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Isotopes of terbium

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Main isotopes^[1]			Decay
Isotope	abundance	half-life(t_1/2)	mode	product
¹⁵⁷Tb	synth	71 y	ε	¹⁵⁷Gd
¹⁵⁸Tb	synth	180 y	ε	¹⁵⁸Gd
¹⁵⁸Tb	synth	180 y	β⁻	¹⁵⁸Dy
¹⁵⁹Tb	100%	stable
¹⁶⁰Tb	synth	72.3 d	β⁻	¹⁶⁰Dy
¹⁶¹Tb	synth	6.948 d	β⁻	¹⁶¹Dy

Standard atomic weightA_r°(Tb)

158.925354±0.000007^[2]
158.93±0.01 (abridged)^[3]

Naturally occurringterbium (₆₅Tb) is composed of one stableisotope,¹⁵⁹Tb. Thirty-sevenradioisotopes have been characterized, with the most stable being¹⁵⁸Tb with ahalf-life of 180 years,¹⁵⁷Tb with a half-life of 71 years, and¹⁶⁰Tb with a half-life of 72.3 days. All of the remainingradioactive isotopes have half-lives that are less than one week, and the majority of these have half-lives that are less than 24 seconds. This element also has 27meta states, with the most stable being^156m2Tb (t_1/2 = 24.4 hours),^154m2Tb (t_1/2 = 22.7 hours) and^154m1Tb (t_1/2 = 21.5 hours).

The primarydecay mode before the most abundant stable isotope,¹⁵⁹Tb, iselectron capture togadolinium isotopes, and the primary mode after isbeta decay todysprosium isotopes.

List of isotopes

[edit]

