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Isotopes of Praseodymium

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

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

All atomic nuclei of the chemical element praseodymium are summarized under praseodymium isotopes; these all consist of an atomic nucleus with 59 protons and, in the uncharged state, 59 electrons. The difference between each praseodymium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Praseodymium Isotopes

Praseodymium, which belongs to the rare earths or rare earth metals, only exists in nature as the stable isotope praseodymium-141, atomic mass 140.90766(2) u.

 

All other praseodymium nuclides decay radioactively with short half-lives and have no technical significance.

 

Isotope Table: Praseodymium

The two following tables list the most important data and properties of the Praseodymium isotopes. Further information on the individual Praseodymium 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
Praseodymium-12112159Pr62120.95553(54) u
[120.9231662 u]
{-41.42354 MeV}		(3/2)
Praseodymium-12212259Pr63121.95181(54) u
[121.9194462 u]
{-44.8887 MeV}
Praseodymium-12312359Pr64122.94596(64) u
[122.9135962 u]
{-50.33794 MeV}		3/2+
Praseodymium-12412459Pr65123.94294(43) u
[123.9105762 u]
{-53.15105 MeV}		124Nd
Praseodymium-12512559Pr66124.93780(32) u
[124.9054362 u]
{-57.93893 MeV}		125Nd
Praseodymium-12612659Pr67125.93524(21) u
[125.9028762 u]
{-60.32355 MeV}		126Nd
Praseodymium-12712759Pr68126.93071(21) u
[126.8983462 u]
{-64.54322 MeV}		127Nd
Praseodymium-127m127m59Pr68126.93071(21) u
[126.8983462 u]
{-64.54322 MeV}		11/2-
Praseodymium-12812859Pr69127.92879(3) u
[127.8964262 u]
{-66.33169 MeV}		4,5,6128Nd
Praseodymium-12912959Pr70128.92509(3) u
[128.8927262 u]
{-69.77822 MeV}		(3/2+)129Nd
Praseodymium-129m129m59Pr70128.92509(3) u
[128.8927262 u]
{-69.77822 MeV}		(11/2-)
Praseodymium-13013059Pr71129.92359(7) u
[129.8912262 u]
{-71.17546 MeV}		(5+)130Nd
Praseodymium-130m130m59Pr71129.92359(7) u
[129.8912262 u]
{-71.17546 MeV}		2+
Praseodymium-13113159Pr72130.92023(5) u
[130.8878662 u]
{-74.30528 MeV}		(3/2+)131Nd
Praseodymium-13113159Pr73130.92023(5) u
[130.8878662 u]
{-74.30528 MeV}		(11/2-)132Nd
Praseodymium-13213259Pr73131.91924(3) u
[131.8868762 u]
{-75.22746 MeV}		(2)+
Praseodymium-132m132m59Pr73131.91924(3) u
[131.8868762 u]
{-75.22746 MeV}		(5+)
Praseodymium-13313359Pr74132.916331(13) u
[132.8839672 u]
{-77.93717 MeV}		(3/2+)133Nd
Praseodymium-133m133m59Pr74132.916331(13) u
[132.8839672 u]
{-77.93717 MeV}		(11/2-)
Praseodymium-13413459Pr75133.915697(22) u
[133.8833332 u]
{-78.52774 MeV}		2-134Nd
Praseodymium-134m134m59Pr75133.915697(22) u
[133.8833332 u]
{-78.52774 MeV}		(6-)
Praseodymium-13513559Pr76134.913112(13) u
[134.8807482 u]
