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Periodic Table of Elements

Tb - Terbium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Tb139	138.948	74	Syn
Tb140	139.946	75	Syn	5	2.4s	ε + P	Eu139	0.26	7.300
					2.4s	P	Gd139	0.26	-0.300
					2.4s	ε	Gd140		10.800
Tb141	140.941	76	Syn	5/2-	3.5s	ε	Gd141		8.300
meta state 0.000MeV			Syn		7.9s	ε	Gd141		8.300
Tb142	141.939	77	Syn	1+	597ms	ε + P	Eu141	~3.0E^-7	6.000
					597ms	ε	Gd142		10.100
meta state 0.280MeV			Syn	5-	303ms	ε	Gd142		10.380
					303ms	ε + P	Eu141		6.280
					303ms	IT			0.280
Tb143	142.935	78	Syn	11/2-	12s	ε	Gd143		7.400
meta state 0.000MeV			Syn	5/2+	<21s	IT	Tb143
Tb144	143.933	79	Syn	1+	~1s	ε	Gd144		8.900
meta state 0.397MeV			Syn	6-	4.25s	IT		66	0.397
					4.25s	ε	Gd144	34	9.297
Tb145	144.929	80	Syn	1/2+		ε	Gd145		6.510
meta state 0.000MeV			Syn	11/2-	29.5s	ε	Gd145		6.700
Tb146	145.9272	81	Syn	1+	8s	ε	Gd146	8.080MeV
meta state 0.000MeV			Syn	5-	23s	ε	Gd146		8.080
meta state 0.780MeV			Syn	10+	1.18ms
Tb147	146.924	82	Syn	1/2+	1.7h	ε	Gd147		4.609
meta state 0.050MeV			Syn	11/2-	1.83m	ε	Gd147		4.660
Tb148	147.9243	83	Syn	2-	60m	ε	Gd148		5.690
meta state 0.090MeV			Syn	9+	2.2m	ε	Gd148		5.780
Tb149	148.9232	84	Syn	1/2+	4.118h	ε	Gd149	83.3	3.636
					4.118h	α	Eu145	16.7	4.077
meta state 0.036MeV			Syn	11/2-	4.16m	ε	Gd149	99.98	3.672
					4.16m	α	Eu145	0.02	4.113
Tb150	149.9237	85	Syn	2-	3.48h	α	Eu146	<0.05	3.587
					3.48h	ε	Gd150		4.656
meta state 0.474MeV			Syn	9+	5.8m	ε	Gd150	~100	5.130
Tb151	150.9231	86	Syn	1/2+	17.609h	α	Eu147	0.0095	3.497
					17.609h	ε	Gd151		2.565
meta state 0.099MeV			Syn	11/2-	25s	IT		93.8	0.100
					25s	ε	Gd151	6.2	2.664
Tb152	151.9241	87	Syn	2-	17.5h	α	Eu148	<7.0E^-7	3.090
					17.5h	ε	Gd152		3.990
meta state 0.501MeV			Syn	8+	4.2m	IT		78.8	0.502
					4.2m	ε	Gd152	21.2	4.492
Tb153	152.9234	88	Syn	5/2+	2.34d	ε	Gd153		1.570
Tb154	153.9247	89	Syn	0	21.5h	β^-	Dy154	<0.1	0.250
					21.5h	ε	Gd154		3.560
meta state 0.000MeV			Syn	7-	22.7h	ε	Gd154	98.2	3.560
					22.7h	IT		1.8
meta state 0.000MeV			Syn	3-	9.4h	ε	Gd154	78.2	3.560
					9.4h	IT		21.8
					9.4h	β^-	Dy154	<0.1	0.250
Tb155	154.9235	90	Syn	3/2+	5.32d	ε	Gd155		0.821
Tb156	155.9247	91	Syn	3-	5.35d	β^-	Dy156		0.434
					5.35d	ε	Gd156		2.444
meta state 0.050MeV			Syn	7-	24.4h	IT			0.050
meta state 0.088MeV			Syn	0+	5.3h	ε	Gd156		2.532
					5.3h	IT			0.088
Tb157	156.924	92	Syn	3/2+	71y	ε	Gd157		0.060
Tb158	157.9254	93	Syn	3-	180y	ε	Gd158	83.4	1.220
					180y	β^-	Dy158	16.6	0.937
meta state 0.110MeV			Syn	0-	10.7s	β^-	Dy158	<0.6	1.047
					10.7s	ε	Gd158	<0.01	1.330
					10.7s	IT			0.110
meta state 0.388MeV			Syn	7-	0.4ms	IT			0.388
Tb159	158.9253	94	100.	3/2+	Stable
Tb160	159.9272	95	Syn	3-	72.3d	β^-	Dy160		1.835
Tb161	160.9276	96	Syn	3/2+	6.88d	β^-	Dy161		0.593
Tb162	161.9295	97	Syn	1-	7.6m	β^-	Dy162		2.510
Tb163	162.9306	98	Syn	3/2+	19.5m	β^-	Dy163		1.785
Tb164	163.933	99	Syn	5+	3m	β^-	Dy164		3.890
Tb165	164.935	100	Syn	3/2+	2.11m	β^-	Dy165		3.000
Tb166	165.938	101	Syn
Tb167	166.94	102	Syn
Tb168		103	Syn
Tb169		104	Syn
Tb170		105	Syn
Tb171		106	Syn

