Isotopes of dysprosium
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Believed to undergo α decay to ¹⁵²Gd or β⁺β⁺ decay to ¹⁵⁶Gd with a half-life over 10¹⁸ years Believed to undergo α decay to ¹⁵⁴Gd or β⁺β⁺ decay to ¹⁵⁸Gd Believed to undergo α decay to ¹⁵⁶Gd Believed to undergo α decay to ¹⁵⁷Gd Believed to undergo α decay to ¹⁵⁸Gd Can undergo bound-state β− decay to ¹⁶³Ho with a half-life of 47 days when fully ionized Heaviest theoretically stable nuclide

Isotopes of dysprosium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Believed to undergo α decay to ¹⁵²Gd or β⁺β⁺ decay to ¹⁵⁶Gd with a half-life over 10¹⁸ years Believed to undergo α decay to ¹⁵⁴Gd or β⁺β⁺ decay to ¹⁵⁸Gd Believed to undergo α decay to ¹⁵⁶Gd Believed to undergo α decay to ¹⁵⁷Gd Believed to undergo α decay to ¹⁵⁸Gd Can undergo bound-state β− decay to ¹⁶³Ho with a half-life of 47 days when fully ionized Heaviest theoretically stable nuclide

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

138Dy	66	72	137.96249(64)#	200# ms	0+

139Dy	66	73	138.95954(54)#	600(200) ms	7/2+#

140Dy	66	74	139.95401(54)#	700# ms	β+	140Tb	0+

140mDy	2166.1(5) keV	7.0(5) µs	(8−)

141Dy	66	75	140.95135(32)#	0.9(2) s	β+	141Tb	(9/2−)

β+, p (rare)	140Gd

142Dy	66	76	141.94637(39)#	2.3(3) s	β+ (99.94%)	142Tb	0+

β+, p (.06%)	141Gd

143Dy	66	77	142.94383(21)#	5.6(10) s	β+	143Tb	(1/2+)

β+, p (rare)	142Gd

143mDy	310.7(6) keV	3.0(3) s	(11/2−)

144Dy	66	78	143.93925(3)	9.1(4) s	β+	144Tb	0+

β+, p (rare)	143Gd

145Dy	66	79	144.93743(5)	9.5(10) s	β+	145Tb	(1/2+)

β+, p (rare)	144Gd

145mDy	118.2(2) keV	14.1(7) s	β+	145Tb	(11/2−)

146Dy	66	80	145.932845(29)	33.2(7) s	β+	146Tb	0+

146mDy	2935.7(6) keV	150(20) ms	IT	146Dy	(10+)#

147Dy	66	81	146.931092(21)	40(10) s	β+ (99.95%)	147Tb	1/2+

β+, p (.05%)	146Tb

147m1Dy	750.5(4) keV	55(1) s	β+ (65%)	147Tb	11/2−

IT (35%)	147Dy

147m2Dy	3407.2(8) keV	0.40(1) µs	(27/2−)

148Dy	66	82	147.927150(11)	3.3(2) min	β+	148Tb	0+

149Dy	66	83	148.927305(9)	4.20(14) min	β+	149Tb	7/2(−)

149mDy	2661.1(4) keV	490(15) ms	IT (99.3%)	149Dy	(27/2−)

β+ (.7%)	149Tb

150Dy	66	84	149.925585(5)	7.17(5) min	β+ (64%)	150Tb	0+

α (36%)	146Gd

151Dy	66	85	150.926185(4)	17.9(3) min	β+ (94.4%)	151Tb	7/2(−)

α (5.6%)	147Gd

152Dy	66	86	151.924718(6)	2.38(2) h	EC (99.9%)	152Tb	0+

α (.1%)	148Gd

153Dy	66	87	152.925765(5)	6.4(1) h	β+ (99.99%)	153Tb	7/2(−)

α (.00939%)	149Gd

154Dy	66	88	153.924424(8)	3.0(15)×106 y	α	150Gd	0+

β+β+ (rare)	154Gd

155Dy	66	89	154.925754(13)	9.9(2) h	β+	155Tb	3/2−

155mDy	234.33(3) keV	6(1) µs	11/2−

156Dy	66	90	155.924283(7)	Observationally Stable	0+	5.6(3)×10−4

157Dy	66	91	156.925466(7)	8.14(4) h	β+	157Tb	3/2−

157m1Dy	161.99(3) keV	1.3(2) µs	9/2+

157m2Dy	199.38(7) keV	21.6(16) ms	IT	157Dy	11/2−

158Dy	66	92	157.924409(4)	Observationally Stable	0+	9.5(3)×10−4

159Dy	66	93	158.9257392(29)	144.4(2) d	EC	159Tb	3/2−

159mDy	352.77(14) keV	122(3) µs	11/2−

160Dy	66	94	159.9251975(27)	Observationally Stable	0+	0.02329(18)

161Dy	66	95	160.9269334(27)	Observationally Stable	5/2+	0.18889(42)

162Dy	66	96	161.9267984(27)	Observationally Stable	0+	0.25475(36)

163Dy	66	97	162.9287312(27)	Stable	5/2−	0.24896(42)

164Dy	66	98	163.9291748(27)	Stable	0+	0.28260(54)

165Dy	66	99	164.9317033(27)	2.334(1) h	β−	165Ho	7/2+

165mDy	108.160(3) keV	1.257(6) min	IT (97.76%)	165Dy	1/2−

β− (2.24%)	165Ho

166Dy	66	100	165.9328067(28)	81.6(1) h	β−	166Ho	0+

167Dy	66	101	166.93566(6)	6.20(8) min	β−	167Ho	(1/2−)

168Dy	66	102	167.93713(15)	8.7(3) min	β−	168Ho	0+

169Dy	66	103	168.94031(32)	39(8) s	β−	169Ho	(5/2−)

170Dy	66	104	169.94239(21)#	30# s	β−	170Ho	0+

171Dy	66	105	170.94620(32)#	6# s	β−	171Ho	7/2−#

172Dy	66	106	171.94876(43)#	3# s	β−	172Ho	0+

173Dy	66	107	172.95300(54)#	2# s	β−	173Ho	9/2+#

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