From Wikipedia, the free encyclopedia

Naturally occurring dysprosium (Dy) is composed of 7 stable isotopes, 156Dy, 158Dy, 160Dy, 161Dy, 162Dy, 163Dy and 164Dy,with 164Dy being the most abundant (28.18% natural abundance). 29 radioisotopes have been characterized, with the most stablebeing 154Dy with a half-life of 3.0 million years, 159Dy with a half-life of 144.4 days, and 166Dy with a half-life of 81.6 hours. Allof the remaining radioactive isotopes have half-lives that are less than 10 hours, and the majority of these have half-lives that areless than 30 seconds. This element also has 12 meta states, with the most stable being 165mDy (t½ 1.257 minutes), 147mDy (t½55.7 seconds) and 145mDy (t½ 13.6 seconds).

The primary decay mode before the most abundant stable isotope, 164Dy, is electron capture, and the primary mode after is betaminus decay. The primary decay products before 164Dy are terbium isotopes, and the primary products after are holmiumisotopes.

164Dy is the heaviest theoretically stable isotope.[citation needed]]]

Standard atomic mass: 162.500(1) u

Isotopes of dysprosium - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Isotopes_of_dysprosium

1 of 4 11.2.2014 18:06

nuclidesymbol

Z(p) N(n)

isotopic mass (u) half-life

decaymode(s)[1][n 1]

daughterisotope(s)[n 2]

nuclearspin

representativeisotopic

composition(mole fraction)

range of naturalvariation

(mole fraction)excitation energy

138Dy 66 72 137.96249(64)# 200# ms 0+139Dy 66 73 138.95954(54)# 600(200) ms 7/2+#140Dy 66 74 139.95401(54)# 700# ms β+ 140Tb 0+

140mDy 2166.1(5) keV 7.0(5) µs (8-)

141Dy 66 75 140.95135(32)# 0.9(2) sβ+ 141Tb

(9/2-)β+, p (rare) 140Gd

142Dy 66 76 141.94637(39)# 2.3(3) sβ+ (99.94%) 142Tb

0+β+, p (.06%) 141Gd

143Dy 66 77 142.94383(21)# 5.6(10) sβ+ 143Tb

(1/2+)β+, p (rare) 142Gd

143mDy 310.7(6) keV 3.0(3) s (11/2-)

144Dy 66 78 143.93925(3) 9.1(4) sβ+ 144Tb

0+β+, p (rare) 143Gd

145Dy 66 79 144.93743(5) 9.5(10) sβ+ 145Tb

(1/2+)β+, p (rare) 144Gd

145mDy 118.2(2) keV 14.1(7) s β+ 145Tb (11/2-)146Dy 66 80 145.932845(29) 33.2(7) s β+ 146Tb 0+

146mDy 2935.7(6) keV 150(20) ms IT 146Dy (10+)#

147Dy 66 81 146.931092(21) 40(10) sβ+ (99.95%) 147Tb

1/2+β+, p (.05%) 146Tb

147m1Dy 750.5(4) keV 55(1) sβ+ (65%) 147Tb

11/2-IT (35%) 147Dy

147m2Dy 3407.2(8) keV 0.40(1) µs (27/2-)148Dy 66 82 147.927150(11) 3.3(2) min β+ 148Tb 0+149Dy 66 83 148.927305(9) 4.20(14) min β+ 149Tb 7/2(-)

149mDy 2661.1(4) keV 490(15) msIT (99.3%) 149Dy

(27/2-)β+ (.7%) 149Tb

150Dy 66 84 149.925585(5) 7.17(5) minβ+ (64%) 150Tb

0+α (36%) 146Gd

151Dy 66 85 150.926185(4) 17.9(3) minβ+ (94.4%) 151Tb

7/2(-)α (5.6%) 147Gd

152Dy 66 86 151.924718(6) 2.38(2) hEC (99.9%) 152Tb

0+α (.1%) 148Gd

153Dy 66 87 152.925765(5) 6.4(1) hβ+ (99.99%) 153Tb

7/2(-)α (.00939%) 149Gd

154Dy 66 88 153.924424(8) 3.0(15)×106 a α 150Gd 0+

Isotopes of dysprosium - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Isotopes_of_dysprosium

2 of 4 11.2.2014 18:06

β+β+ (rare) 154Gd155Dy 66 89 154.925754(13) 9.9(2) h β+ 155Tb 3/2-

155mDy 234.33(3) keV 6(1) µs 11/2-156Dy 66 90 155.924283(7) Observationally Stable[n 3] 0+ 5.6(3)×10−4

