2+ | | |
| $^{161m}$Re | 123.8(13) keV | 123.8(13) keV | 123.8(13) keV | 15.6(9) ms | α | $^{157}$Ta | 11/2− | | |
| $^{162}$Re | 75 | 87 | 161.97600(22)# | 107(13) ms | α (94%) | $^{158}$Ta | (2−) | | |
| $^{162}$Re | 75 | 87 | 161.97600(22)# | 107(13) ms | β$^+$ (6%) | $^{162}$W | (2−) | | |
| $^{162m}$Re | 173(10) keV | 173(10) keV | 173(10) keV | 77(9) ms | α (91%) | $^{158}$Ta | (9+) | | |
| $^{162m}$Re | 173(10) keV | 173(10) keV | 173(10) keV | 77(9) ms | β$^+$ (9%) | $^{162}$W | (9+) | | |
| $^{163}$Re | 75 | 88 | 162.972081(21) | 390(70) ms | β$^+$ (68%) | $^{163}$W | (1/2+) | | |
| $^{163}$Re | 75 | 88 | 162.972081(21) | 390(70) ms | α (32%) | $^{159}$Ta | (1/2+) | | |
| $^{163m}$Re | 115(4) keV | 115(4) keV | 115(4) keV | 214(5) ms | α (66%) | $^{159}$Ta | (11/2−) | | |
| $^{163m}$Re | 115(4) keV | 115(4) keV | 115(4) keV | 214(5) ms | β$^+$ (34%) | $^{163}$W | (11/2−) | | |
| $^{164}$Re | 75 | 89 | 163.97032(17)# | 0.53(23) s | α (58%) | $^{160}$Ta | high | | |
| $^{164}$Re | 75 | 89 | 163.97032(17)# | 0.53(23) s | β$^+$ (42%) | $^{164}$W | high | | |
| $^{164m}$Re | 120(120)# keV | 120(120)# keV | 120(120)# keV | 530(230) ms | | | (2#)− | | |
| $^{165}$Re | 75 | 90 | 164.967089(30) | 1# s | β$^+$ | $^{165}$W | 1/2+# | | |
| $^{165}$Re | 75 | 90 | 164.967089(30) | 1# s | α | $^{161}$Ta | 1/2+# | | |
| $^{165m}$Re | 47(26) keV | 47(26) keV | 47(26) keV | 2.1(3) s | β$^+$ (87%) | $^{165}$W | 11/2−# | | |
| $^{165m}$Re | 47(26) keV | 47(26) keV | 47(26) keV | 2.1(3) s | α (13%) | $^{161}$Ta | 11/2−# | | |
| $^{166}$Re | 75 | 91 | 165.96581(9)# | 2# s | β$^+$ | $^{166}$W | 2−# | | |
| $^{166}$Re | 75 | 91 | 165.96581(9)# | 2# s | α | $^{162}$Ta | 2−# | | |
| $^{167}$Re | 75 | 92 | 166.96260(6)# | 3.4(4) s | α | $^{163}$Ta | 9/2−# | | |
| $^{167}$Re | 75 | 92 | 166.96260(6)# | 3.4(4) s | β$^+$ | $^{167}$W | 9/2−# | | |
| $^{167m}$Re | 130(40)# keV | 130(40)# keV | 130(40)# keV | 5.9(3) s | β$^+$ (99.3%) | $^{167}$W | 1/2+# | | |
| $^{167m}$Re | 130(40)# keV | 130(40)# keV | 130(40)# keV | 5.9(3) s | α (.7%) | $^{163}$Ta | 1/2+# | | |
| $^{168}$Re | 75 | 93 | 167.96157(3) | 4.4(1) s | β$^+$ (99.99%) | $^{168}$W | (5+, 6+, 7+) | | |
| $^{168}$Re | 75 | 93 | 167.96157(3) | 4.4(1) s | α (.005%) | $^{164}$Ta | (5+, 6+, 7+) | | |
| $^{168m}$Re | non-exist | non-exist | non-exist | 6.6(15) s | | | | | |
| $^{169}$Re | 75 | 94 | 168.95879(3) | 8.1(5) s | β$^+$ (99.99%) | $^{169}$W | 9/2−# | | |
| $^{169}$Re | 75 | 94 | 168.95879(3) | 8.1(5) s | α (.005%) | $^{165}$Ta | 9/2−# | | |
| $^{169m}$Re | 145(29) keV | 145(29) keV | 145(29) keV | 15.1(15) s | β$^+$ (99.8%) | $^{169}$W | 1/2+# | | |
