Isotopes of erbium

Template:Short description Template:Infobox erbium isotopes Naturally occurring erbium (₆₈Er) is composed of six stable isotopes, with ¹⁶⁶Er being the most abundant (33.503% natural abundance). Thirty-nine radioisotopes have been characterized with between 74 and 112 neutrons, or 142 to 180 nucleons, with the most stable being ¹⁶⁹Er with a half-life of 9.4 days, ¹⁷²Er with a half-life of 49.3 hours, ¹⁶⁰Er with a half-life of 28.58 hours, ¹⁶⁵Er with a half-life of 10.36 hours, and ¹⁷¹Er with a half-life of 7.516 hours. All of the remaining radioactive isotopes have half-lives that are less than 3.5 hours, and the majority of these have half-lives that are less than 4 minutes. This element also has numerous meta states, with the most stable being ^167mEr (t_1/2 = 2.269 seconds).

The isotopes of erbium range in atomic weight from (¹⁴²Er) to (¹⁸⁰Er). The primary decay mode before the most abundant stable isotope, ¹⁶⁶Er, is electron capture, and the primary mode after is beta decay. The primary decay products before ¹⁶⁶Er are holmium isotopes, and the primary products after are thulium isotopes. All isotopes of erbium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

List of isotopes

Template:Isotopes table |-id=Erbium-143 | ¹⁴³Er | style="text-align:right" | 68 | style="text-align:right" | 75 | 142.96655(43)# | 200# ms | | | 9/2−# | | |-id=Erbium-144 | ¹⁴⁴Er | style="text-align:right" | 68 | style="text-align:right" | 76 | 143.96070(21)# | 400# ms[> 200 ns] | | | 0+ | | |-id=Erbium-145 | rowspan=2| ¹⁴⁵Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 77 | rowspan=2| 144.95787(22)# | rowspan=2| 900(200) ms | β⁺ | ¹⁴⁵Ho | rowspan=2|1/2+# | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁴Dy |-id=Erbium-145m | rowspan=2 style="text-indent:1em" | ^145mEr | rowspan=2 colspan="3" style="text-indent:2em" | 205(4)# keV | rowspan=2| 1.0(3) s | β⁺ | ¹⁴⁵Ho | rowspan=2| (11/2-) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁴Dy |-id=Erbium-146 | rowspan=2|¹⁴⁶Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 78 | rowspan=2|145.952418(7) | rowspan=2|1.7(6) s | β⁺ | ¹⁴⁶Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁵Dy |-id=Erbium-147 | rowspan=2|¹⁴⁷Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 79 | rowspan=2|146.94996(4)# | rowspan=2|3.2(12) s | β⁺ | ¹⁴⁷Ho | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁶Dy |-id=Erbium-147m | rowspan=2 style="text-indent:1em" | ^147mEr | rowspan=2 colspan="3" style="text-indent:2em" | 100(50)# keV | rowspan=2| 1.6(2) s | β⁺ | ¹⁴⁷Ho | rowspan=2| (11/2−) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁶Dy |-id=Erbium-148 | rowspan=2|¹⁴⁸Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 80 | rowspan=2|147.944735(11)# | rowspan=2|4.6(2) s | β⁺ (99.85%) | ¹⁴⁸Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p (0.15%) | ¹⁴⁷Dy |-id=Erbium-148m | style="text-indent:1em" | ^148mEr | colspan="3" style="text-indent:2em" | 2.9132(4) MeV | 13(3) μs | IT | ¹⁴⁸Er | (10+) | | |-id=Erbium-149 | rowspan=2|¹⁴⁹Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 