Isotopes of dysprosium

Naturally occurring dysprosium (₆₆Dy) is composed of 7 stable isotopes, ¹⁵⁶Dy, ¹⁵⁸Dy, ¹⁶⁰Dy, ¹⁶¹Dy, ¹⁶²Dy, ¹⁶³Dy and ¹⁶⁴Dy, with ¹⁶⁴Dy being the most abundant (28.26% natural abundance). Twenty-nine radioisotopes have been characterized, with the most stable being ¹⁵⁴Dy with a half-life of 1.4 million years, ¹⁵⁹Dy with a half-life of 144.4 days, and ¹⁶⁶Dy with a half-life of 81.6 hours. All of the remaining radioactive isotopes have half-lives that are less than 10 hours, and the majority of these have half-lives that are less than 30 seconds. This element also has 12 meta states, with the most stable being ^165mDy (half-life 1.257 minutes), ^147mDy (half-life 55.7 seconds) and ^145mDy (half-life 13.6 seconds).

Quick facts Main isotopes, Decay ...

The primary decay mode before the most abundant stable isotope, ¹⁶⁴Dy, is electron capture to isotopes of terbium, and after beta decay to those of holmium.Dysprosium is the heaviest element to have isotopes that are theoretically stable (163, 164, rather than only ones that are observationally stable and predicted to be radioactive. ¹⁶⁴Dy has a surprisingly large thermal neutron absorption and the product isotope ¹⁶⁵Dy has found medical use (see below).

More information Nuclide, Z ...