| $^{169m}$Re | 145(29) keV | 145(29) keV | 145(29) keV | 15.1(15) s | α (.2%) | $^{164}$Ta | 1/2+# | | |
| $^{170}$Re | 75 | 95 | 169.958220(28) | 9.2(2) s | β$^+$ (99.99%) | $^{170}$W | (5+) | | |
| $^{170}$Re | 75 | 95 | 169.958220(28) | 9.2(2) s | α (.01%) | $^{166}$Ta | (5+) | | |
| $^{171}$Re | 75 | 96 | 170.95572(3) | 15.2(4) s | β$^+$ | $^{171}$W | (9/2−) | | |
| $^{172}$Re | 75 | 97 | 171.95542(6) | 15(3) s | β$^+$ | $^{172}$W | (5) | | |
| $^{172m}$Re | 0(100)# keV | 0(100)# keV | 0(100)# keV | 55(5) s | β$^+$ | $^{172}$W | (2) | | |
| $^{173}$Re | 75 | 98 | 172.95324(3) | 1.98(26) min | β$^+$ | $^{173}$W | (5/2−) | | |
| $^{174}$Re | 75 | 99 | 173.95312(3) | 2.40(4) min | β$^+$ | $^{174}$W | | | |
| $^{175}$Re | 75 | 100 | 174.95138(3) | 5.89(5) min | β$^+$ | $^{175}$W | (5/2−) | | |
| $^{176}$Re | 75 | 101 | 175.95162(3) | 5.3(3) min | β$^+$ | $^{176}$W | 3+ | | |
| $^{177}$Re | 75 | 102 | 176.95033(3) | 14(1) min | β$^+$ | $^{177}$W | 5/2− | | |
| $^{177m}$Re | 84.71(10) keV | 84.71(10) keV | 84.71(10) keV | 50(10) μs | | | 5/2+ | | |
| $^{178}$Re | 75 | 103 | 177.95099(3) | 13.2(2) min | β$^+$ | $^{178}$W | (3+) | | |
| $^{179}$Re | 75 | 104 | 178.949988(26) | 19.5(1) min | β$^+$ | $^{179}$W | (5/2)+ | | |
| $^{179m1}$Re | 65.39(9) keV | 65.39(9) keV | 65.39(9) keV | 95(25) μs | | | (5/2−) | | |
| $^{179m2}$Re | 1684.59(14)+Y keV | 1684.59(14)+Y keV | 1684.59(14)+Y keV | >0.4 μs | | | (23/2+) | | |
| $^{180}$Re | 75 | 105 | 179.950789(23) | 2.44(6) min | β$^+$ | $^{180}$W | (1)− | | |
| $^{181}$Re | 75 | 106 | 180.950068(14) | 19.9(7) h | β$^+$ | $^{181}$W | 5/2+ | | |
| $^{182}$Re | 75 | 107 | 181.95121(11) | 64.0(5) h | β$^+$ | $^{182}$W | 7+ | | |
| $^{182m1}$Re | 60(100) keV | 60(100) keV | 60(100) keV | 12.7(2) h | β$^+$ | $^{182}$W | 2+ | | |
| $^{182m2}$Re | 235.736(10)+X keV | 235.736(10)+X keV | 235.736(10)+X keV | 585(21) ns | | | 2− | | |
| $^{182m3}$Re | 461.3(1)+X keV | 461.3(1)+X keV | 461.3(1)+X keV | 0.78(9) μs | | | (4−) | | |
| $^{183}$Re | 75 | 108 | 182.950820(9) | 70.0(14) d | EC | $^{183}$W | 5/2+ | | |
| $^{183m}$Re | 1907.6(3) keV | 1907.6(3) keV | 1907.6(3) keV | 1.04(4) ms | IT | $^{183}$Re | (25/2+) | | |
| $^{184}$Re | 75 | 109 | 183.952521(5) | 35.4(7) d | β$^+$ | $^{184}$W | 3(−) | | |
| $^{184m}$Re | 188.01(4) keV | 188.01(4) keV | 188.01(4) keV | 177.25(7) d | IT (75.4%) | $^{184}$Re | 8(+) | | |
| $^{184m}$Re | 188.01(4) keV | 188.01(4) keV | 188.01(4) keV | 177.25(7) d | β$^+$ (24.6%) | $^{184}$W | 8(+) | | |
