List of isotopes / atomic number 61 to atomic number 70

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The list of isotopes is the overview page for easy access to all elements. The structure is also explained there and the legend for the table can also be found there. Decay energies were recalculated with the given masses and the mass-energy equivalent of . ${\displaystyle \textstyle \Delta m=931{,}4940954{\frac {\mathrm {MeV} }{\mathrm {u} }}}$

₆₁ promethium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	Mass (u)
128 pm	1.0 s
130 pm	2.2 s	10.9 (εβ + ), 7.2 (εp)		εβ + =?, εp =?
132 pm	6.3 s	9.9 (εβ + ), 5.5 (εp)	(3+)	εβ + ≈ 100, εp ≈ 5 · 10 −5
133 pm	15 s	7.0	3/2 +	εβ +
133m1 Pm	15 s		11 / 2−	εβ + ≈ 100, IT =?
134 pm	5 s	8.9	(2+)	εβ +
134m1 Pm	22 s	8.9	(5+)	εβ +
135 pm	45 s	5.94	(11 / 2−)	εβ +
135m1 Pm	49 s	5.94	(3/2 +, 5/2 +)	εβ +
136 pm	47 p	7.85	(2+)	εβ +
136m1 Pm	107 p	7.85	(5−)	εβ +
137 pm	2.4 min		11 / 2−	εβ +
138 pm	10 s	6.90	1+	εβ +
138m1 Pm	3.24 min	6.90	(5−)	εβ + =?, IT =?
139 pm	4.15 min	4.52	(5/2) +	εβ +
139m1 Pm	180 ms	0.189 (IT), 4.709 (εβ + )	(11/2) -	IT = 99.94 , εβ + = 0.06 ${\displaystyle \left.^{+5}_{-2}\right.}$ ${\displaystyle \left.^{+20}_{-5}\right.}$
140 pm	9.2 s	6.09	1+	εβ +
140m1 Pm	5.95 min	6.09	7−	εβ +
140m2 Pm	5.95 min		8−	εβ +
141 pm	20.90 min	3.715	5/2 +	εβ +
142 pm	40.5 s	4,870	1+	εβ +
142m1 Pm	2.0 ms		(8) -	IT
143 pm	265 d	1.041	5/2 +	εβ +
144 pm	363 d	2,332	5−	εβ +
144m1 Pm	780 ns
144m2 Pm	≈2.7 µs
145 pm	17.7 a	0.163 (ε), 2.332 (α)	5/2 +	ε = 100, α = 2.8 · 10 −7
146 pm	5.53 a	1.472 (ε), 1.542 (β - )	3−	ε = 66.0, β - = 34.0
147 pm	2.6234 a	0.224	7/2 +	β -
148 pm	5,370 d	2,468	1−	β -
148m1 Pm	41.29 d	2.606 (β - ), 0.138 (IT)	6−	β - = 95.0, IT = 5.0
149 pm	53.08 h	1.071	7/2 +	β -
150 pm	2.68 h	3.454	(1−)	β -
151 pm	28.40 h	1.187	5/2 +	β -
152 pm	4.12 min	3.50	1+	β -
152m1 Pm	7.52 min	3.56	4−	β -
152m2 Pm	13.8 min		(8th)	β - <100, IT> 0
153 pm	5.25 min	1.90	5 / 2−	β -
154 pm	1.73 min	4.05	(0.1)	β -
154m1 Pm	2.68 min	4.05	(3.4)	β -
155 pm	41.5 s	3.17	(5 / 2−)	β -
156 pm	26.70 s	5.16	4 (-)	β -
157 pm	10.56 s	4.5	(5 / 2−)	β -
158 pm	4.8 s		6.2	β -
159 pm	4.8 s		1.47