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da)^[5] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Normal proportion^[1]	Range of variation
¹³⁹Dy	66	73	138.95953(54)#	600(200) ms	β⁺ (~89%)	¹³⁹Tb	(7/2+)
¹³⁹Dy	66	73	138.95953(54)#	600(200) ms	β⁺, p (~11%)	¹³⁸Gd	(7/2+)
¹⁴⁰Dy	66	74	139.95402(43)#	700# ms	β⁺?	¹⁴⁰Tb	0+
¹⁴⁰Dy	66	74	139.95402(43)#	700# ms	β⁺, p?	¹³⁹Gd	0+
^140mDy	2166.1(5) keV			7.0(5) μs	IT	¹⁴⁰Dy	8−
¹⁴¹Dy	66	75	140.95128(32)#	0.90(14) s	β⁺	¹⁴¹Tb	(9/2−)
¹⁴¹Dy	66	75	140.95128(32)#	0.90(14) s	β⁺, p?	¹⁴⁰Gd	(9/2−)
¹⁴²Dy	66	76	141.94619(78)#	2.3(3) s	β⁺ (90%)	¹⁴²Tb	0+
					EC (10%)	¹⁴²Tb
					β⁺, p (0.06%)	¹⁴¹Gd
¹⁴³Dy	66	77	142.943994(14)	5.6(10) s	β⁺	¹⁴³Tb	(1/2+)
¹⁴³Dy	66	77	142.943994(14)	5.6(10) s	β⁺, p?	¹⁴²Gd	(1/2+)
^143m1Dy	310.7(6) keV			3.0(3) s	β⁺	¹⁴³Tb	(11/2−)
^143m1Dy	310.7(6) keV			3.0(3) s	β⁺, p?	¹⁴²Gd	(11/2−)
^143m2Dy	406.3(8) keV			1.2(3) μs	IT	¹⁴³Dy	(7/2−)
¹⁴⁴Dy	66	78	143.9392695(77)	9.1(4) s	β⁺	¹⁴⁴Tb	0+
¹⁴⁴Dy	66	78	143.9392695(77)	9.1(4) s	β⁺, p?	¹⁴³Gd	0+
¹⁴⁵Dy	66	79	144.9374740(70)	9.5(10) s	β⁺	¹⁴⁵Tb	(1/2+)
¹⁴⁵Dy	66	79	144.9374740(70)	9.5(10) s	β⁺, p?	¹⁴⁴Gd	(1/2+)
^145mDy	118.2(2) keV			14.1(7) s	β⁺	¹⁴⁵Tb	(11/2−)
^145mDy	118.2(2) keV			14.1(7) s	β⁺, p (~50%)	¹⁴⁴Gd	(11/2−)
¹⁴⁶Dy	66	80	145.9328445(72)	33.2(7) s	β⁺	¹⁴⁶Tb	0+
^146mDy	2934.5(4) keV			150(20) ms	IT	¹⁴⁶Dy	10+
¹⁴⁷Dy	66	81	146.9310827(95)	67(7) s	β⁺ (99.95%)	¹⁴⁷Tb	(1/2+)
¹⁴⁷Dy	66	81	146.9310827(95)	67(7) s	β⁺, p (0.05%)	¹⁴⁶Gd	(1/2+)
^147m1Dy	750.5(4) keV			55.2(5) s	β⁺ (68.9%)	¹⁴⁷Tb	(11/2−)
^147m1Dy	750.5(4) keV			55.2(5) s	IT (31.1%)	¹⁴⁷Dy	(11/2−)
^147m2Dy	3407.2(8) keV			0.40(1) μs	IT	¹⁴⁷Dy	(27/2−)
¹⁴⁸Dy	66	82	147.9271499(94)	3.3(2) min	β⁺	¹⁴⁸Tb	0+
^148mDy	2919.1(10) keV			471(20) ns	IT	¹⁴⁸Dy	10+
¹⁴⁹Dy	66	83	148.9273275(99)	4.20(14) min	β⁺	¹⁴⁹Tb	7/2−
^149mDy	2661.1(4) keV			490(15) ms	IT (99.3%)	¹⁴⁹Dy	27/2−
^149mDy	2661.1(4) keV			490(15) ms	β⁺ (0.7%)	¹⁴⁹Tb	27/2−
¹⁵⁰Dy	66	84	149.9255931(46)	7.17(5) min	β⁺ (66.4%)	¹⁵⁰Tb	0+
¹⁵⁰Dy	66	84	149.9255931(46)	7.17(5) min	α (33.6%)	¹⁴⁶Gd	0+
¹⁵¹Dy	66	85	150.9261913(35)	17.9(3) min	β⁺ (94.4%)	¹⁵¹Tb	7/2−
¹⁵¹Dy	66	85	150.9261913(35)	17.9(3) min	α (5.6%)	¹⁴⁷Gd	7/2−
¹⁵²Dy	66	86	151.9247253(49)	2.38(2) h	EC (99.90%)	¹⁵²Tb	0+
¹⁵²Dy	66	86	151.9247253(49)	2.38(2) h	α (0.100%)	¹⁴⁸Gd	0+
¹⁵³Dy	66	87	152.9257717(43)	6.4(1) h	β⁺ (99.99%)	¹⁵³Tb	7/2−
¹⁵³Dy	66	87	152.9257717(43)	6.4(1) h	α (0.0094%)	¹⁴⁹Gd	7/2−
¹⁵⁴Dy	66	88	153.9244289(80)	1.40(8)×10⁶ y^[6]	α^{[n 8]}	¹⁵⁰Gd	0+
¹⁵⁵Dy	66	89	154.925758(10)	9.9(2) h	β⁺	¹⁵⁵Tb	3/2−
^155mDy	234.33(3) keV			6(1) μs	IT	¹⁵⁵Dy	11/2−
¹⁵⁶Dy	66	90	155.9242836(11)	Observationally Stable^{[n 9]}			0+	5.6(3)×10⁻⁴
¹⁵⁷Dy	66	91	156.9254696(55)	8.14(4) h	β⁺	¹⁵⁷Tb	3/2−
^157m1Dy	161.99(3) keV			1.3(2) μs	IT	¹⁵⁷Dy	9/2+
^157m2Dy	199.38(7) keV			21.6(16) ms	IT	¹⁵⁷Dy	11/2−
¹⁵⁸Dy	66	92	157.9244148(25)	Observationally Stable^{[n 10]}			0+	9.5(3)×10⁻⁴
¹⁵⁹Dy	66	93	158.9257459(15)	144.4(2) d	EC	¹⁵⁹Tb	3/2−
^159mDy	352.77(14) keV			122(3) μs	IT	¹⁵⁹Dy	11/2−
¹⁶⁰Dy	66	94	159.92520358(75)	Observationally Stable^{[n 11]}			0+	0.02329(18)
¹⁶¹Dy^{[n 12]}	66	95	160.92693943(75)	Observationally Stable^{[n 13]}			5/2+	0.18889(42)
^161mDy	485.56(16) keV			0.76(17) μs	IT	¹⁶¹Dy	11/2−
¹⁶²Dy	66	96	161.92680451(75)	Observationally Stable^{[n 14]}			0+	0.25475(36)
^162mDy	2188.1(3) keV			8.3(3) μs	IT	¹⁶²Dy	8+
¹⁶³Dy	66	97	162.92873722(74)	Stable^{[n 15]}			5/2−	0.24896(42)
¹⁶⁴Dy^{[n 16]}	66	98	163.92918082(75)	Stable			0+	0.28260(54)
¹⁶⁵Dy	66	99	164.93170940(75)	2.332(4) h	β⁻	¹⁶⁵Ho	7/2+
^165mDy	108.1552(13) keV			1.257(6) min	IT (97.76%)	¹⁶⁵Dy	1/2−
^165mDy	108.1552(13) keV			1.257(6) min	β⁻ (2.24%)	¹⁶⁵Ho	1/2−
¹⁶⁶Dy	66	100	165.93281281(86)	81.6(1) h	β⁻	¹⁶⁶Ho	0+
¹⁶⁷Dy	66	101	166.9356824(43)	6.20(8) min	β⁻	¹⁶⁷Ho	(1/2−)
¹⁶⁸Dy	66	102	167.93713(15)	8.7(3) min	β⁻	¹⁶⁸Ho	0+
^168mDy	1378.2(6) keV			0.57(7) μs	IT	¹⁶⁸Dy	(4−)
¹⁶⁹Dy	66	103	168.94032(32)	39(8) s	β⁻	¹⁶⁹Ho	(5/2)−
^169mDy	166.1(5) keV			1.26(17) μs	IT	¹⁶⁹Dy	(1/2−)
¹⁷⁰Dy	66	104	169.94234(22)#	54.9(80) s	β⁻	¹⁷⁰Ho	0+
^170mDy	1643.8(3) keV			0.99(4) μs	IT	¹⁷⁰Dy	(6+)
¹⁷¹Dy	66	105	170.94631(22)#	4.07(40) s	β⁻	¹⁷¹Ho	7/2−#
¹⁷²Dy	66	106	171.94873(32)#	3.4(2) s	β⁻	¹⁷²Ho	0+
^172mDy	1278(1) keV			710(50) ms	IT (81%)	¹⁷²Dy	(8−)
^172mDy	1278(1) keV			710(50) ms	β⁻ (19%)	¹⁷²Ho	(8−)
¹⁷³Dy	66	107	172.95304(43)#	1.43(20) s	β⁻	¹⁷³Ho	9/2+#
¹⁷³Dy	66	107	172.95304(43)#	1.43(20) s	β⁻, n?	¹⁷²Ho	9/2+#
¹⁷⁴Dy	66	108	173.95585(54)#	1# s [>300 ns]	β⁻?	¹⁷⁴Ho	0+
¹⁷⁴Dy	66	108	173.95585(54)#	1# s [>300 ns]	β⁻, n?	¹⁷³Ho	0+
¹⁷⁵Dy	66	109	174.96057(54)#	390# ms [>550 ns]	β⁻?	¹⁷⁵Ho	1/2-#
¹⁷⁵Dy	66	109	174.96057(54)#	390# ms [>550 ns]	β⁻, n?	¹⁷⁴Ho	1/2-#
¹⁷⁶Dy	66	110	175.96392(54)#	440# ms [>550 ns]	β⁻?	¹⁷⁶Ho	0+
¹⁷⁶Dy	66	110	175.96392(54)#	440# ms [>550 ns]	β⁻, n?	¹⁷⁵Ho	0+
This table header & footer: view