81 | rowspan=2|148.94231(3) | rowspan=2|4(2) s | β⁺ (93%) | ¹⁴⁹Ho | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (7%) | ¹⁴⁸Dy |-id=Erbium-149m1 | rowspan=3 style="text-indent:1em" | ^149m1Er | rowspan=3 colspan="3" style="text-indent:2em" | 741.8(2) keV | rowspan=3|8.9(2) s | β⁺ (96.3%) | ¹⁴⁹Ho | rowspan=3|(11/2−) | rowspan=3| | rowspan=3| |- | IT (3.5%) | ¹⁴⁹Er |- | β⁺, p (0.18%) | ¹⁴⁸Dy |-id=Erbium-149m2 | style="text-indent:1em" | ^149m2Er | colspan="3" style="text-indent:2em" | 2.6111(3) MeV | 0.61(8) μs | IT | ¹⁴⁹Er | (19/2+) | | |-id=Erbium-149m3 | style="text-indent:1em" | ^149m3Er | colspan="3" style="text-indent:2em" | 3.302(7) MeV | 4.8(1) μs | IT | ¹⁴⁹Er | (27/2−) | | |-id=Erbium-150 | ¹⁵⁰Er | style="text-align:right" | 68 | style="text-align:right" | 82 | 149.937916(18) | 18.5(7) s | β⁺ | ¹⁵⁰Ho | 0+ | | |-id=Erbium-150m | style="text-indent:1em" | ^150mEr | colspan="3" style="text-indent:2em" | 2.7965(5) MeV | 2.55(10) μs | IT | ¹⁵⁰Er | 10+ | | |-id=Erbium-151 | ¹⁵¹Er | style="text-align:right" | 68 | style="text-align:right" | 83 | 150.937449(18) | 23.5(20) s | β⁺ | ¹⁵¹Ho | (7/2−) | | |-id=Erbium-151m1 | rowspan=2 style="text-indent:1em" | ^151m1Er | rowspan=2 colspan="3" style="text-indent:2em" | 2.5860(5) MeV | rowspan=2|580(20) ms | IT (95.3%) | ¹⁵¹Er | rowspan=2|(27/2−) | rowspan=2| | rowspan=2| |- | β⁺ (4.7%) | ¹⁵¹Ho |-id=Erbium-151m2 | style="text-indent:1em" | ^151m2Er | colspan="3" style="text-indent:2em" | 10.2866(10) MeV | 0.42(5) μs | IT | ¹⁵¹Er | (65/2-, 61/2+) | | |-id=Erbium-152 | rowspan=2|¹⁵²Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 84 | rowspan=2|151.935050(9) | rowspan=2|10.3(1) s | α (90%) | ¹⁴⁸Dy | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ (10%) | ¹⁵²Ho |-id=Erbium-153 | rowspan=2|¹⁵³Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 85 | rowspan=2|152.935086(10) | rowspan=2|37.1(2) s | α (53%) | ¹⁴⁹Dy | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | β⁺ (47%) | ¹⁵³Ho |-id=Erbium-153m1 | style="text-indent:1em" | ^153m1Er | colspan="3" style="text-indent:2em" | 2.7982(10) MeV | 373(9) ns | IT | ¹⁵³Er | (27/2-) | | |-id=Erbium-153m2 | style="text-indent:1em" | ^153m2Er | colspan="3" style="text-indent:2em" | 5.2481(10) MeV | 248(32) ns | IT | ¹⁵³Er | (41/2-) | | |-id=Erbium-154 | rowspan=2|¹⁵⁴Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 86 | rowspan=2|153.932791(5) | rowspan=2|3.73(9) min | β⁺ (99.53%) | ¹⁵⁴Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.47%) | ¹⁵⁰Dy |-id=Erbium-155 | rowspan=2|¹⁵⁵Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 87 | rowspan=2|154.933216(7) | rowspan=2|5.3(3) min | β⁺ (99.978%) | ¹⁵⁵Ho | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | α (0.022%) | ¹⁵¹Dy |-id=Erbium-156 | rowspan=2| ¹⁵⁶Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 88 | rowspan=2| 155.931066(26) | rowspan=2| 19.5(10) min | β⁺ | ¹⁵⁶Ho | rowspan=2| 0+ | rowspan=2| | rowspan=2| |- | α (1.2Template:E%) | ¹⁵²Dy |-id=Erbium-157 | ¹⁵⁷Er | style="text-align:right" | 68 | style="text-align:right" | 89 | 