₆₂ samarium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
131 Sm	1.2 s			εβ + ≈ 100, εp =?
132 Sm	4.0 s		0+	εβ + ≈ 100, εp =?
133 Sm	3.7 s		(5/2 +)	εβ + ≈ 100, εp =?
134 Sm	10 s	5.4	0+	εβ +
135 Sm	10.3 s	7.2 (εβ + ), 5.5 (εp)	(7/2 +)	εβ + ≈ 100, εp = 0.02
136 Sm	47 p	4.5	0+	εβ +
137 Sm	45 s	6.1	(9 / 2−)	εβ +
138 Sm	3.1 min	3.9	0+	εβ +
139 Sm	2.57 min	5.46	(1/2) +	εβ +
139m1 Sm	10.7 s		(11/2) -	IT = 93.7, εβ + = 6.3
140 sm	14.82 min	3.02	0+	εβ +
141 Sm	10.2 min	4,543	1/2 +	εβ +
141m1 Sm	22.6 min	4.719 (εβ + ), 0.176 (IT)	11 / 2−	εβ + = 99.69, IT = 0.31
142 Sm	72.49 min	2.090	0+	εβ +
143 Sm	8.83 min	3.443	3/2 +	εβ +
143m1 Sm	66 s	0.754 (IT), 4.197 (εβ + )	11 / 2−	IT = 99.76, εβ + = 0.24
143m2 Sm	30 ms	2,795	23/2 (-)	IT
144 Sm	stable 2ε		0+		003.1
145 Sm	340 d	0617	7 / 2−	ε
146 Sm	1.03 x 10 8 a	2.529	0+	α
147 Sm	1.06 x 10 11 a	2,310	7 / 2−	α	015.0
148 Sm	7 · 10 15 a	1.986	0+	α	011.3
149 Sm	2 · 10 15 a		7 / 2−	α	013.8
150 sm	stable α		0+		007.04
151 Sm	90 a	0.077	5 / 2−	β -
152 Sm	stable α		0+		026.7
153 Sm	46.284 h	0.808	3/2 +	β -
153m1 Sm	10.6 ms		11 / 2−	IT
154 Sm	stable 2β		0+		022.7
155 Sm	22.3 min	1.627	3 / 2−	β -
156 Sm	9.4 h	0.722	0+	β -
157 Sm	482 s	2.730	(3 / 2−)	β -
158 Sm	5.30 min	1.999	0+	β -
159 Sm	11.37 s	3.8	(5 / 2−)	β -
160 sm	9.6 s	3.0	0+	β -

₆₃ europium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
134 Eu	0.5 s			εβ + ≈ 100, εp> 0
135 Eu	1.5 s	8.7 (εβ + ), 5.0 (εp)		εβ + ≈ 100, εp =?
136 Eu	3.3 s	10.4 (εβ + ), 6.5 (εp)	(7+)	εβ + ≈ 100, εp = 0.09
136m1 Eu	30.7 s	10.4 (εβ + ), 6.5 (εp)	(3+)	εβ + ≈ 100, εp = 0.09
137 Eu	11 s	7.5	(11 / 2−)	εβ +
138 Eu	12.1 s	9.2	(6−)	εβ +
139 Eu	17.9 s	6.7	(11/2) -	εβ +
140 Eu	1.51 s	8.4	1+	εβ +
140m1 Eu	125 ms	8.585 (εβ + ), 0.185 (IT)	(5−)	IT = 100, εβ + <1
141 Eu	40.7 s	5.550	5/2 +	εβ +
141m1 Eu	2.7 s	5.646 (εβ + ), 0.096 (IT)	11 / 2−	εβ + = 13 , IT = 87 ${\displaystyle \left.^{+4}_{-2}\right.}$ ${\displaystyle \left.^{+2}_{-4}\right.}$
142 Eu	2.34 s	7,640	1+	εβ +
142m1 Eu	1.22 min	7,640	8−	εβ +
143 Eu	2.63 min	5.275	5/2 +	εβ +
144 Eu	10.2 s	6.315	1+	εβ +
145 Eu	5.93 d	2,660	5/2 +	εβ +
146 Eu	4.61 d	3.878	4−	εβ +
147 Eu	24.1 d	1.722 (εβ + ), 2.990 (α)	5/2 +	εβ + ≈ 100, α = 0.0022
148 Eu	54.5 d	3.107 (εβ + ), 2.761 (α)	5−	εβ + ≈ 100, α = 9.4 · 10 −7
149 Eu	93.1 d	0.692	5/2 +	ε
150 eu	36.9 a	2.261	5 (-)	εβ +
150m1 Eu	12.8 h	2.303 (εβ + ), 1.013 (β - ), 0.042 (IT)	0−	εβ + = 11, β - = 89, IT <5 · 10 −8
151 Eu	> 1.7 · 10 18 a		5/2 +	α =?	047.8
152 Eu	13,537 a	1.874 (εβ + ), 1.819 (β - )	3−	ε = 72.1, β - = 27.9
152m1 Eu	9.3116 h	1.920 (εβ + ), 1.865 (β - )	0−	εβ + = 28, β - = 72
152m2 Eu	96 min	0.148	8−	IT
153 Eu	stable α		5/2 +		052.2
154 Eu	8,593 a	1.969 (β - ), 0.717 (εβ + )	3−	β - ≈ 100, εβ + = 0.02
154m1 Eu	46.3 min	0.145	(8−)	IT
155 Eu	4.7611 a	0.252	5/2 +	β -
156 Eu	15.19 d	2,451	0+	β -
157 Eu	15.18 h	1.363	5/2 +	β -
158 Eu	45.9 min	3,490	(1−)	β -
159 Eu	18.1 min	2.514	5/2 +	β -
160 eu	38 p	4.58	1 (-)	β -
161 Eu	26 p	3.7		β -
162 Eu	10.6 s	5.6		β -