Nuclide ^{[n 1]}	Z	N	Isotopic mass(Da)^[4] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity^[1] ^{[n 8]}^{[n 4]}	Isotopic abundance
Nuclide ^{[n 1]}	Excitation energy^{[n 4]}			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity^[1] ^{[n 8]}^{[n 4]}	Isotopic abundance
¹³⁵Tb	65	70	134.96452(43)#	1.01(28) ms	p	¹³⁴Gd	(7/2−)
¹³⁹Tb	65	74	138.94833(32)#	1.6(2) s	β⁺	¹³⁹Gd	5/2−#
¹⁴⁰Tb	65	75	139.94581(86)	2.29(15) s	β⁺ (99.74%)	¹⁴⁰Gd	(7+)
					EC (<3%)	¹⁴⁰Gd
					β⁺, p (0.26%)	¹³⁹Eu
¹⁴¹Tb	65	76	140.94145(11)	3.5(2) s	β⁺	¹⁴¹Gd	(5/2−)
^141mTb^{[n 9]}^{[n 10]}	0(200)# keV			7.9(6) s	β⁺	¹⁴¹Gd	11/2−#
¹⁴²Tb	65	77	141.93928(75)	597(17) ms	β⁺ (96.8%)	¹⁴²Gd	1+
					EC (3.2%)	¹⁴²Gd
					β⁺, p (0.0022%)	¹⁴¹Eu
^142m1Tb	279.7(4) keV			303(17) ms	IT	¹⁴²Tb	5−
^142m2Tb	652.1(6) keV			26(1) μs	IT	¹⁴²Tb	8+
¹⁴³Tb	65	78	142.935137(55)	12(1) s	β⁺	¹⁴³Gd	(11/2−)
^143mTb^{[n 9]}	0(100)# keV			17(4) s			5/2+#
¹⁴⁴Tb	65	79	143.933045(30)	~1 s	β⁺	¹⁴⁴Gd	1+
^144m1Tb	396.9(5) keV			4.25(15) s	IT (66%)	¹⁴⁴Tb	6−
^144m1Tb	396.9(5) keV			4.25(15) s	β⁺ (34%)	¹⁴⁴Gd	6−
^144m2Tb	476.2(5) keV			2.8(3) μs	IT	¹⁴⁴Tb	(8−)
^144m3Tb	517.1(5) keV			670(60) ns	IT	¹⁴⁴Tb	(9+)
^144m4Tb	544.5(6) keV			<300 ns	IT	¹⁴⁴Tb	(10+)
¹⁴⁵Tb	65	80	144.92872(12)	30.9(6) s	β⁺	¹⁴⁵Gd	(11/2−)
^145mTb^{[n 9]}	860(230) keV						(3/2+)
¹⁴⁶Tb	65	81	145.927253(48)	8(4) s	β⁺	¹⁴⁶Gd	1+
^146m1Tb^{[n 9]}	150(100)# keV			24.1(5) s	β⁺	¹⁴⁶Gd	5−
^146m2Tb	930(100)# keV			1.18(2) ms	IT	¹⁴⁶Tb	10+
¹⁴⁷Tb	65	82	146.9240546(87)	1.64(3) h	β⁺	¹⁴⁷Gd	(1/2+)
^147mTb	50.6(9) keV			1.87(5) min	β⁺	¹⁴⁷Gd	(11/2−)
¹⁴⁸Tb	65	83	147.924275(13)	60(1) min	β⁺	¹⁴⁸Gd	2−
^148m1Tb	90.1(3) keV			2.20(5) min	β⁺	¹⁴⁸Gd	(9)+
^148m2Tb	8618.6(10) keV			1.310(7) μs	IT	¹⁴⁸Tb	(27+)
¹⁴⁹Tb	65	84	148.9232538(39)	4.118(25) h	β⁺ (83.3%)	¹⁴⁹Gd	1/2+
¹⁴⁹Tb	65	84	148.9232538(39)	4.118(25) h	α (16.7%)	¹⁴⁵Eu	1/2+
^149mTb	35.78(13) keV			4.16(4) min	β⁺ (99.98%)	¹⁴⁹Gd	11/2−
^149mTb	35.78(13) keV			4.16(4) min	α (0.022%)	¹⁴⁵Eu	11/2−
¹⁵⁰Tb	65	85	149.9236648(79)	3.48(16) h	β⁺	¹⁵⁰Gd	(2)−
^150mTb	461(27) keV			5.8(2) min	β⁺	¹⁵⁰Gd	9+
¹⁵¹Tb	65	86	150.9231090(44)	17.609(1) h	β⁺ (99.99%)	¹⁵¹Gd	1/2+
¹⁵¹Tb	65	86	150.9231090(44)	17.609(1) h	α (0.0095%)	¹⁴⁷Eu	1/2+
^151mTb	99.53(5) keV			25(3) s	IT (93.4%)	¹⁵¹Tb	11/2−
^151mTb	99.53(5) keV			25(3) s	β⁺ (6.6%)	¹⁵¹Gd	11/2−
¹⁵²Tb	65	87	151.924082(43)	17.8784(95) h^[5]	EC (83%)^[5]	¹⁵²Gd	2−
					β⁺ (17%)^[5]	¹⁵²Gd
					α (<7×10⁻⁷%)^[6]	¹⁴⁸Eu
^152m1Tb	342.15(16) keV			960(10) ns	IT	¹⁵²Tb	5−
^152m2Tb	501.74(19) keV			4.2(1) min	IT (78.9%)	¹⁵²Tb	8+
^152m2Tb	501.74(19) keV			4.2(1) min	β⁺ (21.1%)	¹⁵²Gd	8+
¹⁵³Tb	65	88	152.9234417(42)	2.34(1) d	β⁺	¹⁵³Gd	5/2+
^153mTb	163.175(5) keV			186(4) μs	IT	¹⁵³Tb	11/2−
¹⁵⁴Tb	65	89	153.924684(49)	9.994(39) h	β⁺	¹⁵⁴Gd	3−
^154m1Tb^{[n 9]}	130(50)# keV			21.5(4) h	β⁺	¹⁵⁴Gd	0−
^154m2Tb^{[n 9]}	200(150)# keV			22.7(5) h	β⁺	¹⁵⁴Gd	7−
^154m3Tb	405(150)# keV			513(42) ns	IT	¹⁵⁴Tb
¹⁵⁵Tb	65	90	154.923510(11)	5.2346(36) d^[7]	EC	¹⁵⁵Gd	3/2+
¹⁵⁶Tb	65	91	155.9247542(40)	5.35(10) d	β⁺	¹⁵⁶Gd	3−
^156m1Tb	88.4(2) keV			5.3(2) h	IT	¹⁵⁶Tb	(0+)
^156m2Tb	100(50)# keV			24.4(10) h	IT	¹⁵⁶Tb	(7−)
¹⁵⁷Tb	65	92	156.9240319(11)	71(7) y	EC	¹⁵⁷Gd	3/2+
¹⁵⁸Tb	65	93	157.9254199(14)	180(11) y	β⁺ (83.4%)	¹⁵⁸Gd	3−
¹⁵⁸Tb	65	93	157.9254199(14)	180(11) y	β⁻ (16.6%)	¹⁵⁸Dy	3−
^158m1Tb	110.3(12) keV			10.70(17) s	IT	¹⁵⁸Tb	0−
^158m2Tb	388.39(11) keV			0.40(4) ms	IT	¹⁵⁸Tb	7−
¹⁵⁹Tb^{[n 11]}	65	94	158.9253537(12)	Stable			3/2+	1.0000
¹⁶⁰Tb	65	95	159.9271746(12)	72.3(2) d	β⁻	¹⁶⁰Dy	3−
¹⁶¹Tb^{[n 11]}	65	96	160.9275768(13)	6.948(5) d	β⁻	¹⁶¹Dy	3/2+
¹⁶²Tb	65	97	161.9292754(22)	7.60(15) min	β⁻	¹⁶²Dy	(1−)
^162mTb	286(3) keV			10# min			4−#
¹⁶³Tb	65	98	162.9306536(44)	19.5(3) min	β⁻	¹⁶³Dy	3/2+
¹⁶⁴Tb	65	99	163.9333276(20)	3.0(1) min	β⁻	¹⁶⁴Dy	(5+)
^164mTb	145(12) keV			2# min			2+#
¹⁶⁵Tb	65	100	164.9349552(17)	2.11(10) min	β⁻	¹⁶⁵Dy	(3/2+)
^165mTb	207(5) keV			0.81(8) μs	IT	¹⁶⁵Tb	(7/2−)
¹⁶⁶Tb	65	101	165.9379397(16)	27.1(15) s	β⁻	¹⁶⁶Dy	(1−)
^166mTb	159.0(15) keV			3.5(4) μs	IT	¹⁶⁶Tb	4−#
¹⁶⁷Tb	65	102	166.9400070(21)	18.9(16) s	β⁻	¹⁶⁷Dy	(3/2+)
^167mTb	200(6) keV			1.2(1) μs	IT	¹⁶⁷Tb	(7/2−)
¹⁶⁸Tb	65	103	167.9433371(45)	9.4(4) s	β⁻	¹⁶⁸Dy	(4−)
^168mTb	211(1) keV			0.71(3) μs	IT	¹⁶⁸Tb	(6+)
¹⁶⁹Tb	65	104	168.94581(32)#	5.13(32) s	β⁻	¹⁶⁹Dy	3/2+#
¹⁷⁰Tb	65	105	169.94986(32)#	960(78) ms	β⁻	¹⁷⁰Dy	2−#
¹⁷¹Tb	65	106	170.95301(43)#	1.23(10) s	β⁻	¹⁷¹Dy	3/2+#
¹⁷²Tb	65	107	171.95739(54)#	760(190) ms	β⁻	¹⁷²Dy	6+#
¹⁷³Tb	65	108	172.96081(54)#	400# ms [>550 ns]			3/2+#
¹⁷⁴Tb	65	109	173.96568(54)#	240# ms [>550 ns]			2−#
This table header & footer: view

