# Isotopen van holmium

Het chemisch element holmium (Ho), met een atoommassa van 164,93032(2) u, bezit 1 stabiele isotoop: $^{165}$Ho, die ervan verdacht wordt om via α-verval te vervallen tot de radio-isotoop $^{161}$Tb. Het is tevens de enige in de natuur voorkomende isotoop van dit element, waardoor het valt onder de mononuclidische elementen. De 34 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde).
De kortstlevende isotoop van holmium is $^{141}$Ho, met een halfwaardetijd van ongeveer 4,1 milliseconden. De langstlevende is $^{163}$Ho, met een halfwaardetijd van 4570 jaar.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{140}$Ho | 67 | 73 | 139,96854(54) | 6(3) ms | | | 8$^+$ | |
| $^{141}$Ho | 67 | 74 | 140,96310(54) | 4,1(3) ms | | | (7/2$^−$) | |
| $^{141m}$Ho | 66(2) keV | 66(2) keV | 66(2) keV | 6,4(8) µs | | | (1/2$^+$) | |
| $^{142}$Ho | 67 | 75 | 141,95977(54) | 400(100) ms | β$^+$ | $^{142}$Dy | (6 tot 9) | |
| $^{142}$Ho | 67 | 75 | 141,95977(54) | 400(100) ms | p | $^{141}$Dy | (6 tot 9) | |
| $^{143}$Ho | 67 | 76 | 142,95461(43) | 300 ms [> 200 ns] | β$^+$ | $^{143}$Dy | 11/2$^−$ | |
| $^{144}$Ho | 67 | 77 | 143,95148(32) | 0,7(1) s | β$^+$ | $^{144}$Dy | | |
| $^{144}$Ho | 67 | 77 | 143,95148(32) | 0,7(1) s | β$^+$, p | $^{143}$Tb | | |
| $^{145}$Ho | 67 | 78 | 144,94720(32) | 2,4(1) s | β$^+$ | $^{145}$Dy | (11/2$^−$) | |
| $^{145m}$Ho | 100(100) keV | 100(100) keV | 100(100) keV | 100 ms | | | 5/2$^+$ | |
| $^{146}$Ho | 67 | 79 | 145,94464(21) | 3,6(3) s | β$^+$ | $^{146}$Dy | (10$^+$) | |
| $^{146}$Ho | 67 | 79 | 145,94464(21) | 3,6(3) s | β$^+$, p (zelden) | $^{145}$Tb | (10$^+$) | |
| $^{147}$Ho | 67 | 80 | 146,94006(3) | 5,8(4) s | β$^+$ | $^{147}$Dy | (11/2$^−$) | |
| $^{147}$Ho | 67 | 80 | 146,94006(3) | 5,8(4) s | β$^+$, p (zelden) | $^{146}$Tb | (11/2$^−$) | |
| $^{148}$Ho | 67 | 81 | 147,93772(14) | 2,2(11) s | β$^+$ | $^{148}$Dy | (1$^+$) | |
| $^{148m1}$Ho | 400(100) keV | 400(100) keV | 400(100) keV | 9,49(12) s | β$^+$ (99,92%) | $^{148}$Dy | 6$^−$ | |
| $^{148m1}$Ho | 400(100) keV | 400(100) keV | 400(100) keV | 9,49(12) s | β$^+$, p (0,08%) | $^{147}$Tb | 6$^−$ | |
| $^{148m2}$Ho | 690(100) keV | 690(100) keV | 690(100) keV | 2,35(4) ms | | | (10$^+$) | |
| $^{149}$Ho | 67 | 82 | 148,933775(20) | 21,1(2) s | β$^+$ | $^{149}$Dy | (11/2$^−$) | |
| $^{149m1}$Ho | 48,80(20) keV | 48,80(20) keV | 48,80(20) keV | 56(3) s | β$^+$ | $^{149}$Dy | (1/2$^+$) | |
| $^{149m2}$Ho | 7200(350) keV | 7200(350) keV | 7200(350) keV | > 100 ns | | | | |