₆₄ gadolinium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
137 Gd	7 s	8.8		εβ +
139 Gd	4.9 s	7.7 (εβ + ), 6.3 (β + p)	9 / 2−	εβ + =?, β + p =?
140 Gd	15.8 s	5.5	0+	εβ +
141 Gd	14 s	7.2 (εβ + ), 4.9 (εp)	(1/2 +)	εβ + ≈ 100, εp = 0.03
141m1 Gd	24.5 s	7.578 (εβ + ), 0.378 (IT)	(11 / 2−)	εβ + = 89, IT = 11
142 Gd	70.2 s	4.5	0+	εβ +
143 Gd	39 s	6.01	(1/2) +	εβ + ≈ 100, εp <0.001
143m1 Gd	112 p	6.163	(11 / 2−)	εβ +
144 Gd	4.5 min	3.74	0+	εβ +
145 Gd	23.0 min	5.05	1/2 +	εβ +
145m1 Gd	85 s	0.749 (IT), 5.799 (εβ + )	11 / 2−	IT = 94.3, εβ + = 5.7
146 Gd	48.27 d	1.030	0+	ε
147 Gd	38.06 h	2.187	7 / 2−	εβ +
148 Gd	74.6 a	3.271	0+	α
149 Gd	9.28 d	1.314 (εβ + ), 3.100 (α)	7 / 2−	εβ + ≈ 100, α = 4.3 · 10 −4
150 Gd	1.79 · 10 6 a	2.809	0+	α
151 Gd	124 d	0.464 (ε), 2.653 (α)	7 / 2−	ε ≈ 100, α ≈ 8 · 10 −7
152 Gd	1.08 x 10 14 a	2.205	0+	α	000.20
153 Gd	240.4 d	0.485	3 / 2−	ε
154 Gd	stable α		0+		002.18
155 Gd	stable α		3 / 2−		014.80
155m1 Gd	31.97 ms	0.121	11 / 2−	IT
156 Gd	stable SF		0+		020.47
157 Gd	stable SF		3 / 2−		015.65
158 Gd	stable SF		0+		024.84
159 Gd	18.479 h	0.971	3 / 2−	β -
160 Gd	stable 2β		0+	2β =?	021.86
161 Gd	3.66 min	1.956	5 / 2−	β -
162 Gd	8.4 min	1.39	0+	β -
163 Gd	68 p	3.1	(5 / 2−)	β -
164 Gd	45 s	2.3	0+	β -

₆₅ terbium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
140 p	2.4 s	10.8 (εβ + ), −0.3 (p), 7.3 (εp)	5	εβ + ≈ 100, p, εp = 0.26
141 p	3.5 s	8.3	(5 / 2−)	εβ +
141m1 Tb	7.9 s	8.3		εβ +
142 p	597 ms	10.1 (εβ + ), 6.0 (εp)	1+	εβ + ≈ 100, εp = 0.0022
142m1 Tb	303 ms	0.28 (IT), 10.38 (εβ + ), 6.28 (εp)	(5−)	IT = 100, εβ + <0.5
143 p	12 s	7.4	(11 / 2−)	εβ +
143m1 Tb	21 s	0.0	(5/2 +)
144 p	1 s	8.9	(1+)	εβ +
