Isotopes of rhenium

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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

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

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  • Isotope masses from:
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  • Isotopic compositions and standard atomic masses from:
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  • Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
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Isotopes of tungsten Isotopes of rhenium Isotopes of osmium
Table of nuclides
Isotopes of the chemical elements
1
H		 2
He
3
Li		 4
Be		 5
B		 6
C		 7
N		 8
O		 9
F		 10
Ne
11
Na		 12
Mg		 13
Al		 14
Si		 15
P		 16
S		 17
Cl		 18
Ar
19
K		 20
Ca		 21
Sc		 22
Ti		 23
V		 24
Cr		 25
Mn		 26
Fe		 27
Co		 28
Ni		 29
Cu		 30
Zn		 31
Ga		 32
Ge		 33
As		 34
Se		 35
Br		 36
Kr
37
Rb		 38
Sr		 39
Y		 40
Zr		 41
Nb		 42
Mo		 43
Tc		 44
Ru		 45
Rh		 46
Pd		 47
Ag		 48
Cd		 49
In		 50
Sn		 51
Sb		 52
Te		 53
I		 54
Xe
55
Cs		 56
Ba		 1 asterisk 72
Hf		 73
Ta		 74
W		 75
Re		 76
Os		 77
Ir		 78
Pt		 79
Au		 80
Hg		 81
Tl		 82
Pb		 83
Bi		 84
Po		 85
At		 86
Rn
87
Fr		 88
Ra		 2 asterisks 104
Rf		 105
Db		 106
Sg		 107
Bh		 108
Hs		 109
Mt		 110
Ds		 111
Rg		 112
Cn		 113
Uut		 114
Fl		 115
Uup		 116
Lv		 117
Uus		 118
Uuo
1 asterisk 57
La		 58
Ce		 59
Pr		 60
Nd		 61
Pm		 62
Sm		 63
Eu		 64
Gd		 65
Tb		 66
Dy		 67
Ho		 68
Er		 69
Tm		 70
Yb		 71
Lu
2 asterisks 89
Ac		 90
Th		 91
Pa		 92
U		 93
Np		 94
Pu		 95
Am		 96
Cm		 97
Bk		 98
Cf		 99
Es		 100
Fm		 101
Md		 102
No		 103
Lr
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