Isotopes of Gadolinium - Table

Table

nuclide
symbol		 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)
excitation energy
134Gd 64 70 133.95537(43)# 0.4# s 0+
135Gd 64 71 134.95257(54)# 1.1(2) s 3/2-
136Gd 64 72 135.94734(43)# 1# s β+ 136Eu
137Gd 64 73 136.94502(43)# 2.2(2) s β+ 137Eu 7/2+#
β+, p (rare) 136Sm
138Gd 64 74 137.94012(21)# 4.7(9) s β+ 138Eu 0+
138mGd 2232.7(11) keV 6(1) µs (8-)
139Gd 64 75 138.93824(21)# 5.7(3) s β+ 139Eu 9/2-#
β+, p (rare) 138Sm
139mGd 250(150)# keV 4.8(9) s 1/2+#
140Gd 64 76 139.93367(3) 15.8(4) s β+ 140Eu 0+
141Gd 64 77 140.932126(21) 14(4) s β+ (99.97%) 141Eu (1/2+)
β+, p (.03%) 140Sm
141mGd 377.8(2) keV 24.5(5) s β+ (89%) 141Eu (11/2-)
IT (11%) 141Gd
142Gd 64 78 141.92812(3) 70.2(6) s β+ 142Eu 0+
143Gd 64 79 142.92675(22) 39(2) s β+ 143Eu (1/2)+
β+, α (rare) 139Pm
β+, p (rare) 142Sm
143mGd 152.6(5) keV 110.0(14) s β+ 143Eu (11/2-)
β+, α (rare) 139Pm
β+, p (rare) 142Sm
144Gd 64 80 143.92296(3) 4.47(6) min β+ 144Eu 0+
145Gd 64 81 144.921709(20) 23.0(4) min β+ 145Eu 1/2+
145mGd 749.1(2) keV 85(3) s IT (94.3%) 145Gd 11/2-
β+ (5.7%) 145Eu
146Gd 64 82 145.918311(5) 48.27(10) d EC 146Eu 0+
147Gd 64 83 146.919094(3) 38.06(12) h β+ 147Eu 7/2-
147mGd 8587.8(4) keV 510(20) ns (49/2+)
148Gd 64 84 147.918115(3) 74.6(30) a α 144Sm 0+
β+β+ (rare) 148Sm
149Gd 64 85 148.919341(4) 9.28(10) d β+ 149Eu 7/2-
α (4.34×10−4%) 145Sm
150Gd 64 86 149.918659(7) 1.79(8)×106 a α 146Sm 0+
β+β+ (rare) 150Sm
151Gd 64 87 150.920348(4) 124(1) d EC 151Eu 7/2-
α (10−6%) 147Sm
152Gd 64 88 151.9197910(27) 1.08(8)×1014 a α 148Sm 0+ 0.0020(1)
153Gd 64 89 152.9217495(27) 240.4(10) d EC 153Eu 3/2-
153m1Gd 95.1737(12) keV 3.5(4) µs (9/2+)
153m2Gd 171.189(5) keV 76.0(14) µs (11/2-)
154Gd 64 90 153.9208656(27) Observationally Stable 0+ 0.0218(3)
155Gd 64 91 154.9226220(27) Observationally Stable 3/2- 0.1480(12)
155mGd 121.05(19) keV 31.97(27) ms IT 155Gd 11/2-
156Gd 64 92 155.9221227(27) Stable 0+ 0.2047(9)
156mGd 2137.60(5) keV 1.3(1) µs 7-
157Gd 64 93 156.9239601(27) Stable 3/2- 0.1565(2)
158Gd 64 94 157.9241039(27) Stable 0+ 0.2484(7)
159Gd 64 95 158.9263887(27) 18.479(4) h β- 159Tb 3/2-
160Gd 64 96 159.9270541(27) Observationally Stable 0+ 0.2186(19)
161Gd 64 97 160.9296692(29) 3.646(3) min β- 161Tb 5/2-
162Gd 64 98 161.930985(5) 8.4(2) min β- 162Tb 0+
163Gd 64 99 162.93399(32)# 68(3) s β- 163Tb 7/2+#
164Gd 64 100 163.93586(43)# 45(3) s β- 164Tb 0+
165Gd 64 101 164.93938(54)# 10.3(16) s β- 165Tb 1/2-#
166Gd 64 102 165.94160(64)# 4.8(10) s β- 166Tb 0+
167Gd 64 103 166.94557(64)# 3# s β- 167Tb 5/2-#
168Gd 64 104 167.94836(75)# 300# ms β- 168Tb 0+
169Gd 64 105 168.95287(86)# 1# s β- 169Tb 7/2-#

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