144m1 Tb	4.25 s	0.397 (IT), 9.297 (εβ + )	(6−)	IT = 66, εβ + = 34
145 p		6.51	(1/2 +)
145m1 Tb	29.5 s	6.70 (εβ + )	(11 / 2−)	εβ +
146 p	8 s	8.08	1+	εβ +
146m1 Tb	23 p	8.08	5−	εβ +
146m2 Tb	1.18 ms	0.78	(10+)	IT
147 p	1.7 h	4.609	(1/2 +)	εβ +
147m1 Tb	1.83 min	4,660	(11/2) -	εβ +
148 p	60 min	5.69	2−	εβ +
148m1 Tb	2.20 min	5.78	9+	εβ +
149 p	4.118 h	3.636 (εβ + ), 4.113 (α)	1/2 +	εβ + = 83.3, α = 16.7
149m1 Tb	4.16 min	3,672 (εβ + ), 4,077 (α)	11 / 2−	εβ + = 99.978, α = 0.022
150 p	3.48 h	4.656 (εβ + ), 3.587 (α)	(2−)	εβ + ≈ 100, α <0.05
150m1 Tb	5.8 min	5.130	9+	εβ +
151 p	17.609 h	2.565 (εβ + ), 3.497 (α)	1/2 (+)	εβ + ≈ 100, α = 9.5 · 10 −3
151m1 Tb	25 s	0.099 (IT), 2.664 (εβ + )	(11 / 2−)	IT = 93.8, εβ + = 6.2
152 p	17.5 h	3.990 (εβ + ), 3.090 (α)	2−	εβ + ≈ 100, α <7 · 10 −7
152m1 Tb	4.2 min	0.502 (IT), 4.492 (εβ + )	8+	IT = 78.8, εβ + = 21.2
153 p	2.34 d	1.57	5/2 +	εβ +
154 p	21.5 h	3.56 (εβ + ), 0.25 (β - )	0	εβ + ≈ 100, β - <0.1
154m1 Tb	9.4 h	3.56 (εβ + ), 0.0 (IT), 0.25 (β - )	3−	εβ + = 78.2, IT = 21.8, β - <0.1
154m2 Tb	22.7 h	3.56 (εβ + ), 0.0 (IT)	7−	εβ + = 98.2, IT = 1.8
154m3 Tb	513 ns
155 p	5.32 d	0.821	3/2 +	ε
156 p	5.35 d	2.444 (εβ + ), 0.434 (β - )	3−	εβ + ≈ 100, β - =?
156m1 Tb	24.4 h	0.05	(7−)	IT
156m2 Tb	5.3 h	0.088 (IT), 2.532 (εβ + )	(0+)	IT =?, Εβ + =?
157 p	71 a	0.060	3/2 +	ε
158 p	180 a	1.220 (εβ + ), 0.937 (β - )	3−	εβ + = 83.4, β - = 16.6
158m1 Tb	10.70 s	0.110 (IT), 1.047 (β - ), 1.330 (εβ + )	0−	IT = 100, β - <0.6, εβ + <0.01
158m2 Tb	0.4 ms	0.388 (IT)	7−	IT
159 p	stable SF		3/2 +		100
160 p	72.3 d	1,835	3−	β -
161 p	6.88 d	0.593	3/2 +	β -
162 p	7.60 min	2.510	1−	β -
163 p	19.5 min	1,785	3/2 +	β -
164 p	3.0 min	3.89	(5+)	β -
165 p	2.11 min	3.0	(3/2 +)	β -