156.931923(28) | 18.65(10) min | β⁺ | ¹⁵⁷Ho | 3/2− | | |-id=Erbium-157m | style="text-indent:1em" | ^157mEr | colspan="3" style="text-indent:2em" | 155.4(3) keV | 76(6) ms | IT | ¹⁵⁷Er | 9/2+ | | |-id=Erbium-158 | ¹⁵⁸Er | style="text-align:right" | 68 | style="text-align:right" | 90 | 157.929893(27) | 2.29(6) h | EC | ¹⁵⁸Ho | 0+ | | |-id=Erbium-159 | ¹⁵⁹Er | style="text-align:right" | 68 | style="text-align:right" | 91 | 158.930691(4) | 36(1) min | β⁺ | ¹⁵⁹Ho | 3/2− | | |-id=Erbium-159m1 | style="text-indent:1em" | ^159m1Er | colspan="3" style="text-indent:2em" | 182.602(24) keV | 337(14) ns | IT | ¹⁵⁹Er | 9/2+ | | |-id=Erbium-159m2 | style="text-indent:1em" | ^159m2Er | colspan="3" style="text-indent:2em" | 429.05(3) keV | 590(60) ns | IT | ¹⁵⁹Er | 11/2− | | |-id=Erbium-160 | ¹⁶⁰Er | style="text-align:right" | 68 | style="text-align:right" | 92 | 159.929077(26) | 28.58(9) h | EC | ¹⁶⁰Ho | 0+ | | |-id=Erbium-161 | ¹⁶¹Er | style="text-align:right" | 68 | style="text-align:right" | 93 | 160.930004(9) | 3.21(3) h | β⁺ | ¹⁶¹Ho | 3/2− | | |-id=Erbium-161m | style="text-indent:1em" | ^161mEr | colspan="3" style="text-indent:2em" | 396.44(4) keV | 7.5(7) μs | IT | ¹⁶¹Er | 11/2− | | |-id=Erbium-162 | ¹⁶²Er | style="text-align:right" | 68 | style="text-align:right" | 94 | 161.9287873(8) | colspan=3 align=center|Observationally Stable | 0+ | 0.00139(5) | |-id=Erbium-162m | style="text-indent:1em" | ^162mEr | colspan="3" style="text-indent:2em" | 2.02601(13) MeV | 88(16) ns | IT | ¹⁶²Er | 7(-) | | |-id=Erbium-163 | ¹⁶³Er | style="text-align:right" | 68 | style="text-align:right" | 95 | 162.930040(5) | 75.0(4) min | β⁺ | ¹⁶³Ho | 5/2− | | |-id=Erbium-163m | style="text-indent:1em" | ^163mEr | colspan="3" style="text-indent:2em" | 445.5(6) keV | 580(100) ns | IT | ¹⁶³Er | (11/2−) | | |-id=Erbium-164 | ¹⁶⁴Er | style="text-align:right" | 68 | style="text-align:right" | 96 | 163.9292077(8) | colspan=3 align=center|Observationally Stable | 0+ | 0.01601(3) | |-id=Erbium-165 | ¹⁶⁵Er | style="text-align:right" | 68 | style="text-align:right" | 97 | 164.9307335(10) | 10.36(4) h | EC | ¹⁶⁵Ho | 5/2− | | |-id=Erbium-165m1 | style="text-indent:1em" | ^165m1Er | colspan="3" style="text-indent:2em" | 551.3(6) keV | 250(30) ns | IT | ¹⁶⁵Er | 11/2- | | |-id=Erbium-165m2 | style="text-indent:1em" | ^165m2Er | colspan="3" style="text-indent:2em" | 1.8230(6) MeV | 370(40) ns | IT | ¹⁶⁵Er | (19/2) | | |-id=Erbium-166 | ¹⁶⁶Er | style="text-align:right" | 68 | style="text-align:right" | 98 | 165.9303011(4) | colspan=3 align=center|Observationally Stable | 0+ | 0.33503(36) | |-id=Erbium-167 | ¹⁶⁷Er | style="text-align:right" | 68 | style="text-align:right" | 99 | 166.9320562(3) | colspan=3 align=center|Observationally Stable | 7/2+ | 0.22869(9) | |-id=Erbium-167m | style="text-indent:1em" | ^167mEr | colspan="3" style="text-indent:2em" | 207.801(5) keV | 2.269(6) s | IT | ¹⁶⁷Er | 1/2− | | |-id=Erbium-168 | ¹⁶⁸Er | style="text-align:right" | 68 | style="text-align:right" | 100 | 167.93237828(28) | colspan=3 align=center|Observationally Stable | 0+ | 