| $^{185}$Re | 75 | 110 | 184.9529550(13) | Observationally Stable | Observationally Stable | Observationally Stable | 5/2+ | 0.3740(2) | |
| $^{185m}$Re | 2124(2) keV | 2124(2) keV | 2124(2) keV | 123(23) ns | | | (21/2) | | |
| $^{186}$Re | 75 | 111 | 185.9549861(13) | 3.7186(5) d | β$^−$ (93.1%) | $^{186}$Os | 1− | | |
| $^{186}$Re | 75 | 111 | 185.9549861(13) | 3.7186(5) d | EC (6.9%) | $^{186}$W | 1− | | |
| $^{186m}$Re | 149(7) keV | 149(7) keV | 149(7) keV | 2.0(5)×10$^5$ y | IT | $^{186}$Re | (8+) | | |
| $^{187}$Re | 75 | 112 | 186.9557531(15) | 4.12(2)×10$^{10}$ y | β$^−$ | $^{187}$Os | 5/2+ | 0.6260(2) | |
| $^{188}$Re | 75 | 113 | 187.9581144(15) | 17.0040(22) h | β$^−$ | $^{188}$Os | 1− | | |
| $^{188m}$Re | 172.069(9) keV | 172.069(9) keV | 172.069(9) keV | 18.59(4) min | IT | $^{188}$Re | (6)− | | |
| $^{189}$Re | 75 | 114 | 188.959229(9) | 24.3(4) h | β$^−$ | $^{189}$Os | 5/2+ | | |
| $^{190}$Re | 75 | 115 | 189.96182(16) | 3.1(3) min | β$^−$ | $^{190}$Os | (2)− | | |
| $^{190m}$Re | 210(50) keV | 210(50) keV | 210(50) keV | 3.2(2) h | β$^−$ (54.4%) | $^{190}$Os | (6−) | | |
| $^{190m}$Re | 210(50) keV | 210(50) keV | 210(50) keV | 3.2(2) h | IT (45.6%) | $^{190}$Re | (6−) | | |
| $^{191}$Re | 75 | 116 | 190.963125(11) | 9.8(5) min | β$^−$ | $^{191}$Os | (3/2+, 1/2+) | | |
| $^{192}$Re | 75 | 117 | 191.96596(21)# | 16(1) s | β$^−$ | $^{192}$Os | | | |
| $^{193}$Re | 75 | 118 | 192.96747(21)# | 30# s [>300 ns] | | | 5/2+# | | |
| $^{194}$Re | 75 | 119 | 193.97042(32)# | 2# s [>300 ns] | | | | | |
| This table header & footer: view ||||||||||
* ↑ $^m$Re – Excited nuclear isomer.
* ↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
* ↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
* ↑ Bold half-life – nearly stable, half-life longer than age of universe.
* 1 2 3 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
* ↑ Modes of decay: EC:Electron capture IT:Isomeric transition p:Proton emission
* ↑ Bold italics symbol as daughter – Daughter product is nearly stable.
* ↑ Bold symbol as daughter – Daughter product is stable.
* ↑ ( ) spin value – Indicates spin with weak assignment arguments.
* ↑ Believed to undergo α decay to $^{181}$Ta
* ↑ Theoretically capable of β$^−$ decay to $^{186}$Os
* ↑ primordial radionuclide
* ↑ Used in rhenium–osmium dating
* ↑ Can undergo Bound-state β$^−$ decay with a half-life of 32.9 years when fully ionized
* ↑ Theorized to also undergo α decay to $^{183}$Ta

## Rhenium-186

Rhenium-186 is a beta emitter and radiopharmaceutical that is used to treat glioblastoma, is used in theranostic medicine and has been reported to be used in synoviorthesis.