₆₆ dysprosium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
141 Dy	0.9 s	9.3 (εβ + ), 8.8 (εp)	(9 / 2−)	εβ + ≈ 100, εp =?
142 Dy	2.3 s	6.9 (εβ + ), 5.7 (εp)	0+	εβ + ≈ 100, εp = 0.06
143 Dy	4.1 s	8.8 (εβ + ), 7.6 (εp)	(1/2 +)	εβ + ≈ 100, εp =?
144 Dy	9.1 s	6.2 (εβ + ), 4.1 (εp)	0+	εβ + ≈ 100, εp =?
145 Dy	10 s	7.72	(1/2 +)	εβ +
145m1 Dy	13.6 s	7.72	(11 / 2−)	εβ +
146 Dy	29 p	5.16	0+	εβ +
146m1 Dy	150 ms	2.936	(10+)	IT
147 Dy	40 s	6.37 (εβ + ), 4.43 (εp)	1/2 +	εβ + ≈ 100, εp =?
147m1 Dy	55 s	7.121 (εβ + ), 0.751 (IT)	11 / 2−	εβ + = 65, IT = 35
148 Dy	3.1 min	2.678	0+	εβ +
149 Dy	4.20 min	3.812	(7 / 2−)	εβ +
149m1 Dy	490 ms	2.661 (IT), 6.473 (εβ + )	(27 / 2−)	IT = 99.3, εβ + = 0.7
150 Dy	7.17 min	4.351 (α), 1.794 (εβ + )	0+	α = 36, εβ + = 64
151 Dy	17.9 min	2.87 (εβ + ), 4.180 (α)	7/2 (-)	εβ + = 94.4, α = 5.6
152 Dy	2.38 h	0.60 (εβ + ), 3.727 (α)	0+	ε (?) = 99.900, α = 0.100
153 Dy	6.4 h	2.17 (εβ + ), 3.559 (α)	7/2 (-)	εβ + ≈ 100, α = 0.0094
154 Dy	3.0 · 10 6 a	2.947	0+	α
155 Dy	9.9 h	2.095	3 / 2−	εβ +
155m1 Dy	6 µs	0.234	11 / 2−	IT
156 Dy	stable α, 2ε		0+		000.06
157 Dy	8.14 h	1.341	3 / 2−	εβ +
157m1 Dy	21.6 ms	0.199	11 / 2−	IT
158 Dy	stable α, 2ε		0+		000.10
159 Dy	144.4 d	0.366	3 / 2−	ε
160 Dy	stable α		0+		002.34
161 Dy	stable α		5/2 +		018.9
162 Dy	stable α		0+		025.5
163 Dy	stable SF		5 / 2−		024.9
164 Dy	stable SF		0+		028.2
165 Dy	2,334 h	1.286	7/2 +	β -
165m1 Dy	1.257 min	0.108 (IT), 1.394 (β - )	1 / 2−	IT = 97.76, β - = 2.24
166 Dy	81.6 h	0.486	0+	β -
167 Dy	6.20 min	2.35	(1 / 2−)	β -
168 Dy	8.7 min	1.6	0+	β -
169 Dy	39 s	3.2	(5 / 2−)	β -

₆₇ holmium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
144 Ho	0.7 s	11.8 (εβ + ), 8.7 (εp)		εβ + ≈ 100, εp =?
145 Ho	2.4 s		(11 / 2−)	εβ +
146 Ho	3.6 s	10.7 (εβ + ), 7.0 (εp)	(10+)	εβ + ≈ 100, εp =?
147 Ho	5.8 s	8.1 (εβ + ), 4.5 (εp)	(11 / 2−)	εβ + ≈ 100, εp =?
148 Ho	2.2 s	9.4	1+	εβ +
148m1 Ho	9.59 s	9.4 (εβ + ), 5.0 (εp)	6−	εβ + ≈ 100, εp = 0.08
148m2 Ho	2.35 ms		(10+)	IT
149 Ho	21.1 s	6.014	(11 / 2−)	εβ +
149m1 Ho	56 s	6,063	(1/2 +)	εβ +
150 Ho	72 s	7.240	2−	εβ +
150m1 Ho	23.3 s	8.040	(9) +	εβ +
151 Ho	35.2 s	5.142 (εβ + ), 4.695 (α)	(11 / 2−)	εβ + = 78, α = 22
151m1 Ho	47.2 s	4.736 (α), 5.165 (εβ + )	(1/2 +)	α = 80 , εβ + = 20 ${\displaystyle \left.^{+15}_{-20}\right.}$ ${\displaystyle \left.^{+20}_{-15}\right.}$
152 Ho	161.8 s	4.507 (α), 6.550 (εβ + )	2−	α = 12, εβ + = 88
152m1 Ho	50.0 s	4.667 (α), 6.710 (εβ + )	9+	α = 10.8, εβ + = 89.2
153 Ho	2.01 min	4.129 (εβ + ), 4.015 (α)	11 / 2−	εβ + = 99.949, α = 0.051
153m1 Ho	9.3 min	4.179 (εβ + ), 4.119 (α)	1/2 +	εβ + = 99.82, α = 0.18
154 Ho	11.76 min	5.751 (εβ + ), 4.042 (α)	(2) -	εβ + = 99.981, α = 0.019
154m1 Ho	3.10 min	6.071 (εβ + ), 4.362 (α), 0.320 (IT)	8+	εβ + ≈ 100, α <0.001, IT ≈ 0
155 Ho	48 min	3.102	5/2 +	εβ +
156 Ho	56 min	5.06	(4+)	εβ +
156m1 Ho	9.5 s	5.06	(1+)	IT =?, Εβ + =?
