{{위키데이터 속성 추적}}
자연계에 존재하는 [[세륨]]의 동위 원소는 4종이 존재한다.

이들 중 <sup>136</sup>Ce과 <sup>138</sup>Ce은 β<sup>+</sup>β<sup>+</sup> 붕괴를 통해 바륨의 안정 동위 원소로 <sup>142</sup>Ce은 β<sup>-</sup>β<sup>-</sup> 붕괴를 통해 <sup>142</sup>Nd으로 붕괴할 것으로 예상된다. 하지만 이들이 붕괴하는 모습은 아직 관측되지 않았다. 어쩌면 이들은 다른 안정 동위 원소들처럼 붕괴하지 않을 수도 있다.

인공적으로 합성된 세륨의 동위 원소는 <sup>119</sup>Ce부터 <sup>157</sup>Ce까지 있다. 이들 중 <sup>144</sup>Ce의 반감기가 284.91일로 세륨 방사성 동위 원소들 중 반감기가 가장 길다.

== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵자<br />수
! Z([[양성자|p]])
! N([[중성자|n]])
! &nbsp;<br />동위 원소 질량 (u)<br />&nbsp;
! rowspan="2" | 반감기
! rowspan="2" | 붕괴<br />방식<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">약어:<br />ε: [[전자 포획]]<br />IT: [[이성질핵 전이]]</ref>
! rowspan="2" | 붕괴 생성<br />동위 원소<ref group="n">안정 동위 원소는 굵은 글씨로 표기</ref>
! rowspan="2" | 핵자<br />스핀
! rowspan="2" | 자연계에 존재하는<br />동위 원소의<br />양<br />(몰 분율)
! rowspan="2" | 자연계에 존재하는<br />최대 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
| <sup>119</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 61
| 118.95276(64)#
| 200# ms
| [[베타 붕괴|β<sup>+</sup>]]
| <sup>119</sup>La
| 5/2+#
|
|
|-
| <sup>120</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 62
| 119.94664(75)#
| 250# ms
| β<sup>+</sup>
| <sup>120</sup>La
| 0+
|
|
|-
| <sup>121</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 63
| 120.94342(54)#
| 1.1(1) s
| β<sup>+</sup>
| <sup>121</sup>La
| (5/2)(+#)
|
|
|-
| rowspan=2|<sup>122</sup>Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 64
| rowspan=2|121.93791(43)#
| rowspan=2|2# s
| β<sup>+</sup>
| <sup>122</sup>La
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, [[양성자 방출|p]]
| <sup>121</sup>Ba
|-
| rowspan=2|<sup>123</sup>Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 65
| rowspan=2|122.93540(32)#
| rowspan=2|3.8(2) s
| β<sup>+</sup>
| <sup>123</sup>La
| rowspan=2|(5/2)(+#)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>122</sup>Ba
|-
| <sup>124</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 66
| 123.93041(32)#
| 9.1(12) s
| β<sup>+</sup>
| <sup>124</sup>La
| 0+
|
|
|-
| rowspan=2|<sup>125</sup>Ce
| rowspan=2 style="text-align:right" | 58
| rowspan=2 style="text-align:right" | 67
| rowspan=2|124.92844(21)#
| rowspan=2|9.3(3) s
| β<sup>+</sup>
| <sup>125</sup>La
| rowspan=2|(7/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>124</sup>Ba
|-
| <sup>126</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 68
| 125.92397(3)
| 51.0(3) s
| β<sup>+</sup>
| <sup>126</sup>La
| 0+
|
|
|-
| <sup>127</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 69
| 126.92273(6)
| 29(2) s
| β<sup>+</sup>
| <sup>127</sup>La
| 5/2+#
|
|
|-
| <sup>128</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 70
| 127.91891(3)
| 3.93(2) min
| β<sup>+</sup>
| <sup>128</sup>La
| 0+
|
|
|-
| <sup>129</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 71
| 128.91810(3)
| 3.5(3) min
| β<sup>+</sup>
| <sup>129</sup>La
| (5/2+)
|
|
|-
| <sup>130</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 72
| 129.91474(3)
| 22.9(5) min
| β<sup>+</sup>
| <sup>130</sup>La
| 0+