| $^{150}$Ho | 67 | 83 | 149,933496(15) | 76,8(18) s | β$^+$ | $^{150}$Dy | 2$^−$ | |
| $^{150m1}$Ho | −10(50) keV | −10(50) keV | −10(50) keV | 23,3(3) s | β$^+$ | $^{150}$Dy | 9$^+$ | |
| $^{150m2}$Ho | ± 8000 keV | ± 8000 keV | ± 8000 keV | 751 ns | | | | |
| $^{151}$Ho | 67 | 84 | 150,931688(13) | 35,2(1) s | β$^+$ (78%) | $^{151}$Dy | 11/2$^−$ | |
| $^{151}$Ho | 67 | 84 | 150,931688(13) | 35,2(1) s | α (22%) | $^{147}$Tb | 11/2$^−$ | |
| $^{151m}$Ho | 41,0(2) keV | 41,0(2) keV | 41,0(2) keV | 47,2(10) s | α (77%) | $^{147}$Tb | 1/2$^+$ | |
| $^{151m}$Ho | 41,0(2) keV | 41,0(2) keV | 41,0(2) keV | 47,2(10) s | β$^+$ (22%) | $^{151}$Dy | 1/2$^+$ | |
| $^{152}$Ho | 67 | 85 | 151,931714(15) | 161,8(3) s | β$^+$ (88%) | $^{152}$Dy | 2$^−$ | |
| $^{152}$Ho | 67 | 85 | 151,931714(15) | 161,8(3) s | α (12%) | $^{148}$Tb | 2$^−$ | |
| $^{152m1}$Ho | 160(1) keV | 160(1) keV | 160(1) keV | 50,0(4) s | | | 9$^+$ | |
| $^{152m2}$Ho | 3019,59(19) keV | 3019,59(19) keV | 3019,59(19) keV | 8,4(3) µs | | | 19$^−$ | |
| $^{153}$Ho | 67 | 86 | 152,930199(6) | 2,01(3) min | β$^+$ (99,94%) | $^{153}$Dy | 11/2$^−$ | |
| $^{153}$Ho | 67 | 86 | 152,930199(6) | 2,01(3) min | α (0,05%) | $^{149}$Tb | 11/2$^−$ | |
| $^{153m1}$Ho | 68,7(3) keV | 68,7(3) keV | 68,7(3) keV | 9,3(5) min | β$^+$ (99,82%) | $^{153}$Dy | 1/2$^+$ | |
| $^{153m1}$Ho | 68,7(3) keV | 68,7(3) keV | 68,7(3) keV | 9,3(5) min | α (0,18%) | $^{149}$Tb | 1/2$^+$ | |
| $^{153m2}$Ho | 2772 keV | 2772 keV | 2772 keV | 229(2) ns | | | (31/2$^+$) | |
| $^{154}$Ho | 67 | 87 | 153,930602(9) | 11,76(19) min | β$^+$ (99,98%) | $^{154}$Dy | 2$^−$ | |
| $^{154}$Ho | 67 | 87 | 153,930602(9) | 11,76(19) min | α (0,02%) | $^{150}$Tb | 2$^−$ | |
| $^{154m}$Ho | 238(30) keV | 238(30) keV | 238(30) keV | 3,10(14) min | β$^+$ (99,99%) | $^{154}$Dy | 8$^+$ | |
| $^{154m}$Ho | 238(30) keV | 238(30) keV | 238(30) keV | 3,10(14) min | α (0,001%) | $^{150}$Tb | 8$^+$ | |
| $^{154m}$Ho | 238(30) keV | 238(30) keV | 238(30) keV | 3,10(14) min | IT (zelden) | $^{154}$Ho | 8$^+$ | |
| $^{155}$Ho | 67 | 88 | 154,929103(19) | 48(1) min | β$^+$ | $^{155}$Dy | 5/2$^+$ | |
| $^{155m}$Ho | 141,97(11) keV | 141,97(11) keV | 141,97(11) keV | 880(80) µs | | | 11/2$^−$ | |
| $^{156}$Ho | 67 | 89 | 155,92984(5) | 56(1) min | β$^+$ | $^{156}$Dy | 4$^−$ | |
| $^{156m1}$Ho | 100(50) keV | 100(50) keV | 100(50) keV | 7,8(3) min | β$^+$ | $^{156}$Dy | (9$^+$) | |
| $^{156m1}$Ho | 100(50) keV | 100(50) keV | 100(50) keV | 7,8(3) min | IT | $^{156}$Ho | (9$^+$) | |