157 Ho	12.6 min	2.54	7 / 2−	εβ +
158 Ho	11.3 min	4.23	5+	εβ +
158m1 Ho	28 min	4.297 (εβ + ), 0.067 (IT)	2−	εβ + <19, IT> 81
158m2 Ho	21.3 min	4.41 (εβ + ), 0.18 (IT)	(9+)	εβ + > 93, IT <7
159 Ho	33.05 min	1,838	7 / 2−	εβ +
159m1 Ho	8.30 s	0.206	1/2 +	IT
160 Ho	25.6 min	3.29	5+	εβ +
160m1 Ho	5.02 h	0.06 (IT), 3.35 (εβ + )	2−	IT = 65, εβ + = 35
160m2 Ho	3 s	0.17	(9+)	IT
161 Ho	2.48 h	0.895	7 / 2−	ε
161m1 Ho	6.76 s	0.211	1/2 +	IT
162 Ho	15.0 min	2.14	1+	εβ +
162m1 Ho	67.0 min	0.106 (IT), 2.246 (εβ + )	6−	IT = 62, εβ + = 38
163 Ho	4570 a	0.003	7 / 2−	ε
163m1 Ho	1.09 s	0.298	1/2 +	IT
164 Ho	29 min	0.987 (ε), 0.962 (β - )	1+	ε = 60, β - = 40
164m1 Ho	37.5 min	0.140	6−	IT
165 Ho	stable α		7 / 2−		100
166 Ho	26.83 h	1,855	0−	β -
166m1 Ho	1200 a	1,861	(7) -	β -
167 Ho	3.1 h	1.007	7 / 2−	β -
168 Ho	2.99 min	2.910	3+	β -
168m1 Ho	132 s	0.059 (IT), 2.969 (β - )	(6+)	IT> 99.5, β - <0.5
169 Ho	4.7 min	2.124	7 / 2−	β -
170 Ho	2.76 min	3.87	(6+)	β -
170m1 Ho	43 p	3.99	(1+)	β -
171 Ho	53 p	3.2	(7 / 2−)	β -
172 Ho	25 s			β -

₆₈ erbium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
145 he	0.9 s		(11 / 2−)	εβ + ≈ 100, εp =?
146 he	1.7 s		0+	εβ + ≈ 100, εp =?
147 he	2.5 s	9.1 (εβ + ), 8.4 (εp)	(11 / 2−)	εβ + ≈ 100, εp =?
147m1 he	2.5 s	9.1 (εβ + ), 8.4 (εp)	(1/2 +)	εβ + ≈ 100, εp =?
148 he	4.6 s	6.8 (εβ + )	0+	εβ + ≈ 100, εp ≈ 0.15
149 he	4 s	7.7 (εβ + ), 6.7 (εp)	(1/2 +)	εβ + ≈ 100, εp = 7
149m1 he	8.9 s	8.882 (εβ + ), 0.742 (IT), 7.442 (εp)	(11 / 2−)	εβ + = 96.5, IT = 3.5, εp = 0.18
150 he	18.5 s	4.108	0+	εβ +
151 he	23.5 s	5.40	(7 / 2−)	εβ +
151m1 he	0.58 s	2.586 (IT), 7.986 (εβ + )	(27 / 2−)	IT = 95.3, εβ + = 4.7
152 he	10.3 s	3.109 (εβ + ), 4.934 (α)	0+	εβ + = 10, α = 90
153 he	37.1 s	4.803 (α), 4.564 (εβ + )	(7 / 2−)	α = 53, εβ + = 47
154 he	3.73 min	2.032 (εβ + ), 4.280 (α)	0+	εβ + = 99.53, α = 0.47
154m1 he	39 ns	3.025 (IT), 7.305 (α)	11−	IT ≈ 100, α ≈ 0
