Isotopes of thulium
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Believed to undergo α decay to ¹⁶⁵Ho

Isotopes of thulium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Believed to undergo α decay to ¹⁶⁵Ho

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

145Tm	69	76	144.97007(43)#	3.1(3) µs	(11/2−)

146Tm	69	77	145.96643(43)#	240(30) ms	p	145Er	(6−)

β+ (rare)	146Er

146mTm	71(6) keV	72(23) ms	p	145Er	(10+)

β+ (rare)	146Er

147Tm	69	78	146.96096(32)#	0.58(3) s	β+ (85%)	147Er	11/2−

p (15%)	146Er

147mTm	60(5) keV	360(40) µs	3/2+

148Tm	69	79	147.95784(43)#	0.7(2) s	β+	148Er	(10+)

148mTm	0.7 s

149Tm	69	80	148.95272(32)#	0.9(2) s	β+ (99.74%)	149Er	(11/2−)

β+, p (.26%)	148Ho

150Tm	69	81	149.94996(21)#	3# s	β+	150Er	(1+)

150m1Tm	140(140)# keV	2.20(6) s	β+ (98.8%)	150Er	(6−)

β+, p (1.2%)	149Ho

150m2Tm	810(140)# keV	5.2(3) ms	(10+)

151Tm	69	82	150.945483(22)	4.17(10) s	β+	151Er	(11/2−)

151m1Tm	92(7) keV	6.6(14) s	β+	151Er	(1/2+)

151m2Tm	2655.67(22) keV	451(24) ns	(27/2−)

152Tm	69	83	151.94442(8)	8.0(10) s	β+	152Er	(2#)−

152m1Tm	100(80)# keV	5.2(6) s	β+	152Er	(9)+

152m2Tm	2555.05(19)+X keV	294(12) ns	(17+)

153Tm	69	84	152.942012(20)	1.48(1) s	α (91%)	149Ho	(11/2−)

β+ (9%)	153Er

153mTm	43.2(2) keV	2.5(2) s	α (92%)	149Ho	(1/2+)

β+ (8%)	153Er

154Tm	69	85	153.941568(15)	8.1(3) s	β+ (56%)	154Er	(2−)

α (44%)	150Ho

154mTm	70(50) keV	3.30(7) s	α (90%)	150Ho	(9+)

β+ (10%)	154Er

155Tm	69	86	154.939199(14)	21.6(2) s	β+ (98.1%)	155Er	(11/2−)

α (1.9%)	151Ho

155mTm	41(6) keV	45(3) s	β+ (92%)	155Er	(1/2+)

α (8%)	151Ho

156Tm	69	87	155.938980(17)	83.8(18) s	β+ (99.93%)	156Er	2−

α (.064%)	152Er

156mTm	203.6(5) keV	~400 ns	(11−)

157Tm	69	88	156.93697(3)	3.63(9) min	β+	157Er	1/2+

158Tm	69	89	157.936980(27)	3.98(6) min	β+	158Er	2−

158mTm	50(100)# keV	~20 ns	(5+)

159Tm	69	90	158.93498(3)	9.13(16) min	β+	159Er	5/2+

160Tm	69	91	159.93526(4)	9.4(3) min	β+	160Er	1−

160m1Tm	70(20) keV	74.5(15) s	IT (85%)	160Tm	5(+#)

β+ (15%)	160Er

160m2Tm	98.2+X keV	~200 ns	(8)

161Tm	69	92	160.93355(3)	30.2(8) min	β+	161Er	7/2+

161m1Tm	7.4(2) keV	5# min	1/2+

161m2Tm	78.20(3) keV	110(3) ns	7/2−

162Tm	69	93	161.933995(28)	21.70(19) min	β+	162Er	1−

162mTm	130(40) keV	24.3(17) s	IT (82%)	162Tm	5+

β+ (18%)	162Er

163Tm	69	94	162.932651(6)	1.810(5) h	β+	163Er	1/2+

164Tm	69	95	163.93356(3)	2.0(1) min	β+	164Er	1+

164mTm	10(6) keV	5.1(1) min	IT (80%)	164Tm	6−

β+ (20%)	164Er

165Tm	69	96	164.932435(4)	30.06(3) h	β+	165Er	1/2+

166Tm	69	97	165.933554(13)	7.70(3) h	β+	166Er	2+

166mTm	122(8) keV	340(25) ms	IT	166Tm	6−

167Tm	69	98	166.9328516(29)	9.25(2) d	EC	167Er	1/2+

167m1Tm	179.480(19) keV	1.16(6) µs	(7/2)+

167m2Tm	292.820(20) keV	0.9(1) µs	7/2−

168Tm	69	99	167.934173(3)	93.1(2) d	β+ (99.99%)	168Er	3+

β− (.01%)	168Yb

169Tm	69	100	168.9342133(27)	Observationally Stable	1/2+	1.0000

170Tm	69	101	169.9358014(27)	128.6(3) d	β− (99.86%)	170Yb	1−

EC (.14%)	170Er

170mTm	183.197(4) keV	4.12(13) µs	(3)+

171Tm	69	102	170.9364294(28)	1.92(1) y	β−	171Yb	1/2+

171mTm	424.9560(15) keV	2.60(2) µs	7/2−

172Tm	69	103	171.938400(6)	63.6(2) h	β−	172Yb	2−

173Tm	69	104	172.939604(5)	8.24(8) h	β−	173Yb	(1/2+)

173mTm	317.73(20) keV	10(3) µs	(7/2−)

174Tm	69	105	173.94217(5)	5.4(1) min	β−	174Yb	(4)−

175Tm	69	106	174.94384(5)	15.2(5) min	β−	175Yb	(1/2+)

176Tm	69	107	175.94699(11)	1.85(3) min	β−	176Yb	(4+)

177Tm	69	108	176.94904(32)#	90(6) s	β−	177Yb	(7/2−)

178Tm	69	109	177.95264(43)#	30# s	β−	178Yb

179Tm	69	110	178.95534(54)#	20# s	β−	179Yb	1/2+#

Sentence(s)

The isotopes of thulium range in atomic weight from 144.97007 u (¹⁴⁵Tm) to 178.95534 u (¹⁷⁹Tm).

final_sentence: The isotopes of thulium range in atomic weight from 144.97007 u (¹⁴⁵Tm) to 178.95534 u (¹⁷⁹Tm).