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Isotopes of Dysprosium

List, data and properties of all known isotopes of Dysprosium as well as radioactive decay products and intermediate products.

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
138Dy6613872Dysprosium-138137.96249(64) u
[137.9262868 u]
{-34.94034 MeV}
139Dy6613973Dysprosium-139138.95959(54) u
[138.9233868 u]
{-37.64167 MeV}
(7/2+)
140Dy6614074Dysprosium-140139.95402(43) u
[139.9178168 u]
{-42.83009 MeV}
0+
140mDy6614074Dysprosium-140m139.95402(43) u
[139.9178168 u]
{-42.83009 MeV}
(8-)
141Dy6614175Dysprosium-141140.95128(32) u
[140.9150768 u]
{-45.38239 MeV}
(9/2-)
142Dy6614276Dysprosium-142141.94619(78) u
[141.9099868 u]
{-50.12369 MeV}
0+
143Dy6614377Dysprosium-143142.943994(14) u
[142.9077908 u]
{-52.16925 MeV}
(1/2+)
143mDy6614377Dysprosium-143m142.943994(14) u
[142.9077908 u]
{-52.16925 MeV}
(11/2-)
144Dy6614478Dysprosium-144143.939270(8) u
[143.9030668 u]
{-56.56963 MeV}
0+
145Dy6614579Dysprosium-145144.937474(7) u
[144.9012708 u]
{-58.24259 MeV}
(1/2+)145Ho
145mDy6614579Dysprosium-145m144.937474(7) u
[144.9012708 u]
{-58.24259 MeV}
(11/2-)
146Dy6614680Dysprosium-146145.932845(7) u
[145.8966418 u]
{-62.55448 MeV}
0+146Ho
146mDy6614680Dysprosium-146m145.932845(7) u
[145.8966418 u]
{-62.55448 MeV}
(10+)
147Dy6614781Dysprosium-147146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}
(1/2+)+ 1.70(5)147Ho
147m1Dy6614781Dysprosium-147m1146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}
11/2-
147m2Dy6614781Dysprosium-147m2146.931083(9) u
[146.8948798 u]
{-64.19577 MeV}
(27/2-)
148Dy6614882Dysprosium-148147.927150(9) u
[147.8909468 u]
{-67.85934 MeV}
0+- 1.75(2)148Ho
149Er
152Er
149Dy6614983Dysprosium-149148.927325(10) u
[148.8911218 u]
{-67.69633 MeV}
(7/2-)-0.119(7)149Ho
153Er
149mDy6614983Dysprosium-149m148.927325(10) u
[148.8911218 u]
{-67.69633 MeV}
(27/2-)- 0.119(7)
150Dy6615084Dysprosium-150149.925593(5) u
[149.8893898 u]
{-69.30967 MeV}
0+150Ho
154Er
151Dy6615185Dysprosium-151150.926191(4) u
[150.8899878 u]
{-68.75264 MeV}
7/2(-)- 0.945(7)151Ho
155Er
152Dy6615286Dysprosium-152151.924725(5) u
[151.8885218 u]
{-70.11821 MeV}
0+152Ho
153Dy6615387Dysprosium-153152.925772(4) u
[152.8895688 u]
{-69.14294 MeV}
7/2(-)- 0.782(6)153Ho
154Dy6615488Dysprosium-154153.924429(8) u
[153.8882258 u]
{-70.39393 MeV}
0+154Ho
155Dy6615589Dysprosium-155154.925758(10) u
[154.8895548 u]
{-69.15598 MeV}
3/2-- 0.339(2)155Ho
155mDy6615589Dysprosium-155m154.925758(10) u
[154.8895548 u]
{-69.15598 MeV}
11/2-
156Dy6615690Dysprosium-156155.92428(2) u
[155.8880768 u]
{-70.53273 MeV}
0+156Ho
157Dy6615791Dysprosium-157156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}
3/2-- 0.301(2)157Ho
157m1Dy6615791Dysprosium-157m1156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}
9/2+
157m2Dy6615791Dysprosium-157m2156.925470(6) u
[156.8892668 u]
{-69.42425 MeV}
11/2-
158Dy6615892Dysprosium-158157.92442(2) u
[157.8882168 u]
{-70.40232 MeV}
0+158Ho
158Tb
159Dy6615993Dysprosium-159158.9257460(16) u
[158.8895428 u]
{-69.16716 MeV}
3/2-- 0.354(3)159Ho
159mDy6615993Dysprosium-159m158.9257460(16) u
[158.8895428 u]
{-69.16716 MeV}
11/2-
160Dy6616094Dysprosium-160159.92520(2) u
[159.8889968 u]
{-69.67575 MeV}
0+160Ho
160Tb
161Dy6616195Dysprosium-161160.92694(2) u
[160.8907368 u]
{-68.05495 MeV}
5/2+- 0.480(3)161Ho
161Tb
162Dy6616296Dysprosium-162161.92681(2) u
[161.8906068 u]
{-68.17605 MeV}
0+162Ho
162Tb
163Dy6616397Dysprosium-163162.92874(2) u
[162.8925368 u]
{-66.37826 MeV}
5/2-+ 0.6726(35)163Ho
163Tb
164Dy6616498Dysprosium-164163.92918(2) u
[163.8929768 u]
{-65.96841 MeV}
0+164Ho
164Tb
165Dy6616599Dysprosium-165164.9317091(8) u
[164.8955059 u]
{-63.61256 MeV}
7/2+- 0.520(5)165Tb
165mDy6616599Dysprosium-165m164.9317091(8) u
[164.8955059 u]
{-63.61256 MeV}
1/2-
166Dy66166100Dysprosium-166165.9328125(9) u
[165.8966093 u]
{-62.58475 MeV}
0+
167Dy66167101Dysprosium-167166.93566(6) u
[166.8994568 u]
{-59.93232 MeV}
(1/2-)167Tb
168Dy66168102Dysprosium-168167.93713(15) u
[167.9009268 u]
{-58.56303 MeV}
0+168Tb
169Dy66169103Dysprosium-169168.94031(32) u
[168.9041068 u]
{-55.60088 MeV}
(5/2)-
170Dy66170104Dysprosium-170169.94239(21) u
[169.9061868 u]
{-53.66337 MeV}
0+
171Dy66171105Dysprosium-171170.94612(32) u
[170.9099168 u]
{-50.1889 MeV}
172Dy66172106Dysprosium-172171.94846(32) u
[171.9122568 u]
{-48.0092 MeV}
0+
173Dy66173107Dysprosium-173172.95283(43) u
[172.9166268 u]
{-43.93857 MeV}
(9/2+)
174Dy66174108Dysprosium-174173.95559(54) u
[173.9193868 u]
{-41.36765 MeV}
0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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 %2.1661(5) keVAL
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 %
?