155 he	5.3 min	3.84 (εβ + ), 4.12 (α)	7 / 2−	εβ + = 99.978, α = 0.022
156 he	19.5 min	1.37	0+	εβ +
157 he	18.65 min	3.50 (εβ + ), 3.30 (α)	3 / 2−	εβ + ≈ 100, α <0.02
157m1 he	76 ms	0.155	(9/2 +)	IT
158 he	2.29 h	0.90	0+	ε
159 he	36 min	2.769	3 / 2−	εβ +
160 he	28.58 h	0.33	0+	ε
161 he	3.21 h		3 / 2−	εβ +
162 he	stable α, 2ε		0+		000.14
163 he	75.0 min	1,210	5 / 2−	εβ +
164 he	stable α, 2ε		0+		001.61
165 he	10.36 h	0.376	5 / 2−	ε
166 he	stable α		0+		033.6
167 he	stable α		7/2 +		022.95
167m1 he	2.269 s	0.208	1 / 2−	IT
168 he	stable α		0+		026.8
169 he	9.40 d	0.351	1 / 2−	β -
170 he	stable α, 2β		0+		014.9
171 he	7.516 h	1,490	5 / 2−	β -
172 he	49.3 h	0.891	0+	β -
173 he	1.4 min	2.6	(7 / 2−)	β -
174 he	3.3 min	1.8	0+	β -
175 he	1.2 min		(9/2 +)	β -

₆₉ thulium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
146 Tm	235 ms	1.128	(10+)	εβ + ≈ 55, p ≈ 45
146m1 Tm	72 ms	1.128	(5−, 6−)	p = 100, εβ + =?
147 Tm	0.56 s	10.7 (εβ + ), 1.061 (p)	(11 / 2−)	εβ + ≈ 90, p ≈ 10
147m1 Tm	360 µs	1.061	(1/2 +, 3/2 +)	p
148 Tm	0.7 s	12.0	(10+)	εβ +
149 Tm	0.9 s	9.6 (εβ + ), 6.9 (εp)	(11 / 2−)	εβ + ≈ 100, εp = 0.2 ${\displaystyle \left.^{+2}_{-1}\right.}$
150 Tm	2.2 s	11.1 (εβ + )	(6−)	εβ + ≈ 100, εp = 1.2
150m1 Tm	5.2 ms	0.672 (IT)	(10+)	IT
151 Tm	4.17 s	7.4	(11 / 2−)	εβ +
151m1 Tm	6.6 s	7.4	(1/2 +)	εβ +
152 Tm	8.0 s	8.6	(2) -	εβ +
152m1 Tm	5.2 s	8.6	(9) +	εβ +
152m2 Tm	249 ms	2.555	17+	IT
152m3 Tm	42 ns	6.3		IT
153 Tm	1.48 s	5.248 (α), 6.459 (εβ + )	(11 / 2−)	α = 91, εβ + = 9
153m1 Tm	2.5 s	5.291 (α), 6.502 (εβ + )	(1/2 +)	α = 92, εβ + = 8
154 Tm	8.1 s	8.05 (εβ + ), 5.09 (α)	(2−)	εβ + = 56, α = 44
154m1 Tm	3.30 s	5.09 (α), 8.05 (εβ + ), 0 (IT)	(9+)	α = 90, εβ + = 10, IT =?
155 Tm	21.6 s	5.580 (εβ + ), 4.571 (α)	(11 / 2−)	εβ + = 98.1, α = 1.9
155m1 Tm	45 s	5.621 (εβ + ), 4.612 (α)	(1/2 +)	εβ + > 92, α <8
156 Tm	83.8 s	7.44 (εβ + ), 4.34 (α)	2−	εβ + = 99.936, α = 0.064
156m1 Tm	19 s	4.34		α =?