|
|
|-
| style="text-indent:1em" | <sup>130m</sup>Ce
| colspan="3" style="text-indent:2em" | 2453.6(3) keV
| 100(8) ns
|
|
| (7-)
|
|
|-
| <sup>131</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 73
| 130.91442(4)
| 10.2(3) min
| β<sup>+</sup>
| <sup>131</sup>La
| (7/2+)
|
|
|-
| style="text-indent:1em" | <sup>131m</sup>Ce
| colspan="3" style="text-indent:2em" | 61.8(1) keV
| 5.0(10) min
| β<sup>+</sup>
| <sup>131</sup>La
| (1/2+)
|
|
|-
| <sup>132</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 74
| 131.911460(22)
| 3.51(11) h
| β<sup>+</sup>
| <sup>132</sup>La
| 0+
|
|
|-
| style="text-indent:1em" | <sup>132m</sup>Ce
| colspan="3" style="text-indent:2em" | 2340.8(5) keV
| 9.4(3) ms
| [[이성질핵 전이|IT]]
| <sup>132</sup>Ce
| (8-)
|
|
|-
| <sup>133</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 75
| 132.911515(18)
| 97(4) min
| β<sup>+</sup>
| <sup>133</sup>La
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>133m</sup>Ce
| colspan="3" style="text-indent:2em" | 37.1(8) keV
| 4.9(4) h
| β<sup>+</sup>
| <sup>133</sup>La
| 9/2-
|
|
|-
| <sup>134</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 76
| 133.908925(22)
| 3.16(4) d
| [[전자 포획|ε]]
| <sup>134</sup>La
| 0+
|
|
|-
| <sup>135</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 77
| 134.909151(12)
| 17.7(3) h
| β<sup>+</sup>
| <sup>135</sup>La
| 1/2(+)
|
|
|-
| style="text-indent:1em" | <sup>135m</sup>Ce
| colspan="3" style="text-indent:2em" | 445.8(2) keV
| 20(1) s
| IT
| <sup>135</sup>Ce
| (11/2-)
|
|
|-
| <sup>136</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 78
| 135.907172(14)
| colspan=3 align=center|'''관찰 안정'''<ref group="n">이론상으로 β<sup>+</sup>β<sup>+</sup> 붕괴를 통해 '''<sup>136</sup>Ba'''으로 붕괴할 것이며 반감기는 8.6×10<sup>21</sup> 년을 초과할 것으로 예상된다.</ref>
| 0+
| 0.00185(2)
| 0.00185-0.00186
|-
| style="text-indent:1em" | <sup>136m</sup>Ce
| colspan="3" style="text-indent:2em" | 3095.5(4) keV
| 2.2(2) µs
|
|
| 10+
|
|
|-
| <sup>137</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 79
| 136.907806(14)
| 9.0(3) h
| β<sup>+</sup>
| <sup>137</sup>La
| 3/2+
| 
| 
|-
| rowspan=2 style="text-indent:1em" | <sup>137m</sup>Ce
| rowspan=2 colspan="3" style="text-indent:2em" | 254.29(5) keV
| rowspan=2|34.4(3) h
| IT (99.22%)
| <sup>137</sup>Ce
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.779%)
| <sup>137</sup>La
|-
| <sup>138</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 80
| 137.905991(11)
| colspan=3 align=center|'''관찰 안정'''<ref group="n">이론상으로 β<sup>+</sup>β<sup>+</sup> 붕괴를 통해 '''<sup>138</sup>Ba'''으로 붕괴할 것으로 예쌍되며 반감기는 1.5×10<sup>23</sup> 년을 초과할 것으로 예상된다.</ref>
| 0+
| 0.00251(2)
| 0.00251-0.00254
|-
| style="text-indent:1em" | <sup>138m</sup>Ce
| colspan="3" style="text-indent:2em" | 2129.17(12) keV
| 8.65(20) ms
| IT
| '''<sup>138</sup>Ce'''
| 7-
|
|
|-
| <sup>139</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 81
| 138.906653(8)
| 137.641(20) d
| ε
| '''<sup>139</sup>La'''
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>139m</sup>Ce
| colspan="3" style="text-indent:2em" | 754.24(8) keV
