Isotopes of lutetium
List of isotopes
Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Believed to undergo α decay to ¹⁷¹Tm primordial radionuclide Used in lutetium-hafnium dating

Isotopes of lutetium

Section Title: List of isotopes
Table Section Text: Bold for isotopes with half-lives longer than the age of the universe (nearly stable) Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Believed to undergo α decay to ¹⁷¹Tm primordial radionuclide Used in lutetium-hafnium dating

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)

excitation energy

150Lu	71	79	149.97323(54)#	43(5) ms	p (80%)	149Yb	(2+)

β+ (20%)	150Yb

150mLu	34(15) keV	80(60) µs [30(+95−15) µs]	p	149Yb	(1,2)

151Lu	71	80	150.96757682	80.6(5) ms	p (63.4%)	150Yb	(11/2−)

β+ (36.6%)	151Yb

151mLu	77(5) keV	16(1) µs	p	150Yb	(3/2+)

152Lu	71	81	151.96412(21)#	650(70) ms	β+ (85%)	152Yb	(5−,6−)

β+, p (15%)	151Tm

153Lu	71	82	152.95877(22)	0.9(2) s	α (70%)	149Tm	11/2−

β+ (30%)	153Yb

153m1Lu	80(5) keV	1# s	IT	153Lu	1/2+

153m2Lu	2502.5(4) keV	>0.1 µs	IT	153Lu	23/2−

153m3Lu	2632.9(5) keV	15(3) µs	IT	153m2Lu	27/2−

154Lu	71	83	153.95752(22)#	1# s	β+	154Yb	(2−)

154m1Lu	58(13) keV	1.12(8) s	(9+)

154m2Lu	>2562 keV	35(3) µs	(17+)

155Lu	71	84	154.954316(22)	68.6(16) ms	α (76%)	151Tm	(11/2−)

β+ (24%)	155Yb

155m1Lu	20(6) keV	138(8) ms	α (88%)	151Tm	(1/2+)

β+ (12%)	155Yb

155m2Lu	1781.0(20) keV	2.70(3) ms	(25/2−)

156Lu	71	85	155.95303(8)	494(12) ms	α (95%)	152Tm	(2)−

β+ (5%)	156Yb

156mLu	220(80)# keV	198(2) ms	α (94%)	152Tm	(9)+

β+ (6%)	156Yb

157Lu	71	86	156.950098(20)	6.8(18) s	β+	157Yb	(1/2+,3/2+)

α	153Tm

157mLu	21.0(20) keV	4.79(12) s	β+ (94%)	157Yb	(11/2−)

α (6%)	153Tm

158Lu	71	87	157.949313(16)	10.6(3) s	β+ (99.09%)	158Yb	2−

α (.91%)	154Tm

159Lu	71	88	158.94663(4)	12.1(10) s	β+ (99.96%)	159Yb	1/2+#

α (.04%)	155Tm

159mLu	100(80)# keV	10# s	11/2−#

160Lu	71	89	159.94603(6)	36.1(3) s	β+	160Yb	2−#

α (10−4%)	156Tm

160mLu	0(100)# keV	40(1) s

161Lu	71	90	160.94357(3)	77(2) s	β+	161Yb	1/2+

161mLu	166(18) keV	7.3(4) ms	IT	161Lu	(9/2−)

162Lu	71	91	161.94328(8)	1.37(2) min	β+	162Yb	(1−)

162m1Lu	120(200)# keV	1.5 min	β+	162Yb	4−#

IT (rare)	162Lu

162m2Lu	300(200)# keV	1.9 min

163Lu	71	92	162.94118(3)	3.97(13) min	β+	163Yb	1/2(+)

164Lu	71	93	163.94134(3)	3.14(3) min	β+	164Yb	1(−)

165Lu	71	94	164.939407(28)	10.74(10) min	β+	165Yb	1/2+

166Lu	71	95	165.93986(3)	2.65(10) min	β+	166Yb	(6−)

166m1Lu	34.37(5) keV	1.41(10) min	EC (58%)	166Yb	3(−)

IT (42%)	166Lu

166m2Lu	42.9(5) keV	2.12(10) min	0(−)