157 Tm	3.63 min	4.48	1/2 +	εβ +
158 Tm	3.98 min	6.60	2−	εβ +
158m1 Tm	20 ns		(5+)
158m2 Tm	16 ns		(9−)
159 Tm	9.13 min	3.85	5/2 +	εβ +
160 Tm	9.4 min	5.60	1−	εβ +
160m1 Tm	74.5 s	5.67 (εβ + ), 0.07 (IT)	5	εβ + = 15, IT = 85
161 Tm	33 min	3.16	7/2 +	εβ +
162 Tm	21.70 min	4.81	1−	εβ +
162m1 Tm	24.3 s	0.067 (IT), 4.887 (εβ + )	5+	IT = 82, εβ + = 18
163 Tm	1.810 h	2,439	1/2 +	εβ +
164 Tm	2.0 min	3,962	1+	εβ +
164m1 Tm	5.1 min	0 (IT), 3.962 (εβ + )	6−	IT ≈ 80, εβ + ≈ 20
165 Tm	30.06 h	1,592	1/2 +	εβ +
166 Tm	7.70 h	3.040	2+	εβ +
166m1 Tm	350 ms		6−	IT
167 Tm	9.25 d	0.748	1/2 +	ε
168 Tm	93.1 d	1.679 (εβ + ), 0.257 (β - )	3 (+)	εβ + = 99.990, β - = 0.010
169 Tm	stable α		1/2 +		100
170 Tm	128.6 d	0.314 (εβ + ), 0.968 (β - )	1−	ε = 0.131, β - = 99.869
171 Tm	1.92 a	0.096	1/2 +	β -
172 Tm	63.6 h	1,880	2−	β -
173 Tm	8.24 h	1.298	(1/2 +)	β -
174 Tm	5.4 min	3.08	(4) -	β -
175 Tm	15.2 min	2.39	1/2 +	β -
176 Tm	1.9 min	3.88	(4+)	β -
177 Tm	85 s	3.2	(1/2 +)	β -

₇₀ ytterbium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
151 Yb	1.6 s	9.1 (εβ + ), 9.0 (εp)	(1/2 +)	εβ + ≈ 100, εp =?
151m1 Yb	1.6 s	9.1	(11 / 2−)	εβ + ≈ 100, εp =?
152 Yb	3.04 s	5.47 (εβ + ), 4.5 (εp)	0+	εβ + ≈ 100, εp =?
152m1 Yb	30 µs	2.744	10+	IT
153 Yb	4.2 s	4.2 (α), 6.7 (εβ + )	7 / 2−	α = 50, εβ + = 50
154 Yb	0.409 s	5.474 (α), 4.49 (εβ + )	0+	α = 92.6, εβ + = 7.4
155 Yb	1,800 s	5.337 (α), 6.00 (εβ + )	(7 / 2−)	α = 89, εβ + = 11
156 Yb	26.1 s	3.58 (εβ + ), 4.812 (α)	0+	εβ + = 90, α = 10
157 Yb	38.6 s	5.50 (εβ + ), 4.62 (α)	7 / 2−	εβ + = 99.5, α = 0.5
158 Yb	1.49 min	4.171 (α), 2.670 (εβ + )	0+	α ≈ 0.0021, εβ +
159 Yb	1.58 min	5.05	5/2 (-)	εβ +
160 yb	4.8 min	2.30	0+	εβ +
161 Yb	4.2 min	4.15	3 / 2−	εβ +
162 Yb	18.87 min	1.66	0+	εβ +
163 Yb	11.05 min	3.37	3 / 2−	εβ +
164 Yb	75.8 min	1.00	0+	ε
165 Yb	9.9 min	2.762	5 / 2−	εβ +
166 Yb	56.7 h	0.304	0+	ε
167 Yb	17.5 min	1.954	5 / 2−	εβ +
168 Yb	stable α, 2ε		0+		000.13
169 Yb	32,026 d	0.909	7/2 +	ε
169m1 Yb	46 s	0.024	1 / 2−	IT
170 yb	stable α		0+		003.05
171 Yb	stable α		1 / 2−		014.3
171m1 Yb	5.25 ms		7/2 +	IT
172 Yb	stable α		0+		021.9
173 Yb	stable α		5 / 2−		016.12
174 Yb	stable α		0+		031.8
174m1 Yb	830 µs	1.518	6+	IT
175 Yb	4.185 d	0.470	7 / 2−	β -
175m1 Yb	68.2 ms		1 / 2−	IT
176 Yb	stable α, 2β		0+		012.7
176m1 Yb	11.4 s	1.050	(8−)	IT> 90, β - <10
177 Yb	1.911 h	1,399	(9/2 +)	β -
177m1 Yb	6.41 s	0.331	(1 / 2−)	IT
178 Yb	74 min	0.645	0+	β -
179 Yb	8.0 min	2.4	(1 / 2−)	β -
180 yb	2.4 min		0+	β -

swell

See also list of isotopes # web links