[n 1]
^mDy – Excited nuclear isomer.
[n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
[n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
[n 4]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
[n 5]
Modes of decay:

EC: Electron capture

IT: Isomeric transition

p: Proton emission
[n 6]
Bold symbol as daughter – Daughter product is stable.
[n 7]
( ) spin value – Indicates spin with weak assignment arguments.
[n 8]
Theorized to also undergo β⁺β⁺ decay to ¹⁵⁴Gd
[n 9]
Believed to undergo α decay to ¹⁵²Gd or β⁺β⁺ decay to ¹⁵⁶Gd with a half-life over 10¹⁸ years
[N 10]
Believed to undergo α decay to ¹⁵⁴Gd or β⁺β⁺ decay to ¹⁵⁸Gd
[N 11]
Believed to undergo α decay to ¹⁵⁶Gd
[N 12]
Fission product
[N 13]
Believed to undergo α decay to ¹⁵⁷Gd
[N 14]
Believed to undergo α decay to ¹⁵⁸Gd
[N 15]
Can undergo bound-state β⁻ decay to ¹⁶³Ho⁶⁶⁺ with a half-life of 47 days when fully ionized^[7]
[N 16]
Heaviest theoretically stable nuclide

Isotopes of dysprosium

List of isotopes

Dysprosium-165

See also

References

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