^^mTb – Excitednuclear isomer.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^^a ^b ^c# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^Modes of decay:
EC: Electron capture

IT: Isomeric transition

p: Proton emission
^Bold italics symbol as daughter – Daughter product is nearly stable.
^Bold symbol as daughter – Daughter product is stable.
^( ) spin value – Indicates spin with weak assignment arguments.
^^a ^b ^c ^d ^e ^fOrder of ground state and isomer is uncertain.
^Discovery of this isotope is disputed.
^^a ^bFission product

References

[edit]

^^a ^b ^c ^dKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3) 030001.doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Terbium".CIAAW. 2021.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04)."Standard atomic weights of the elements 2021 (IUPAC Technical Report)".Pure and Applied Chemistry.doi:10.1515/pac-2019-0603.ISSN 1365-3075.
^Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*".Chinese Physics C.45 (3) 030003.doi:10.1088/1674-1137/abddaf.
^^a ^b ^cCollins, S.M.; Köster, U.; Robinson, A.P.; Ivanov, P.; Cocolios, T.E.; Russell, B.; Fenwick, A.J.; Bernerd, C.; Stegemann, S.; Johnston, K.; Gerami, A.M.; Chrysalidis, K.; Mohamud, H.; Ramirez, N.; Bhaisare, A.; Mewburn-Crook, J.; Cullen, D.M.; Pietras, B.; Pells, S.; Dockx, K.; Stucki, N.; Regan, P.H. (2023)."Determination of the Terbium-152 half-life from mass-separated samples from CERN-ISOLDE and assessment of the radionuclide purity".Applied Radiation and Isotopes.202 111044. Elsevier BV.Bibcode:2023AppRI.20211044C.doi:10.1016/j.apradiso.2023.111044.ISSN 0969-8043.PMID 37797447.
^"Adopted Levels for¹⁵²Tb". NNDC Chart of Nuclides.
^Collins, S.M.; Robinson, A.P.; Ivanov, P.; Köster, U.; Cocolios, T.E.; Russell, B.; Webster, B.; Fenwick, A.J.; Duchemin, C.; Ramos, J.P.; Chevallay, E.; Jakobsson, U.; Stegemann, S.; Regan, P.H.; Stora, T. (2022)."Half-life determination of 155Tb from mass-separated samples produced at CERN-MEDICIS".Applied Radiation and Isotopes.190 110480.doi:10.1016/j.apradiso.2022.110480.PMID 36209648.