Nuclide	Potential Parent Nuclides
Tb139	None known
Tb140	None known
Tb141	Dy141 (Syn)
meta state 0.000MeV	None known
Tb142	Dy142 (Syn)
meta state 0.280MeV	None known
Tb143	Dy143 (Syn) Ho144 (Syn) Tb143m (Syn)
meta state 0.000MeV	None known
Tb144	Dy144 (Syn)
meta state 0.397MeV	None known
Tb145	Dy145 (Syn) Dy145m (Syn) Ho146 (Syn)
meta state 0.000MeV	None known
Tb146	Dy146 (Syn) Ho147 (Syn)
meta state 0.000MeV	None known
meta state 0.780MeV	None known
Tb147	Dy147 (Syn) Dy147m (Syn) Ho148m (Syn) Ho151 (Syn) Ho151m (Syn)
meta state 0.050MeV	None known
Tb148	Dy148 (Syn) Ho152 (Syn) Ho152m (Syn)
meta state 0.090MeV	None known
Tb149	Dy149 (Syn) Dy149m (Syn) Ho153 (Syn) Ho153m (Syn)
meta state 0.036MeV	None known
Tb150	Dy150 (Syn) Ho154 (Syn) Ho154m (Syn)
meta state 0.474MeV	None known
Tb151	Dy151 (Syn)
meta state 0.099MeV	None known
Tb152	Dy152 (Syn)
meta state 0.501MeV	None known
Tb153	Dy153 (Syn)
Tb154	None known
meta state 0.000MeV	None known
meta state 0.000MeV	None known
Tb155	Dy155 (Syn)
Tb156	None known
meta state 0.050MeV	None known
meta state 0.088MeV	None known
Tb157	Dy157 (Syn)
Tb158	None known
meta state 0.110MeV	None known
meta state 0.388MeV	None known
Tb159	Dy159 (Syn) Gd159 (Syn)
Tb160	None known
Tb161	Gd161 (Syn)
Tb162	Gd162 (Syn)
Tb163	Gd163 (Syn)
Tb164	Gd164 (Syn)
Tb165	None known
Tb166	None known
Tb167	None known
Tb168	None known
Tb169	None known
Tb170	None known
Tb171	None known
Key: NN = Number of Neutrons Abun % = Natural Abundance (as a percentage) Syn = Synthetic Nuclide (does not occur in nature) DM = Decay Mode α = Alpha emission β^- = Beta emission β^- β^- = Double beta decay β⁺ = Positron emission ε = Electron Capture IT = Isomeric Transition N = Neutron emission P = Proton emission SF = Spontaneous Fission DT = Decays To BR % = Branch Ratio (as a percentage)

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Periodic Table of Elements

Tb - Terbium

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