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Isotopes of Dysprosium

List, data and properties of all known isotopes of Dysprosium.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Dysprosium isotopes

All atomic nuclei of the chemical element dysprosium are summarized under dysprosium isotopes; these all consist of an atomic nucleus with 66 protons and, in the uncharged state, 66 electrons. The difference between each dysprosium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Dysprosium Isotopes

Dysprosium is a chemical element from the group of rare earth metals (rare earths) or lanthanides; 7 stable and 29 unstable nuclides of dysprosium are known in nature:

Atomic Mass maQuantityHalf-lifeSpin
Dysprosium
Isotopic mixture		162,500 u100 %
Isotope 156Dy155,92428(2) u0,056(3) %stable0+
Isotope 158Dy157,92442(2) u0,095(3) %stable0+
Isotope 160Dy159,92520(2) u2,329(18) %stable0+
Isotope 161Dy160,92694(2) u18,889(42) %stable5/2+
Isotope 162Dy161,92681(2) u25,475(36) %stable0+
Isotope 163Dy162,92874(2) u24,896(42) %stable5/2-
Isotope 164Dy163,92918(2) u28,260(54) %stable0+

 

The individual dysprosium isotopes are technically or medically of little importance; the isotope 165Dy is listed in the form of a colloid as an anti-inflammatory radiotherapeutic agent in the ATC code list (V10AX03).

 