{-80.93565 MeV}		3/2(+)135Nd
Praseodymium-135m135m59Pr76134.913112(13) u
[134.8807482 u]
{-80.93565 MeV}		(11/2-)
Praseodymium-13613659Pr77135.912678(12) u
[135.8803142 u]
{-81.33992 MeV}		2+136Nd
Praseodymium-13713759Pr78136.910679(9) u
[136.8783152 u]
{-83.20198 MeV}		5/2+137Nd
Praseodymium-137m137m59Pr78136.910679(9) u
[136.8783152 u]
{-83.20198 MeV}		11/2-
Praseodymium-13813859Pr79137.910752(12) u
[137.8783882 u]
{-83.13398 MeV}		1+138Nd
Praseodymium-138m138m59Pr79137.910752(12) u
[137.8783882 u]
{-83.13398 MeV}		7-
Praseodymium-13913959Pr80138.908943(8) u
[138.8765792 u]
{-84.81905 MeV}		5/2+139Nd
Praseodymium-14014059Pr81139.909084(7) u
[139.8767202 u]
{-84.68771 MeV}		1+140Nd
Praseodymium-140m1140m159Pr81139.909084(7) u
[139.8767202 u]
{-84.68771 MeV}		5+
Praseodymium-140m2140m259Pr81139.909084(7) u
[139.8767202 u]
{-84.68771 MeV}		(7)-
Praseodymium-14114159Pr82140.90766(2) u
[140.8752962 u]
{-86.01416 MeV}		5/2+141Nd
141Ce
145Pm
Praseodymium-14214259Pr83141.9100504(18) u
[141.8776866 u]
{-83.78751 MeV}		2-
Praseodymium-142m142m59Pr83141.9100504(18) u
[141.8776866 u]
{-83.78751 MeV}		5-
Praseodymium-14314359Pr84142.9108226(20) u
[142.8784588 u]
{-83.06821 MeV}		7/2+143Ce
Praseodymium-14414459Pr85143.9133107(29) u
[143.8809469 u]
{-80.75056 MeV}		0-144Ce
Praseodymium-144m144m59Pr85143.9133107(29) u
[143.8809469 u]
{-80.75056 MeV}		3-
Praseodymium-14514559Pr86144.914518(8) u
[144.8821542 u]
{-79.62597 MeV}		7/2+145Ce
Praseodymium-14614659Pr87145.91768(4) u
[145.8853162 u]
{-76.68059 MeV}		(2)-146Ce
Praseodymium-14714759Pr88146.919007(17) u
[146.8866432 u]
{-75.44449 MeV}		(5/2+)147Ce
Praseodymium-14814859Pr89147.922130(16) u
[147.8897662 u]
{-72.53544 MeV}		1-148Ce
Praseodymium-148m148m59Pr89147.922130(16) u
[147.8897662 u]
{-72.53544 MeV}		(4-)
Praseodymium-14914959Pr90148.923736(11) u
[148.8913722 u]
{-71.03946 MeV}		(5/2+)149Ce
Praseodymium-15015059Pr91149.926676(10) u
[149.8943122 u]
{-68.30087 MeV}		(1-)150Ce
Praseodymium-15115159Pr92150.928309(13) u
[150.8959452 u]
{-66.77974 MeV}		(3/2-)151Ce
Praseodymium-15215259Pr93151.931553(20) u
[151.8991892 u]
{-63.75797 MeV}		(4+)152Ce
Praseodymium-15315359Pr94152.933904(13) u
[152.9015402 u]
{-61.56803 MeV}		153Ce
Praseodymium-15415459Pr95153.93762(12) u
[153.9052562 u]
{-58.1066 MeV}		(3+)154Ce
Praseodymium-15515559Pr96154.940509(18) u
[154.9081452 u]
{-55.41551 MeV}		(3/2-)155Ce
Praseodymium-15615659Pr97155.94464(21) u
[155.9122762 u]
{-51.56751 MeV}		(1+)156Ce
Praseodymium-15715759Pr98156.94789(32) u
[156.9155262 u]
{-48.54015 MeV}		(3/2-)
Praseodymium-15815859Pr99157.95241(32) u
[157.9200462 u]
{-44.3298 MeV}		(5-)
Praseodymium-15915959Pr100158.95589(43) u
[158.9235262 u]
{-41.0882 MeV}		(3/2-)
Praseodymium-16016059Pr101159.96079(43) u
[159.9284262 u]
{-36.52388 MeV}		(1+)