167Lu	71	96	166.93827(3)	51.5(10) min	β+	167Yb	7/2+

167mLu	0(30)# keV	>1 min	1/2(−#)

168Lu	71	97	167.93874(5)	5.5(1) min	β+	168Yb	(6−)

168mLu	180(110) keV	6.7(4) min	β+ (95%)	168Yb	3+

IT (5%)	168Lu

169Lu	71	98	168.937651(6)	34.06(5) h	β+	169Yb	7/2+

169mLu	29.0(5) keV	160(10) s	IT	169Lu	1/2−

170Lu	71	99	169.938475(18)	2.012(20) d	β+	170Yb	0+

170mLu	92.91(9) keV	670(100) ms	IT	170Lu	(4)−

171Lu	71	100	170.9379131(30)	8.24(3) d	β+	171Yb	7/2+

171mLu	71.13(8) keV	79(2) s	IT	171Lu	1/2−

172Lu	71	101	171.939086(3)	6.70(3) d	β+	172Yb	4−

172m1Lu	41.86(4) keV	3.7(5) min	IT	172Lu	1−

172m2Lu	65.79(4) keV	0.332(20) µs	(1)+

172m3Lu	109.41(10) keV	440(12) µs	(1)+

172m4Lu	213.57(17) keV	150 ns	(6−)

173Lu	71	102	172.9389306(26)	1.37(1) y	EC	173Yb	7/2+

173mLu	123.672(13) keV	74.2(10) µs	5/2−

174Lu	71	103	173.9403375(26)	3.31(5) y	β+	174Yb	(1)−

174m1Lu	170.83(5) keV	142(2) d	IT (99.38%)	174Lu	6−

EC (.62%)	174Yb

174m2Lu	240.818(4) keV	395(15) ns	(3+)

174m3Lu	365.183(6) keV	145(3) ns	(4−)

175Lu	71	104	174.9407718(23)	Observationally Stable	7/2+	0.9741(2)

175m1Lu	1392.2(6) keV	984(30) µs	(19/2+)

175m2Lu	353.48(13) keV	1.49(7) µs	5/2−

176Lu	71	105	175.9426863(23)	38.5(7)×109 y	β−	176Hf	7−	0.0259(2)

176mLu	122.855(6) keV	3.664(19) h	β− (99.9%)	176Hf	1−

EC (.095%)	176Yb

177Lu	71	106	176.9437581(23)	6.6475(20) d	β−	177Hf	7/2+

177m1Lu	150.3967(10) keV	130(3) ns	9/2−

177m2Lu	569.7068(16) keV	155(7) µs	1/2+

177m3Lu	970.1750(24) keV	160.44(6) d	β− (78.3%)	177Hf	23/2−

IT (21.7%)	177Lu

177m4Lu	3900(10) keV	7(2) min [6(+3−2) min]	39/2−

178Lu	71	107	177.945955(3)	28.4(2) min	β−	178Hf	1(+)

178mLu	123.8(26) keV	23.1(3) min	β−	178Hf	9(−)

179Lu	71	108	178.947327(6)	4.59(6) h	β−	179Hf	7/2(+)

179mLu	592.4(4) keV	3.1(9) ms	IT	179Lu	1/2(+)

180Lu	71	109	179.94988(8)	5.7(1) min	β−	180Hf	5+

180m1Lu	13.9(3) keV	~1 s	IT	180Lu	3−

180m2Lu	624.0(5) keV	>=1 ms	(9−)

181Lu	71	110	180.95197(32)#	3.5(3) min	β−	181Hf	(7/2+)

182Lu	71	111	181.95504(21)#	2.0(2) min	β−	182Hf	(0,1,2)

183Lu	71	112	182.95757(32)#	58(4) s	β−	183Hf	(7/2+)

184Lu	71	113	183.96091(43)#	20(3) s	β−	184Hf	(3+)

Sentence(s)

¹⁷⁴Lu with a half-life of 3.31 years and ¹⁷³Lu with a half-life of 1.37 years.

final_sentence: ¹⁷⁴Lu with a half-life of 3.31 years and ¹⁷³Lu with a half-life of 1.37 years.