Isotope Table: Dysprosium

The two following tables list the most important data and properties of the Dysprosium isotopes. Further information on the individual Dysprosium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Dysprosium-13813866Dy72137.96249(64) u
[137.9262868 u]
{-34.94034 MeV}
Dysprosium-13913966Dy73138.95959(54) u
[138.9233868 u]
{-37.64167 MeV}		(7/2+)
Dysprosium-14014066Dy74139.95402(43) u
[139.9178168 u]
{-42.83009 MeV}		0+
Dysprosium-140m140m66Dy74139.95402(43) u
[139.9178168 u]
{-42.83009 MeV}		(8-)
Dysprosium-14114166Dy75140.95128(32) u
[140.9150768 u]
{-45.38239 MeV}		(9/2-)
Dysprosium-14214266Dy76141.94619(78) u
[141.9099868 u]
{-50.12369 MeV}		0+
Dysprosium-14314366Dy77142.943994(14) u
[142.9077908 u]
{-52.16925 MeV}		(1/2+)
Dysprosium-143m143m66Dy77142.943994(14) u
[142.9077908 u]
{-52.16925 MeV}		(11/2-)
Dysprosium-14414466Dy78143.939270(8) u
[143.9030668 u]
{-56.56963 MeV}		0+
Dysprosium-14514566Dy79144.937474(7) u
[144.9012708 u]
{-58.24259 MeV}		(1/2+)145Ho
Dysprosium-145m145m66Dy79144.937474(7) u
[144.9012708 u]
{-58.24259 MeV}		(11/2-)
Dysprosium-14614666Dy80145.932845(7) u
[145.8966418 u]
{-62.55448 MeV}		0+146Ho
Dysprosium-146m146m66Dy80145.932845(7) u
[145.8966418 u]
{-62.55448 MeV}		(10+)
Dysprosium-14714766Dy81146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}		(1/2+)147Ho
Dysprosium-147m1147m166Dy81146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}		11/2-
Dysprosium-147m2147m266Dy81146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}		(27/2-)
Dysprosium-14814866Dy82147.927150(9) u
[147.8909468 u]
{-67.85934 MeV}		0+148Ho
149Er
152Er
Dysprosium-14914966Dy83148.927325(10) u
[148.8911218 u]
{-67.69633 MeV}		(7/2-)149Ho
153Er
Dysprosium-149m149m66Dy83148.927325(10) u
[148.8911218 u]
{-67.69633 MeV}		(27/2-)
Dysprosium-15015066Dy84149.925593(5) u
[149.8893898 u]
{-69.30967 MeV}		0+150Ho
154Er
Dysprosium-15115166Dy85150.926191(4) u
[150.8899878 u]
{-68.75264 MeV}		7/2(-)151Ho
155Er
Dysprosium-15215266Dy86151.924725(5) u
[151.8885218 u]
{-70.11821 MeV}		0+152Ho
Dysprosium-15315366Dy87152.925772(4) u
[152.8895688 u]
{-69.14294 MeV}		7/2(-)153Ho
Dysprosium-15415466Dy88153.924429(8) u
[153.8882258 u]
{-70.39393 MeV}		0+154Ho
Dysprosium-15515566Dy89154.925758(10) u
[154.8895548 u]
{-69.15598 MeV}		3/2-155Ho
Dysprosium-155m155m66Dy89154.925758(10) u
[154.8895548 u]
{-69.15598 MeV}		11/2-
Dysprosium-15615666Dy90155.92428(2) u
[155.8880768 u]
{-70.53273 MeV}		0+156Ho
Dysprosium-15715766Dy91156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}		3/2-157Ho
Dysprosium-157m1157m166Dy91156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}		9/2+
Dysprosium-157m2157m266Dy91156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}		11/2-
Dysprosium-15815866Dy92157.92442(2) u
[157.8882168 u]
{-70.40232 MeV}		0+158Ho
158Tb
Dysprosium-15915966Dy93158.9257460(16) u
[158.8895428 u]
{-69.16716 MeV}		3/2-159Ho
Dysprosium-159m159m66Dy93158.9257460(16) u
[158.8895428 u]
{-69.16716 MeV}		11/2-
Dysprosium-16016066Dy94159.92520(2) u
[159.8889968 u]
{-69.67575 MeV}		0+160Ho
160Tb
Dysprosium-16116166Dy95160.92694(2) u
[160.8907368 u]
{-68.05495 MeV}		5/2+161Ho
161Tb
Dysprosium-16216266Dy96161.92681(2) u
[161.8906068 u]
{-68.17605 MeV}		0+162Ho
162Tb
Dysprosium-16316366Dy97162.92874(2) u
[162.8925368 u]
{-66.37826 MeV}		5/2-163Ho
163Tb
Dysprosium-16416466Dy98163.92918(2) u
[163.8929768 u]
{-65.96841 MeV}		0+164Ho
164Tb
Dysprosium-16516566Dy99164.9317094(7) u
[164.8955062 u]
{-63.61228 MeV}		7/2+165Tb
Dysprosium-165m165m66Dy99164.9317094(7) u
[164.8955062 u]
{-63.61228 MeV}		1/2-
Dysprosium-16616666Dy100165.9328125(9) u
[165.8966093 u]
{-62.58475 MeV}		0+
Dysprosium-16716766Dy101166.93566(6) u
[166.8994568 u]
{-59.93232 MeV}		(1/2-)167Tb
Dysprosium-16816866Dy102167.93713(15) u
[167.9009268 u]
{-58.56303 MeV}		0+168Tb
Dysprosium-16916966Dy103168.94031(32) u
[168.9041068 u]
{-55.60088 MeV}		(5/2)-
Dysprosium-17017066Dy104169.94239(21) u
[169.9061868 u]
{-53.66337 MeV}		0+
Dysprosium-17117166Dy105170.94612(32) u
[170.9099168 u]
{-50.1889 MeV}
Dysprosium-17217266Dy106171.94846(32) u
[171.9122568 u]
{-48.0092 MeV}		0+
Dysprosium-17317366Dy107172.95283(43) u
[172.9166268 u]
{-43.93857 MeV}		(9/2+)
Dysprosium-17417466Dy108173.95559(54) u
[173.9193868 u]
{-41.36765 MeV}		0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Dy-138- ungelistet -AL
Dy-1390.6(2) sEC/β+ → 139Tb
EC, p → 138Gd		89 %
11 %		10.49(58) MeV
AL
Dy-1400.7 sEC/β+ → 140Tb?7.65(90) MeVAL
Dy-140m7.0(5) μsIso → 140Dy100 %AL
Dy-1410.9(2) sEC/β+ → 141Tb
β+, p → 140Gd		100 %
?		9.16(32) MeV
AL
Dy-1422.3(3) sEC/β+ → 142Tb
EC, p → 141Gd		99.96 %
0.06 %		6.44 MeV
AL
Dy-1435.6(10) sEC/β+ → 143Tb
EC, p → 142Gd		100 %
?		8.25(5) MeV
AL
Dy-143m3.0(3) sEC/β+ → 143Tb
EC, p → 142Gd		100 %
?
AL
Dy-1449.1(4) sEC/β+ → 144Tb
EC, p → 143Gd		100 %
?		5.798(29) MeV
AL
Dy-1456(2) sEC/β+ → 145Tb
EC, p → 144Gd		100 %
?		8.15(11) MeV
AL
Dy-145m14.1(7) sEC/β+ → 145Tb
EC, p → 144Gd		100 %
?
AL
Dy-14633.2(7) sEC/β+ → 146Tb100 %5.21(5) MeVAL
Dy-146m0.150(20) sIso → 146Dy100 %AL
Dy-14767(7) sEC/β+ → 147Tb
EC, p → 146Gd		> 99 %
< 1 %		6.547(12) MeV
AL
Dy-147m155.2(5) sEC/β+ → 147Tb
Iso → 147Dy		68.9(23) %
31.1(23) %
AL
Dy-147m20.40(1) μsAL
Dy-1483.3(2) minEC/β+ → 148Tb100 %2.978(15) MeVAL
Dy-1494.20(14) minEC/β+ → 149Tb100 %3.793(10)AL
Dy-149m0.490(15) sEC/β+ → 149Tb
Iso → 149Dy		0.7(3) %
99.3(3) %
AL
Dy-1507.17(5) minEC/β+ → 150Tb
α → 146Gd		64(5) %
36(5) %		1.796(9) MeV
4.3513(15) MeV		AL
Dy-15117.9(3) minEC/β+ → 151Tb
α → 147Gd		94.4(4) %
5.6(4) %		2.871(5) MeV
4.1796(26) MeV		AL
Dy-1522.38(2) hEC/β+ → 152Tb
α → 148Gd		99.900(7) %
0.100(7) %		0.60(4) MeV
3.727(4) MeV		AL
Dy-1536.4(1) hEC/β+ → 153Tb
α → 149Gd		99.9906(14) %
0.0094(14) %		2.170(6) MeV
3.559(4) MeV		AL
Dy-1543.0(15) × 106 aα → 150Gd100 %2.945(5) MeVAL
Dy-1559.9(2) hEC/β+ → 155Tb100 %2.094(14) MeVAL
Dy-155m6(1) μsIso → 155Dy100 %AL
Dy-156stableAL
Dy-1578.14(4) hEC/β+ → 157Tb100 %1.339(5) MeVAL
Dy-157m11.3(2) μsAL
Dy-157m221.6(16) msIso → 157Dy100 %AL
Dy-158stableAL
Dy-159144.4(2) dEC → 159Tb100 %0.3652(20) MeVAL
Dy-159m122(3) μsIso → 159Dy100 %AL
Dy-160stableAL
Dy-161stableAL
Dy-162stableAL
Dy-163stableAL
Dy-164stableAL
Dy-1652.332(4) hβ- → 165Ho100 %1.2857(8) MeVAL
Dy-165m1.257(6) minβ- → 165Ho
Iso → 165Dy		2.24(11) %
97.76(11) %
AL
Dy-16681.6(1) hβ- → 166Ho100 %0.4865(9) MeVAL
Dy-1676.20(8) minβ- → 167Ho100 %2.35(6) MeVAL
Dy-1688.7(3) minβ- → 168Ho100 %1.50(14) MeVAL
Dy-16939(8) sβ- → 169Ho100 %3.2(3) MeVAL
Dy-17055(8) sβ- → 170Ho100 %2.57(20) MeVAL
Dy-1714.1(4) sβ- → 171Ho100 %4.33(67) MeVAL
Dy-172160 nsβ- → 172Ho100 %3.47(36) MeVAL
Dy-1731.43(20) sβ- → 173Ho100 %5.41(50) MeVAL
Dy-174160 nsβ- → 174Ho?4.32(58) MeV