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Pr-12110 ms (+6-3)p → 120CeAL
Pr-122500~ msβ+ → 122CeAL
Pr-123800~ msβ+ → 123CeAL
Pr-1241.2(2) sEC/β+ → 124Ce
EC, p → 123La		< 100 %
<< 1 %		11.76(50) MeV
AL
Pr-1253.3(7) sEC/β+ → 125Ce
β+, p → 124La		< 100 %
?		8.72(36) MeV
AL
Pr-1263.14(22) sEC/β+ → 126Ce
EC, p → 125La		< 100 %
?		10.50(20) MeV
AL
Pr-1274.2(3) sEC/β+ → 127Ce100 %7.44(20) MeVAL
Pr-127m50 msAL
Pr-1282.84(9) sEC/β+ → 128Ce100 %9.20(4) MeVAL
Pr-12930(4) sEC/β+ → 129Ce100 %6.51(4) MeVAL
Pr-129m1~ msβ+ → 129CeAL
Pr-13040.0(4) sEC/β+ → 130Ce100 %8.25(7) MeVAL
Pr-130m10 sAL
Pr-1311.51(2) minEC/β+ → 131Ce100 %5.41(6) MeVAL
Pr-131m5.73(20) sIso → 131Pr
EC/β+ → 131Ce		96.4(12) %
3.6(12) %
AL
Pr-1321.6(3) minEC/β+ → 132Ce100 %7.24(4) MeVAL
Pr-132m20 sβ+ → 132CeAL
Pr-1336.5(3) minEC/β+ → 133Ce100 %4.481(21) MeVAL
Pr-133m1.1(2) sIso → 133Pr100 %0.192 MeVAL
Pr-13417(2) minEC/β+ → 134Ce100 %6.305(29) MeVAL
Pr-134m11 minEC/β+ → 134Ce100 %AL
Pr-13524(1) minEC/β+ → 135Ce100 %3.680(16) MeVAL
Pr-135m105(10) µsIso → 135Pr100 %AL
Pr-13613.1(1) minEC/β+ → 136Ce100 %5.168(11) MeVAL
Pr-1371.28(3) hEC/β+ → 137Ce100 %2.717(8) MeVAL
Pr-137m2.66(7) μsAL
Pr-1381.45(5) minEC/β+ → 138Ce100 %4.437(12) MeVAL
Pr-138m2.03(2) hEC/β+ → 138Ce100 %AL
Pr-1394.41(4) hEC/β+ → 139Ce100 %2.129(11) MeVAL
Pr-1403.39(1) minEC/β+ → 140Ce100 %3.388(6) MeVAL
Pr-140m10.35(2) μsIso → 140Pr100 %AL
Pr-140m23.05(20) µsIso → 140Pr100 %AL
Pr-141stableAL
Pr-14219.12(4) hβ- → 142Nd
EC → 142Ce		99.9836(8) %
0.0164(8) %		2.1625(14) MeV
0.746(3) MeV		AL
Pr-142m14.6(5) minIso → 142Pr100 %0.004 MeVAL
Pr-14313.57(2) dβ- → 143Nd100 %0.9340(14) MeVAL
Pr-14417.28(5) minβ- → 144Nd100 %2.9974(24) MeVAL
Pr-144m7.2(3) minIso → 144Pr
β- → 144Nd		99.93 %
0.07 %		0.059 MeV
AL
Pr-1455.984(10) hβ- → 145Nd100 %1.806(7) MeVAL
Pr-14624.09(10) minβ- → 146Nd100 %4.24(3) MeVAL
Pr-14713.4(3) minβ- → 147Nd100 %2.703(16) MeVAL
Pr-1482.29(2) minβ- → 148Nd100 %4.873(15) MeVAL
Pr-148m2.01(7) minβ- → 148Nd
Iso → 148Pr		64(10) %
36(10) %
AL
Pr-1492.26(7) minβ- → 149Nd100 %3.336(10) MeVAL
Pr-1506.19(16) sβ- → 150Nd100 %5.379(9) MeVAL
Pr-15118.90(7) sβ- → 151Nd100 %4.163(12) MeVAL
Pr-1523.57(18) sβ- → 152Nd100 %6.93(3) MeVAL
Pr-1534.28(11) sβ- → 153Nd100 %5.762(12) MeVAL
Pr-1542.3(1) sβ- → 154Nd100 %7.72(10) MeVAL
Pr-1551.47(3) sβ- → 155Nd
β-, n → 154Nd		100 %
?		6.868(19) MeV
2.34(6) MeV		AL
Pr-1560.444(6) sβ- → 156Nd
β-, n → 155Nd		100 %
?		8.91(28) MeV
2.64(20) MeV		AL
Pr-157295 msβ- → 157Nd
β-, n → 156Nd		100 %
?		7.92(30) MeV
3.86(36) MeV		AL
Pr-158181(14) msβ- → 158Nd
β-, n → 157Nd		100 %
?		9.72(36) MeV
4.06(30) MeV		AL
Pr-1590.13(4) sβ- → 159Nd
β-, n → 158Nd		100 %
?		8.72(50) MeV
4.89(45) MeV		AL
Pr-1600.17(14) sβ- → 160Nd
β-, n → 159Nd		100 %
?		10.61(50) MeV
5.22(50) 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 Praseodymium 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 Praseodymium 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 Praseodymium 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)
141Pr
100 %
5/2+		+ 4,2757,765
{- 0,0589(42)}		13,03590,33483
3,5720

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 Praseodymium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Pr-136105 Bq10 Bq/g13.1 min
Pr-137106 Bq100 Bq/g76.8 min
Pr-138m106 Bq10 Bq/g2.1 h
Pr-139+107 Bq100 Bq/g4.4 h
Pr-142105 Bq100 Bq/g1 TBq10 Bq cm-219.1 h
Pr-142m109 Bq107 Bq/g14.6 min
Pr-143106 Bq1000 Bq/g30 TBq100 Bq cm-213.6 d
Pr-144105 Bq100 Bq/g17.3 min
Pr-145105 Bq1000 Bq/g6.0 h
Pr-147105 Bq10 Bq/g13.4 min

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

 

Literature Sources and References

Properties of the Praseodymium 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.

Praseodymium: NMR properties - 141Pr-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.

 

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