310.7(6) keVAL
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 %
?

118.2(2) keVAL
Dy-14633.2(7) sEC/β+146Tb100 %5.21(5) MeVAL
Dy-146m0.150(20) sIso → 146Dy100 %2934.5(4) keVAL
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) %

750.5(4) keVAL
Dy-147m20.40(1) μs3407.2(8) keVAL
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) %

2661.1(4)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 %234.33(3) keVAL
Dy-156stableAL
Dy-1578.14(4) hEC/β+157Tb100 %1.339(5) MeVAL
Dy-157m11.3(2) μs161.99(3) keVAL
Dy-157m221.6(16) msIso → 157Dy100 %199.38(7) keVAL
Dy-158stableAL
Dy-159144.4(2) dEC → 159Tb100 %0.3652(20) MeVAL
Dy-159m122(3) μsIso → 159Dy100 %352.77(14) keVAL
Dy-160stableAL
Dy-161stableAL
Dy-162stableAL
Dy-163stableAL
Dy-164stableAL
Dy-1652.334(1) hβ-165Ho100 %1.2864(8) MeVAL
Dy-165m1.257(6) minβ-165Ho
Iso → 165Dy
2.24(11) %
97.76(11) %

108.1552(13) keVAL
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Dysprosium isotope.
6 - 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Dysprosium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
161Dy
18,889(42) %
5/2+
- 0,480(3)0,9206+250,71,46540,00048
0,4015
163Dy
24,896(42) %
5/2-
+ 0,6726(35)1,275264,8(21)2,05080,00130
0,5619

1) Quantity Percentage of natural occurrence.

2) 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.

 


Category: Isotopes

Last update: 05.07.2020



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