157Dy 66 91 156.925466(7) 8.14(4) h β+ 157Tb 3/2-157m1Dy 161.99(3) keV 1.3(2) µs 9/2+157m2Dy 199.38(7) keV 21.6(16) ms IT 157Dy 11/2-

158Dy 66 92 157.924409(4) Observationally Stable[n 4] 0+ 9.5(3)×10−4

159Dy 66 93 158.9257392(29) 144.4(2) d EC 159Tb 3/2-159mDy 352.77(14) keV 122(3) µs 11/2-

160Dy 66 94 159.9251975(27) Observationally Stable[n 5] 0+ 0.02329(18)161Dy 66 95 160.9269334(27) Observationally Stable[n 6] 5/2+ 0.18889(42)162Dy 66 96 161.9267984(27) Observationally Stable[n 7] 0+ 0.25475(36)163Dy 66 97 162.9287312(27) Stable[n 8][n 9][2] 5/2- 0.24896(42)164Dy 66 98 163.9291748(27) Stable[n 8] 0+ 0.28260(54)165Dy 66 99 164.9317033(27) 2.334(1) h β- 165Ho 7/2+

165mDy 108.160(3) keV 1.257(6) minIT (97.76%) 165Dy

1/2-β- (2.24%) 165Ho

166Dy 66 100 165.9328067(28) 81.6(1) h β- 166Ho 0+167Dy 66 101 166.93566(6) 6.20(8) min β- 167Ho (1/2-)168Dy 66 102 167.93713(15) 8.7(3) min β- 168Ho 0+169Dy 66 103 168.94031(32) 39(8) s β- 169Ho (5/2-)170Dy 66 104 169.94239(21)# 30# s β- 170Ho 0+171Dy 66 105 170.94620(32)# 6# s β- 171Ho 7/2-#172Dy 66 106 171.94876(43)# 3# s β- 172Ho 0+173Dy 66 107 172.95300(54)# 2# s β- 173Ho 9/2+#

^ Abbreviations:EC: Electron captureIT: Isomeric transition

1.

^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)2.^ Believed to undergo α decay to 152Gd or β+β+ decay to 156Gd with a half-life over 1018 years3.^ Believed to undergo α decay to 154Gd or β+β+ decay to 158Gd4.^ Believed to undergo α decay to 156Gd5.^ Believed to undergo α decay to 157Gd6.^ Believed to undergo α decay to 158Gd7.^ a b Theoretically capable of spontaneous fission8.^ Can undergo bound-state β- decay to 163Ho with a half-life of 47 days when fully ionized9.

Notes

Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. Theuncertainty in the atomic mass may exceed the stated value for such specimens.Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weakassignment arguments are enclosed in parentheses.Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one

Isotopes of dysprosium - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Isotopes_of_dysprosium

3 of 4 11.2.2014 18:06

standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

^ http://www.nucleonica.net/unc.aspx1.^ M. Jung et al., Phys. Rev. Letts. 69, 2164 (1992) First observation of bound-state beta minus decay.2.

Isotope masses from:G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear anddecay properties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A).doi:10.1016/j.nuclphysa.2003.11.001 (http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).

Isotopic compositions and standard atomic masses from:J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003)."Atomic weights of the elements. Review 2000 (IUPAC Technical Report)" (http://www.iupac.org/publications/pac/75/6/0683/pdf/). Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683(http://dx.doi.org/10.1351%2Fpac200375060683).M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)" (http://iupac.org/publications/pac/78/11/2051/pdf/). Pure and Applied Chemistry 78 (11): 2051–2066.doi:10.1351/pac200678112051 (http://dx.doi.org/10.1351%2Fpac200678112051). Lay summary (http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html).

Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear anddecay properties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A).doi:10.1016/j.nuclphysa.2003.11.001 (http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).National Nuclear Data Center. "NuDat 2.1 database" (http://www.nndc.bnl.gov/nudat2/). Brookhaven NationalLaboratory. Retrieved September 2005.N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.).CRC Press. Section 11. ISBN 978-0-8493-0485-9.

Isotopes of terbium Isotopes of dysprosium Isotopes ofholmium

Table of nuclides

Retrieved from "http://en.wikipedia.org/w/index.php?title=Isotopes_of_dysprosium&oldid=588077580"Categories: Dysprosium Isotopes of dysprosium Lists of isotopes by element

This page was last modified on 28 December 2013 at 15:32.Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using thissite, you agree to the Terms of Use and Privacy Policy.Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.

Isotopes of dysprosium - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Isotopes_of_dysprosium

4 of 4 11.2.2014 18:06