Isotopes of terbium
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Fission product

Isotopes of terbium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Fission product

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)

excitation energy

135Tb	65	70	0.94(+33−22) ms	(7/2−)

136Tb	65	71	135.96138(64)#	0.2# s

137Tb	65	72	136.95598(64)#	600# ms	11/2−#

138Tb	65	73	137.95316(43)#	800# ms [>200 ns]	β+	138Gd

p	137Gd

139Tb	65	74	138.94829(32)#	1.6(2) s	β+	139Gd	11/2−#

140Tb	65	75	139.94581(86)	2.4(2) s	β+ (99.74%)	140Gd	5

β+, p (.26%)	139Eu

141Tb	65	76	140.94145(11)	3.5(2) s	β+	141Gd	(5/2−)

141mTb	0(200)# keV	7.9(6) s	β+	141Gd	11/2−#

142Tb	65	77	141.93874(32)#	597(17) ms	β+	142Gd	1+

β+, p	141Eu

142m1Tb	280.2(10) keV	303(17) ms	IT (99.5%)	142Tb	(5−)

β+ (.5%)	142Gd

142m2Tb	621.4(11) keV	15(4) µs

143Tb	65	78	142.93512(6)	12(1) s	β+	143Gd	(11/2−)

143mTb	0(100)# keV	<21 s	β+	143Gd	5/2+#

144Tb	65	79	143.93305(3)	~1 s	β+	144Gd	1+

β+, p (rare)	143Eu

144m1Tb	396.9(5) keV	4.25(15) s	IT (66%)	144Tb	(6−)

β+ (34%)	144Gd

β+, p (<1%)	143Eu

144m2Tb	476.2(5) keV	2.8(3) µs	(8−)

144m3Tb	517.1(5) keV	670(60) ns	(9+)

144m4Tb	544.5(6) keV	<300 ns	(10+)

145Tb	65	80	144.92927(6)	20# min	β+	145Gd	(3/2+)

145mTb	0(100)# keV	30.9(7) s	β+	145Gd	(11/2−)

146Tb	65	81	145.92725(5)	8(4) s	β+	146Gd	1+

146m1Tb	150(100)# keV	24.1(5) s	β+	146Gd	5−

146m2Tb	930(100)# keV	1.18(2) ms	(10+)

147Tb	65	82	146.924045(13)	1.64(3) h	β+	147Gd	1/2+#

147mTb	50.6(9) keV	1.87(5) min	β+	147Gd	(11/2)−

148Tb	65	83	147.924272(15)	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	(27+)

149Tb	65	84	148.923246(5)	4.118(25) h	β+ (83.3%)	149Gd	1/2+

α (16.7%)	145Eu

149mTb	35.78(13) keV	4.16(4) min	β+ (99.97%)	149Gd	11/2−

α (.022%)	145Eu

150Tb	65	85	149.923660(8)	3.48(16) h	β+ (99.95%)	150Gd	(2−)

α (.05%)	146Eu

150mTb	457(29) keV	5.8(2) min	β+	150Gd	9+

IT (rare)	150Tb

151Tb	65	86	150.923103(5)	17.609(1) h	β+ (99.99%)	151Gd	1/2(+)

α (.0095%)	147Eu

151mTb	99.54(6) keV	25(3) s	IT (93.8%)	151Tb	(11/2−)

β+ (6.2%)	151Gd

152Tb	65	87	151.92407(4)	17.5(1) h	β+	152Gd	2−

α (7×10−7%)	148Eu

152m1Tb	342.15(16) keV	0.96 µs	5−

152m2Tb	501.74(19) keV	4.2(1) min	IT (78.8%)	152Tb	8+

β+ (21.2%)	152Gd

153Tb	65	88	152.923435(5)	2.34(1) d	β+	153Gd	5/2+

153mTb	163.175(5) keV	186(4) µs	11/2−

154Tb	65	89	153.92468(5)	21.5(4) h	β+ (99.9%)	154Gd	0(+#)

β− (.1%)	154Dy

154m1Tb	12(7) keV	9.4(4) h	β+ (78.2%)	154Gd	3−

IT (21.8%)	154Tb

β− (.1%)	154Dy

154m2Tb	200(150)# keV	22.7(5) h	7−

154m3Tb	0+Z keV	513(42) ns

155Tb	65	90	154.923505(13)	5.32(6) d	EC	155Gd	3/2+

156Tb	65	91	155.924747(5)	5.35(10) d	β+	156Gd	3−

β− (rare)	156Dy

156m1Tb	54(3) keV	24.4(10) h	IT	156Tb	(7−)

156m2Tb	88.4(2) keV	5.3(2) h	(0+)

157Tb	65	92	156.9240246(27)	71(7) y	EC	157Gd	3/2+

158Tb	65	93	157.9254131(28)	180(11) y	β+ (83.4%)	158Gd	3−

β− (16.6%)	158Dy

158m1Tb	110.3(12) keV	10.70(17) s	IT (99.39%)	158Tb	0−

β− (.6%)	158Dy

β+ (.01%)	158Gd

158m2Tb	388.37(15) keV	0.40(4) ms	7−

159Tb	65	94	158.9253468(27)	Stable	3/2+	1.0000

160Tb	65	95	159.9271676(27)	72.3(2) d	β−	160Dy	3−

161Tb	65	96	160.9275699(28)	6.906(19) d	β−	161Dy	3/2+

162Tb	65	97	161.92949(4)	7.60(15) min	β−	162Dy	1−

163Tb	65	98	162.930648(5)	19.5(3) min	β−	163Dy	3/2+

164Tb	65	99	163.93335(11)	3.0(1) min	β−	164Dy	(5+)

165Tb	65	100	164.93488(21)#	2.11(10) min	β−	165mDy	3/2+#

166Tb	65	101	165.93799(11)	25.6(22) s	β−	166Dy

167Tb	65	102	166.94005(43)#	19.4(27) s	β−	167Dy	3/2+#

168Tb	65	103	167.94364(54)#	8.2(13) s	β−	168Dy	4−#

169Tb	65	104	168.94622(64)#	2# s	β−	169Dy	3/2+#

170Tb	65	105	169.95025(75)#	3# s	β−	170Dy

171Tb	65	106	170.95330(86)#	500# ms	β−	171Dy	3/2+#

Sentence(s)

The ¹⁵⁸Tb has a half-life of 180 years, ¹⁵⁷Tb has 71 years and ¹⁶⁰Tb has 72.3 days.

final_sentence: The ¹⁵⁸Tb has a half-life of 180 years, ¹⁵⁷Tb has 71 years and ¹⁶⁰Tb has 72.3 days.