| $^{156m2}$Ho | 52,4(5) keV | 52,4(5) keV | 52,4(5) keV | 9,5(15) s | | | 1$^−$ | |
| $^{157}$Ho | 67 | 90 | 156,928256(26) | 12,6(2) min | β$^+$ | $^{157}$Dy | 7/2$^−$ | |
| $^{158}$Ho | 67 | 91 | 157,928941(29) | 11,3(4) min | β$^+$ (93%) | $^{158}$Dy | 5$^+$ | |
| $^{158}$Ho | 67 | 91 | 157,928941(29) | 11,3(4) min | α (7%) | $^{154}$Tb | 5$^+$ | |
| $^{158m1}$Ho | 67,200(10) keV | 67,200(10) keV | 67,200(10) keV | 28(2) min | IT (81%) | $^{158}$Ho | 2$^−$ | |
| $^{158m1}$Ho | 67,200(10) keV | 67,200(10) keV | 67,200(10) keV | 28(2) min | β$^+$ (19%) | $^{158}$Dy | 2$^−$ | |
| $^{158m2}$Ho | 180(70) keV | 180(70) keV | 180(70) keV | 21,3(23) min | | | (9$^+$) | |
| $^{159}$Ho | 67 | 92 | 158,927712(4) | 33,05(11) min | β$^+$ | $^{159}$Dy | 7/2$^−$ | |
| $^{159m}$Ho | 205,91(5) keV | 205,91(5) keV | 205,91(5) keV | 8,30(8) s | IT | $^{159}$Ho | 1/2$^+$ | |
| $^{160}$Ho | 67 | 93 | 159,928729(16) | 25,6(3) min | β$^+$ | $^{160}$Dy | 5$^+$ | |
| $^{160m1}$Ho | 59,98(3) keV | 59,98(3) keV | 59,98(3) keV | 5,02(5) uur | IT (65%) | $^{160}$Ho | 2$^−$ | |
| $^{160m1}$Ho | 59,98(3) keV | 59,98(3) keV | 59,98(3) keV | 5,02(5) uur | β$^+$ (35%) | $^{160}$Dy | 2$^−$ | |
| $^{160m2}$Ho | 197(16) keV | 197(16) keV | 197(16) keV | 3 s | | | (9$^+$) | |
| $^{161}$Ho | 67 | 94 | 160,927855(3) | 2,48(5) uur | EV | $^{161}$Dy | 7/2$^−$ | |
| $^{161m}$Ho | 211,16(3) keV | 211,16(3) keV | 211,16(3) keV | 6,76(7) s | IT | $^{161}$Ho | 1/2$^+$ | |
| $^{162}$Ho | 67 | 95 | 161,929096(4) | 15,0(10) min | β$^+$ | $^{162}$Dy | 1$^+$ | |
| $^{162m}$Ho | 106(7) keV | 106(7) keV | 106(7) keV | 67,0(7) min | IT (62%) | $^{162}$Ho | 6$^−$ | |
| $^{162m}$Ho | 106(7) keV | 106(7) keV | 106(7) keV | 67,0(7) min | β$^+$ (38%) | $^{162}$Dy | 6$^−$ | |
| $^{163}$Ho | 67 | 96 | 162,9287339(27) | 4570(25) jaar | EV | $^{163}$Dy | 7/2$^−$ | |
| $^{163m}$Ho | 297,88(7) keV | 297,88(7) keV | 297,88(7) keV | 1,09(3) s | IT | $^{163}$Ho | 1/2$^+$ | |
| $^{164}$Ho | 67 | 97 | 163,9302335(30) | 29(1) min | EV (60%) | $^{164}$Dy | 1$^+$ | |
| $^{164}$Ho | 67 | 97 | 163,9302335(30) | 29(1) min | β$^−$ (40%) | $^{164}$Er | 1$^+$ | |
| $^{164m}$Ho | 139,77(8) keV | 139,77(8) keV | 139,77(8) keV | 38,0(10) min | IT | $^{164}$Ho | 6$^−$ | |
| $^{165}$Ho | 67 | 98 | 164,9303221(27) | stabiel | stabiel | stabiel | 7/2$^−$ | 1,0000 |
| $^{166}$Ho | 67 | 99 | 165,9322842(27) | 26,83(2) uur | β$^−$ | $^{166}$Er | 0$^−$ | |
| $^{166m1}$Ho | 5,985(18) keV | 5,985(18) keV | 5,985(18) keV | 1,200(180) jaar | β$^−$ | $^{166}$Er | 7$^−$ | |
