Isotopes of Uranium

Table

nuclide symbol	historic name	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	historic name	excitation energy			half-life	decay mode(s)	daughter isotope(s)	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
217U		92	125	217.02437(9)	26(14) ms			1/2-#
218U		92	126	218.02354(3)	6(5) ms	α	214Th	0+
219U		92	127	219.02492(6)	55(25) ms	α	215Th	9/2+#
220U		92	128	220.02472(22)#	60# ns	α	216Th	0+
220U		92	128	220.02472(22)#	60# ns	β+ (rare)	220Pa	0+
221U		92	129	221.02640(11)#	700# ns	α	217Th	9/2+#
221U		92	129	221.02640(11)#	700# ns	β+ (rare)	221Pa	9/2+#
222U		92	130	222.02609(11)#	1.4(7) us	α	218Th	0+
222U		92	130	222.02609(11)#	1.4(7) us	β+ (10−6%)	222Pa	0+
223U		92	131	223.02774(8)	21(8) us	α	219Th	7/2+#
224U		92	132	224.027605(27)	940(270) us	α	220Th	0+
225U		92	133	225.02939#	61(4) ms	α	221Th	(5/2+)#
226U		92	134	226.029339(14)	269(6) ms	α	222Th	0+
227U		92	135	227.031156(18)	1.1(1) min	α	223Th	(3/2+)
227U		92	135	227.031156(18)	1.1(1) min	β+ (.001%)	227Pa	(3/2+)
228U		92	136	228.031374(16)	9.1(2) min	α (95%)	224Th	0+
228U		92	136	228.031374(16)	9.1(2) min	EC (5%)	228Pa	0+
229U		92	137	229.033506(6)	58(3) min	β+ (80%)	229Pa	(3/2+)
229U		92	137	229.033506(6)	58(3) min	α (20%)	225Th	(3/2+)
230U		92	138	230.033940(5)	20.8 d	α	226Th	0+
						SF (1.4×10−10%)	(various)
						β+β+ (rare)	230Th
231U		92	139	231.036294(3)	4.2(1) d	EC	231Pa	(5/2)(+#)
231U		92	139	231.036294(3)	4.2(1) d	α (.004%)	227Th	(5/2)(+#)
232U		92	140	232.0371562(24)	68.9(4) y	α	228Th	0+
						CD (8.9×10−10%)	208Pb 24Ne
						CD (5×10−12%)	204Hg 28Mg
						SF (10−12%)	(various)
233U		92	141	233.0396352(29)	1.592(2)×105 y	α	229Th	5/2+
						SF (6×10−9%)	(various)
						CD (7.2×10−11%)	209Pb 24Ne
						CD (1.3×10−13%)	205Hg 28Mg
234U	Uranium II	92	142	234.0409521(20)	2.455(6)×105 y	α	230Th	0+		0.000050- 0.000059
						SF (1.73×10−9%)	(various)
						CD (1.4×10−11%)	206Hg 28Mg
						CD (9×10−12%)	184Hf 26Ne 24Ne
234mU		1421.32(10) keV			33.5(20) ms			6-
235U	Actin Uranium Actino-Uranium	92	143	235.0439299(20)	7.04(1)×108 y	α	231Th	7/2-		0.007198- 0.007207
						SF (7×10−9%)	(various)
						CD (8×10−10%)	186Hf 25Ne 24Ne
235mU		0.0765(4) keV			~26 min	IT	235U	1/2+
236U		92	144	236.045568(2)	2.342(3)×107 y	α	232Th	0+
236U		92	144	236.045568(2)	2.342(3)×107 y	SF (9.6×10−8%)	(various)	0+
236m1U		1052.89(19) keV			100(4) ns			(4)-
236m2U		2750(10) keV			120(2) ns			(0+)
237U		92	145	237.0487302(20)	6.75(1) d	β-	237Np	1/2+
238U	Uranium I	92	146	238.0507882(20)	4.468(3)×109 y	α	234Th	0+		0.992739- 0.992752
						SF (5.45×10−5%)	(various)
						β-β- (2.19×10−10%)	238Pu
238mU		2557.9(5) keV			280(6) ns			0+
239U		92	147	239.0542933(21)	23.45(2) min	β-	239Np	5/2+
239m1U		20(20)# keV			>250 ns			(5/2+)
239m2U		133.7990(10) keV			780(40) ns			1/2+
240U		92	148	240.056592(6)	14.1(1) h	β-	240Np	0+
240U		92	148	240.056592(6)	14.1(1) h	α (10−10%)	236Th	0+
241U		92	149	241.06033(32)#	5# min	β-	241Np	7/2+#
242U		92	150	242.06293(22)#	16.8(5) min	β-	242Np	0+

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Isotopes of Uranium - Table

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