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Dysprosium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Dysprosium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Dysprosium nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
161Dy
18,889(42) %
5/2+		- 0,480(3)0,9206
{+2,507}		1,46540,00048
0,4015
163Dy
24,896(42) %
5/2-		+ 0,6726(35)1,275
{+2,648(21)}		2,05080,00130
0,5619

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Dysprosium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Dy-155106 Bq10 Bq/g9.9 h
Dy-157106 Bq100 Bq/g8.1 h
Dy-159107 Bq100 Bq/g6 TBq144.4 d
Dy-165106 Bq1000 Bq/g3 TBq100 Bq cm-22.3 h
Dy-166106 Bq100 Bq/g1 TBq10 Bq cm-281.6 h

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Dysprosium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Dysprosium: NMR properties - 161Dy-NMR, 163Dy-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - C. Fry, M. Thoennessen:
Discovery of dysprosium, holmium, erbium, thulium and ytterbium isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2012.05.004.

[10] - T. P. D. Swan, P. M. Walker, Zs. Podolyák, M. W. Reed, G. D. Dracoulis, G. J. Lane, T. Kibédi, M. L. Smith:
Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97.
In: Physical Review C, (2012), DOI 10.1103/PhysRevC.85.024313.

[11] - E. May, M. Thoennessen:
Discovery of samarium, europium, Dysprosium, and Dysprosium isotopes.
In: Atomic Data and Nuclear Data Tables, (2013), DOI 10.1016/j.adt.2012.01.007.

 

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