| $^{166m2}$Ho | 190,9052(20) keV | 190,9052(20) keV | 190,9052(20) keV | 185(15) µs | | | 3$^+$ | |
| $^{167}$Ho | 67 | 100 | 166,933133(6) | 3,003(18) uur | β$^−$ | $^{167}$Er | 7/2$^−$ | |
| $^{167m}$Ho | 259,34(11) keV | 259,34(11) keV | 259,34(11) keV | 6,0(10) µs | | | 3/2$^+$ | |
| $^{168}$Ho | 67 | 101 | 167,93552(3) | 2,99(7) min | β$^−$ | $^{168}$Er | 3$^+$ | |
| $^{168m1}$Ho | 59(1) keV | 59(1) keV | 59(1) keV | 132(4) s | IT (99,5%) | $^{168}$Ho | (6$^+$) | |
| $^{168m1}$Ho | 59(1) keV | 59(1) keV | 59(1) keV | 132(4) s | β$^−$ (0,5%) | $^{168}$Er | (6$^+$) | |
| $^{168m2}$Ho | 143,4(2) keV | 143,4(2) keV | 143,4(2) keV | > 4 µs | | | 1$^−$ | |
| $^{168m3}$Ho | 192,6(2) keV | 192,6(2) keV | 192,6(2) keV | 108(11) ns | | | 1$^+$ | |
| $^{169}$Ho | 67 | 102 | 168,936872(22) | 4,72(10) min | β$^−$ | $^{169}$Er | 7/2$^−$ | |
| $^{170}$Ho | 67 | 103 | 169,93962(5) | 2,76(5) min | β$^−$ | $^{170}$Er | 6$^+$ | |
| $^{170m}$Ho | 120(70) keV | 120(70) keV | 120(70) keV | 43(2) s | β$^−$ | $^{170}$Er | (1$^+$) | |
| $^{171}$Ho | 67 | 104 | 170,94147(64) | 53(2) s | β$^−$ | $^{171}$Er | 7/2$^−$ | |
| $^{172}$Ho | 67 | 105 | 171,94482(43) | 25(3) s | β$^−$ | $^{172}$Er | | |
| $^{173}$Ho | 67 | 106 | 172,94729(43) | 10 s | β$^−$ | $^{173}$Er | 7/2$^−$ | |
| $^{174}$Ho | 67 | 107 | 173,95115(54) | 8 s | | | | |
| $^{175}$Ho | 67 | 108 | 174,95405(64) | 5 s | | | 7/2$^−$ | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683-800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
$^{140}$Ho · $^{141}$Ho · $^{141m}$Ho · $^{142}$Ho · $^{143}$Ho · $^{144}$Ho · $^{145}$Ho · $^{145m}$Ho · $^{146}$Ho · $^{147}$Ho · $^{148}$Ho · $^{148m1}$Ho · $^{148m2}$Ho · $^{149}$Ho · $^{149m1}$Ho · $^{149m2}$Ho · $^{150}$Ho · $^{150m1}$Ho · $^{150m2}$Ho · $^{151}$Ho · $^{151m}$Ho · $^{152}$Ho · $^{152m1}$Ho · $^{152m2}$Ho · $^{153}$Ho · $^{153m1}$Ho · $^{153m2}$Ho · $^{154}$Ho · $^{154m}$Ho · $^{155}$Ho · $^{155m}$Ho · $^{156}$Ho · $^{156m1}$Ho · $^{156m2}$Ho · $^{157}$Ho · $^{158}$Ho · $^{158m1}$Ho · $^{158m2}$Ho · $^{159}$Ho · $^{159m}$Ho · $^{160}$Ho · $^{160m1}$Ho · $^{160m2}$Ho · $^{161}$Ho · $^{161m}$Ho · $^{162}$Ho · $^{162m}$Ho · $^{163}$Ho · $^{163m}$Ho · $^{164}$Ho · $^{164m}$Ho · $^{165}$Ho · $^{166}$Ho · $^{166m1}$Ho · $^{166m2}$Ho · $^{167}$Ho · $^{167m}$Ho · $^{168}$Ho · $^{168m1}$Ho · $^{168m2}$Ho · $^{168m3}$Ho · $^{169}$Ho · $^{170}$Ho · $^{170m}$Ho · $^{171}$Ho · $^{172}$Ho · $^{173}$Ho · $^{174}$Ho · $^{175}$Ho · $^{176}$Ho