Isotopes of rhenium

Naturally occurring rhenium (Re) is 37.4% 185Re, which is stable, and 62.6% 187Re, which is unstable but has a very long half-life (41.2×109 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 33 other unstable isotopes recognized, the longest-lived of which are 183Re with a half-life of 70 days, 184Re with a half-life of 38 days, 186Re with a half-life of 3.7186 days, 182Re with a half-life of 64.0 hours, and 189Re with a half-life of 24.3 hours. There are also numerous isomers, the longest-lived of which are 186mRe with a half-life of 200,000 years and 184mRe with a half-life of 169 days. All others have half-lives less than a day.

Relative atomic mass: 186.207(1).

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life[n 1] decay
mode(s)[1][n 2]
daughter
isotope(s)[n 3]
nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
160Re 75 85 159.98212(43)# 860(120) µs
[0.82(+15−9) ms]
p (91%) 159W (2−)
α (9%) 156Ta
161Re 75 86 160.97759(22) 0.37(4) ms p 160W 1/2+
161mRe 123.8(13) keV 15.6(9) ms α 157Ta 11/2−
162Re 75 87 161.97600(22)# 107(13) ms α (94%) 158Ta (2−)
β+ (6%) 162W
162mRe 173(10) keV 77(9) ms α (91%) 158Ta (9+)
β+ (9%) 162W
163Re 75 88 162.972081(21) 390(70) ms β+ (68%) 163W (1/2+)
α (32%) 159Ta
163mRe 115(4) keV 214(5) ms α (66%) 159Ta (11/2−)
β+ (34%) 163W
164Re 75 89 163.97032(17)# 0.53(23) s α (58%) 160Ta high
β+ (42%) 164W
164mRe 120(120)# keV 530(230) ms (2#)−
165Re 75 90 164.967089(30) 1# s β+ 165W 1/2+#
α 161Ta
165mRe 47(26) keV 2.1(3) s β+ (87%) 165W 11/2−#
α (13%) 161Ta
166Re 75 91 165.96581(9)# 2# s β+ 166W 2−#
α 162Ta
167Re 75 92 166.96260(6)# 3.4(4) s α 163Ta 9/2−#
β+ 167W
167mRe 130(40)# keV 5.9(3) s β+ (99.3%) 167W 1/2+#
α (.7%) 163Ta
168Re 75 93 167.96157(3) 4.4(1) s β+ (99.99%) 168W (5+,6+,7+)
α (.005%) 164Ta
168mRe non-exist 6.6(15) s
169Re 75 94 168.95879(3) 8.1(5) s β+ (99.99%) 169W 9/2−#
α (.005%) 165Ta
169mRe 145(29) keV 15.1(15) s β+ (99.8%) 169W 1/2+#
α (.2%) 164Ta
170Re 75 95 169.958220(28) 9.2(2) s β+ (99.99%) 170W (5+)
α (.01%) 166Ta
171Re 75 96 170.95572(3) 15.2(4) s β+ 171W (9/2−)
172Re 75 97 171.95542(6) 15(3) s β+ 172W (5)
172mRe 0(100)# keV 55(5) s β+ 172W (2)
173Re 75 98 172.95324(3) 1.98(26) min β+ 173W (5/2−)
174Re 75 99 173.95312(3) 2.40(4) min β+ 174W
175Re 75 100 174.95138(3) 5.89(5) min β+ 175W (5/2−)
176Re 75 101 175.95162(3) 5.3(3) min β+ 176W 3+
177Re 75 102 176.95033(3) 14(1) min β+ 177W 5/2−
177mRe 84.71(10) keV 50(10) µs 5/2+
178Re 75 103 177.95099(3) 13.2(2) min β+ 178W (3+)
179Re 75 104 178.949988(26) 19.5(1) min β+ 179W (5/2)+
179m1Re 65.39(9) keV 95(25) µs (5/2−)
179m2Re 1684.59(14)+Y keV >0.4 µs (23/2+)
180Re 75 105 179.950789(23) 2.44(6) min β+ 180W (1)−
181Re 75 106 180.950068(14) 19.9(7) h β+ 181W 5/2+
182Re 75 107 181.95121(11) 64.0(5) h β+ 182W 7+
182m1Re 60(100) keV 12.7(2) h β+ 182W 2+
182m2Re 235.736(10)+X keV 585(21) ns 2−
182m3Re 461.3(1)+X keV 0.78(9) µs (4−)
183Re 75 108 182.950820(9) 70.0(14) d EC 183W 5/2+
183mRe 1907.6(3) keV 1.04(4) ms IT 183Re (25/2+)
184Re 75 109 183.952521(5) 38.0(5) d β+ 184W 3(−)
184mRe 188.01(4) keV 169(8) d IT (75.4%) 184Re 8(+)
β+ (24.6%) 184W
185Re 75 110 184.9529550(13) Observationally Stable[n 4] 5/2+ 0.3740(2)
185mRe 2124(2) keV 123(23) ns (21/2)
186Re 75 111 185.9549861(13) 3.7186(5) d β (93.1%) 186Os 1−
EC (6.9%) 186W
186mRe 149(7) keV 2.0(5)×105 y IT (90%) 186Re (8+)
β (10%) 186Os
187Re[n 5][n 6] 75 112 186.9557531(15) 41.2(2)×109 y[n 7] β (99.99%) 187Os 5/2+ 0.6260(2)
α (10−4%) 183Ta
188Re 75 113 187.9581144(15) 17.0040(22) h β 188Os 1−
188mRe 172.069(9) keV 18.59(4) min IT 188Re (6)−
189Re 75 114 188.959229(9) 24.3(4) h β 189Os 5/2+
190Re 75 115 189.96182(16) 3.1(3) min β 190Os (2)−
190mRe 210(50) keV 3.2(2) h β (54.4%) 190Os (6−)
IT (45.6%) 190Re
191Re 75 116 190.963125(11) 9.8(5) min β 191Os (3/2+,1/2+)
192Re 75 117 191.96596(21)# 16(1) s β 192Os
193Re 75 118 192.96747(21)# 30# s [>300 ns] 5/2+#
194Re 75 119 193.97042(32)# 2# s [>300 ns]
  1. Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
  2. Abbreviations:
    EC: Electron capture
    IT: Isomeric transition
  3. Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
  4. Believed to undergo α decay to 181Ta
  5. primordial radionuclide
  6. Used in rhenium-osmium dating
  7. Can undergo Bound-state β decay with a half-life of 33 years when fully ionized

Notes

References

  1. "Universal Nuclide Chart". nucleonica. (registration required (help)).
Isotopes of tungsten Isotopes of rhenium Isotopes of osmium
Table of nuclides
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