Isotopes of holmium
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes Believed to undergo α decay to ¹⁶¹Tb

Isotopes of holmium

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 ¹⁶¹Tb

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

140Ho	67	73	139.96854(54)#	6(3) ms	8+#

141Ho	67	74	140.96310(54)#	4.1(3) ms	(7/2−)

141mHo	66(2) keV	6.4(8) µs	(1/2+)

142Ho	67	75	141.95977(54)#	400(100) ms	β+	142Dy	(6 to 9)

p	141Dy

143Ho	67	76	142.95461(43)#	300# ms [>200 ns]	β+	143Dy	11/2−#

144Ho	67	77	143.95148(32)#	0.7(1) s	β+	144Dy

β+, p	143Tb

145Ho	67	78	144.94720(32)#	2.4(1) s	β+	145Dy	(11/2−)

145mHo	100(100)# keV	100# ms	5/2+#

146Ho	67	79	145.94464(21)#	3.6(3) s	β+	146Dy	(10+)

β+, p (rare)	145Tb

147Ho	67	80	146.94006(3)	5.8(4) s	β+	147Dy	(11/2−)

β+, p (rare)	146Tb

148Ho	67	81	147.93772(14)	2.2(11) s	β+	148Dy	(1+)

148m1Ho	400(100)# keV	9.49(12) s	β+ (99.92%)	148Dy	(6)−

β+, p (.08%)	147Tb

148m2Ho	690(100)# keV	2.35(4) ms	(10+)

149Ho	67	82	148.933775(20)	21.1(2) s	β+	149Dy	(11/2−)

149m1Ho	48.80(20) keV	56(3) s	β+	149Dy	(1/2+)

149m2Ho	7200(350) keV	>=100 ns

150Ho	67	83	149.933496(15)	76.8(18) s	β+	150Dy	2−

150m1Ho	10(50) keV	23.3(3) s	β+	150Dy	(9)+

150m2Ho	~8000 keV	751 ns

151Ho	67	84	150.931688(13)	35.2(1) s	β+ (78%)	151Dy	11/2(−)

α (22%)	147Tb

151mHo	41.0(2) keV	47.2(10) s	α (77%)	147Tb	1/2(+)

β+ (22%)	151Dy

152Ho	67	85	151.931714(15)	161.8(3) s	β+ (88%)	152Dy	2−

α (12%)	148Tb

152m1Ho	160(1) keV	50.0(4) s	9+

152m2Ho	3019.59(19) keV	8.4(3) µs	19−

153Ho	67	86	152.930199(6)	2.01(3) min	β+ (99.94%)	153Dy	11/2−

α (.05%)	149Tb

153m1Ho	68.7(3) keV	9.3(5) min	β+ (99.82%)	153Dy	1/2+

α (.18%)	149Tb

153m2Ho	2772 keV	229(2) ns	(31/2+)

154Ho	67	87	153.930602(9)	11.76(19) min	β+ (99.98%)	154Dy	2−

α (.02%)	150Tb

154mHo	238(30) keV	3.10(14) min	β+ (99.99%)	154Dy	8+

α (.001%)	150Tb

IT (rare)	154Ho

155Ho	67	88	154.929103(19)	48(1) min	β+	155Dy	5/2+

155mHo	141.97(11) keV	880(80) µs	11/2−

156Ho	67	89	155.92984(5)	56(1) min	β+	156Dy	4−

156m1Ho	100(50)# keV	7.8(3) min	β+	156Dy	(9+)

IT	156Ho

156m2Ho	52.4(5) keV	9.5(15) s	1−

157Ho	67	90	156.928256(26)	12.6(2) min	β+	157Dy	7/2−

158Ho	67	91	157.928941(29)	11.3(4) min	β+ (93%)	158Dy	5+

α (7%)	154Tb

158m1Ho	67.200(10) keV	28(2) min	IT (81%)	158Ho	2−

β+ (19%)	158Dy

158m2Ho	180(70)# keV	21.3(23) min	(9+)

159Ho	67	92	158.927712(4)	33.05(11) min	β+	159Dy	7/2−

159mHo	205.91(5) keV	8.30(8) s	IT	159Ho	1/2+

160Ho	67	93	159.928729(16)	25.6(3) min	β+	160Dy	5+

160m1Ho	59.98(3) keV	5.02(5) h	IT (65%)	160Ho	2−

β+ (35%)	160Dy

160m2Ho	197(16) keV	3 s	(9+)

161Ho	67	94	160.927855(3)	2.48(5) h	EC	161Dy	7/2−

161mHo	211.16(3) keV	6.76(7) s	IT	161Ho	1/2+

162Ho	67	95	161.929096(4)	15.0(10) min	β+	162Dy	1+

162mHo	106(7) keV	67.0(7) min	IT (62%)	162Ho	6−

β+ (38%)	162Dy

163Ho	67	96	162.9287339(27)	4570(25) y	EC	163Dy	7/2−

163mHo	297.88(7) keV	1.09(3) s	IT	163Ho	1/2+

164Ho	67	97	163.9302335(30)	29(1) min	EC (60%)	164Dy	1+

β− (40%)	164Er

164mHo	139.77(8) keV	38.0(10) min [37.5(+15−5) min]	IT	164Ho	6−

165Ho	67	98	164.9303221(27)	Observationally Stable	7/2−	1.0000

166Ho	67	99	165.9322842(27)	26.83(2) h	β−	166Er	0−

166m1Ho	5.985(18) keV	1,200(180) y	β−	166Er	(7)−

166m2Ho	190.9052(20) keV	185(15) µs	3+

167Ho	67	100	166.933133(6)	3.003(18) h	β−	167Er	7/2−

167mHo	259.34(11) keV	6.0(10) µs	3/2+

168Ho	67	101	167.93552(3)	2.99(7) min	β−	168Er	3+

168m1Ho	59(1) keV	132(4) s	IT (99.5%)	168Ho	(6+)

β− (.5%)	168Er

168m2Ho	143.4(2) keV	>4 µs	(1)−

168m3Ho	192.6(2) keV	108(11) ns	1+

169Ho	67	102	168.936872(22)	4.72(10) min	β−	169Er	7/2−

170Ho	67	103	169.93962(5)	2.76(5) min	β−	170Er	6+#

170mHo	120(70) keV	43(2) s	β−	170Er	(1+)

171Ho	67	104	170.94147(64)	53(2) s	β−	171Er	7/2−#

172Ho	67	105	171.94482(43)#	25(3) s	β−	172Er

173Ho	67	106	172.94729(43)#	10# s	β−	173Er	7/2−#

174Ho	67	107	173.95115(54)#	8# s

175Ho	67	108	174.95405(64)#	5# s	7/2−#

Sentence(s)

Natural holmium (₆₇Ho) contains one stable isotope, ¹⁶⁵Ho.

final_sentence: Natural holmium (₆₇Ho) contains one stable isotope, ¹⁶⁵Ho.