Isotopes of thechemical elements

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period	Hydrogen and alkali metals	Alkaline earth metals													Pnictogens	Chalcogens	Halogens	Noble gases
①	Isotopes § List H 1																	Isotopes § List He 2
②	Isotopes § List Li 3	Isotopes § List Be 4											Isotopes § List B 5	Isotopes § List C 6	Isotopes § List N 7	Isotopes § List O 8	Isotopes § List F 9	Isotopes § List Ne 10
③	Isotopes § List Na 11	Isotopes § List Mg 12											Isotopes § List Al 13	Isotopes § List Si 14	Isotopes § List P 15	Isotopes § List S 16	Isotopes § List Cl 17	Isotopes § List Ar 18
④	Isotopes § List K 19	Isotopes § List Ca 20	Isotopes § List Sc 21	Isotopes § List Ti 22	Isotopes § List V 23	Isotopes § List Cr 24	Isotopes § List Mn 25	Isotopes § List Fe 26	Isotopes § List Co 27	Isotopes § List Ni 28	Isotopes § List Cu 29	Isotopes § List Zn 30	Isotopes § List Ga 31	Isotopes § List Ge 32	Isotopes § List As 33	Isotopes § List Se 34	Isotopes § List Br 35	Isotopes § List Kr 36
⑤	Isotopes § List Rb 37	Isotopes § List Sr 38	Isotopes § List Y 39	Isotopes § List Zr 40	Isotopes § List Nb 41	Isotopes § List Mo 42	Isotopes § List Tc 43	Isotopes § List Ru 44	Isotopes § List Rh 45	Isotopes § List Pd 46	Isotopes § List Ag 47	Isotopes § List Cd 48	Isotopes § List In 49	Isotopes § List Sn 50	Isotopes § List Sb 51	Isotopes § List Te 52	Isotopes § List I 53	Isotopes § List Xe 54
⑥	Isotopes § List Cs 55	Isotopes § List Ba 56	Isotopes § List Lu 71	Isotopes § List Hf 72	Isotopes § List Ta 73	Isotopes § List W 74	Isotopes § List Re 75	Isotopes § List Os 76	Isotopes § List Ir 77	Isotopes § List Pt 78	Isotopes § List Au 79	Isotopes § List Hg 80	Isotopes § List Tl 81	Isotopes § List Pb 82	Isotopes § List Bi 83	Isotopes § List Po 84	Isotopes § List At 85	Isotopes § List Rn 86
⑦	Isotopes § List Fr 87	Isotopes § List Ra 88	Isotopes § List Lr 103	Isotopes § List Rf 104	Isotopes § List Db 105	Isotopes § List Sg 106	Isotopes § List Bh 107	Isotopes § List Hs 108	Isotopes § List Mt 109	Isotopes § List Ds 110	Isotopes § List Rg 111	Isotopes § List Cn 112	Isotopes § List Nh 113	Isotopes § List Fl 114	Isotopes § List Mc 115	Isotopes § List Lv 116	Isotopes § List Ts 117	Isotopes § List Og 118
⑧	Isotopes § List Uue 119	Isotopes § List Ubn 120

			Isotopes § List La 57	Isotopes § List Ce 58	Isotopes § List Pr 59	Isotopes § List Nd 60	Isotopes § List Pm 61	Isotopes § List Sm 62	Isotopes § List Eu 63	Isotopes § List Gd 64	Isotopes § List Tb 65	Isotopes § List Dy 66	Isotopes § List Ho 67	Isotopes § List Er 68	Isotopes § List Tm 69	Isotopes § List Yb 70
			Isotopes § List Ac 89	Isotopes § List Th 90	Isotopes § List Pa 91	Isotopes § List U 92	Isotopes § List Np 93	Isotopes § List Pu 94	Isotopes § List Am 95	Isotopes § List Cm 96	Isotopes § List Bk 97	Isotopes § List Cf 98	Isotopes § List Es 99	Isotopes § List Fm 100	Isotopes § List Md 101	Isotopes § List No 102

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