0.26978(18) | |-id=Erbium-168m | style="text-indent:1em" | ^168mEr | colspan="3" style="text-indent:2em" | 1.0940383(16) MeV | 109.0(7) ns | IT | ¹⁶⁸Er | 4- | | |-id=Erbium-169 | ¹⁶⁹Er | style="text-align:right" | 68 | style="text-align:right" | 101 | 168.9345984(3) | 9.392(18) d | β⁻ | ¹⁶⁹Tm | 1/2− | | |-id=Erbium-169m1 | style="text-indent:1em" | ^169m1Er | colspan="3" style="text-indent:2em" | 92.05(10) keV | 285(20) ns | IT | ¹⁶⁹Er | (5/2)- | | |-id=Erbium-169m2 | style="text-indent:1em" | ^169m2Er | colspan="3" style="text-indent:2em" | 243.69(17) keV | 200(10) ns | IT | ¹⁶⁹Er | 7/2+ | | |-id=Erbium-170 | ¹⁷⁰Er | style="text-align:right" | 68 | style="text-align:right" | 102 | 169.9354719(15) | colspan=3 align=center|Observationally Stable | 0+ | 0.14910(36) | |-id=Erbium-171 | ¹⁷¹Er | style="text-align:right" | 68 | style="text-align:right" | 103 | 170.93803746(15) | 7.516(2) h | β⁻ | ¹⁷¹Tm | 5/2− | | |-id=Erbium-171m | style="text-indent:1em" | ^171mEr | colspan="3" style="text-indent:2em" | 198.61(9) keV | 210(10) ns | IT | ¹⁷¹Er | 1/2− | | |-id=Erbium-172 | ¹⁷²Er | style="text-align:right" | 68 | style="text-align:right" | 104 | 171.939363(4) | 49.3(5) h | β⁻ | ¹⁷²Tm | 0+ | | |- |-id=Erbium-172m | style="text-indent:1em" | ^172mEr | colspan="3" style="text-indent:2em" | 1.5009(3) MeV | 579(62) ns | IT | ¹⁷²Er | (6+) | | |-id=Erbium-173 | ¹⁷³Er | style="text-align:right" | 68 | style="text-align:right" | 105 | 172.94240(21)# | 1.434(17) min | β⁻ | ¹⁷³Tm | (7/2−) | | |-id=Erbium-174 | ¹⁷⁴Er | style="text-align:right" | 68 | style="text-align:right" | 106 | 173.94423(32)# | 3.2(2) min | β⁻ | ¹⁷⁴Tm | 0+ | | |-id=Erbium-174m | style="text-indent:1em" | ^174mEr | colspan="3" style="text-indent:2em" | 1.1115(7) MeV | 3.9(3) s | IT | ¹⁷⁴Er | 8- | | |-id=Erbium-175 | ¹⁷⁵Er | style="text-align:right" | 68 | style="text-align:right" | 107 | 174.94777(43)# | 1.2(3) min | β⁻ | ¹⁷⁵Tm | 9/2+# | | |-id=Erbium-176 | ¹⁷⁶Er | style="text-align:right" | 68 | style="text-align:right" | 108 | 175.94994(43)# | 12# s[>300 ns] | | | 0+ | | |-id=Erbium-177 | ¹⁷⁷Er | style="text-align:right" | 68 | style="text-align:right" | 109 | 176.95399(54)# | 8# s[>300 ns] | | | 1/2−# | | |-id=Erbium-178 | ¹⁷⁸Er | style="text-align:right" | 68 | style="text-align:right" | 110 | 177.95678(64)# | 4# s[>300 ns] | | | 0+ | | |-id=Erbium-179 | ¹⁷⁹Er | style="text-align:right" | 68 | style="text-align:right" | 111 | 178.96127(54)# | 3# s[>550 ns)] | | | 3/2−# | | |-id=Erbium-180 | ¹⁸⁰Er | style="text-align:right" | 68 | style="text-align:right" | 112 | 179.96438(54)# | 2# s[>550 ns] | | | 0+ | | Template:Isotopes table/footer

See also

Daughter products other than erbium

• Isotopes of thulium
• Isotopes of holmium
• Isotopes of dysprosium

References

• Isotope masses from:
  • Template:AME2020 II
• Isotopic compositions and standard atomic masses from:
  • Template:NUBASE2020
  • Template:CIAAW2003
  • Template:CIAAW 2005
• Half-life, spin, and isomer data selected from the following sources.
  • Template:NUBASE2020
  • Template:NNDC
  • Template:CRC85