| 56.54(13) s
| IT
| <sup>139</sup>Ce
| 11/2-
|
|
|-
| <sup>140</sup>Ce<ref group="n" name="FP">[[핵분열 생성물]]</ref>
| style="text-align:right" | 58
| style="text-align:right" | 82
| 139.9054387(26)
| colspan=3 align=center|'''안정'''<ref group="n">이론상으로 [[자발 핵분열]]을 할 수 있다.</ref>
| 0+
| 0.88450(51)
| 0.88446-0.88449
|-
| style="text-indent:1em" | <sup>140m</sup>Ce
| colspan="3" style="text-indent:2em" | 2107.85(3) keV
| 7.3(15) µs
|
|
| 6+
|
|
|-
| <sup>141</sup>Ce<ref group="n" name="FP" />
| style="text-align:right" | 58
| style="text-align:right" | 83
| 140.9082763(26)
| 32.508(13) d
| β<sup>-</sup>
| '''<sup>141</sup>Pr'''
| 7/2-
|
|
|-
| <sup>142</sup>Ce<ref group="n" name="FP" />
| style="text-align:right" | 58
| style="text-align:right" | 84
| 141.909244(3)
| colspan=3 align=center|'''관찰 안정'''<ref group="n">이론상으로 β<sup>-</sup>β<sup>-</sup> 붕괴를 통해 '''<sup>142</sup>Nd'''으로 붕괴할 것이며 반감기는 10<sup>21</sup>년을 초과할 것으로 예상된다.</ref>
| 0+
| 0.11114(51)
| 0.11114-0.11114
|-
| <sup>143</sup>Ce<ref group="n" name="FP" />
| style="text-align:right" | 58
| style="text-align:right" | 85
| 142.912386(3)
| 33.039(6) h
| β<sup>-</sup>
| <sup>143</sup>Pr
| 3/2-
|
|
|-
| <sup>144</sup>Ce<ref group="n" name="FP" />
| style="text-align:right" | 58
| style="text-align:right" | 86
| 143.913647(4)
| 284.91(5) d
| β<sup>-</sup>
| <sup>144m</sup>Pr
| 0+
|
|
|-
| <sup>145</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 87
| 144.91723(4)
| 3.01(6) min
| β<sup>-</sup>
| <sup>145</sup>Pr
| (3/2-)
|
|
|-
| <sup>146</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 88
| 145.91876(7)
| 13.52(13) min
| β<sup>-</sup>
| <sup>146</sup>Pr
| 0+
|
|
|-
| <sup>147</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 89
| 146.92267(3)
| 56.4(10) s
| β<sup>-</sup>
| <sup>147</sup>Pr
| (5/2-)
|
|
|-
| <sup>148</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 90
| 147.92443(3)
| 56(1) s
| β<sup>-</sup>
| <sup>148</sup>Pr
| 0+
|
|
|-
| <sup>149</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 91
| 148.9284(1)
| 5.3(2) s
| β<sup>-</sup>
| <sup>149</sup>Pr
| (3/2-)#
|
|
|-
| <sup>150</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 92
| 149.93041(5)
| 4.0(6) s
| β<sup>-</sup>
| <sup>150</sup>Pr
| 0+
|
|
|-
| <sup>151</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 93
| 150.93398(11)
| 1.02(6) s
| β<sup>-</sup>
| <sup>151</sup>Pr
| 3/2-#
|
|
|-
| <sup>152</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 94
| 151.93654(21)#
| 1.4(2) s
| β<sup>-</sup>
| <sup>152</sup>Pr
| 0+
|
|
|-
| <sup>153</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 95
| 152.94058(43)#
| 500# ms [>300 ns]
| β<sup>-</sup>
| <sup>153</sup>Pr
| 3/2-#
|
|
|-
| <sup>154</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 96
| 153.94342(54)#
| 300# ms [>300 ns]
| β<sup>-</sup>
| <sup>154</sup>Pr
| 0+
|
|
|-
| <sup>155</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 97
| 154.94804(64)#
| 200# ms [>300 ns]
| β<sup>-</sup>
| <sup>155</sup>Pr
| 5/2-#
|
|
|-
| <sup>156</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 98
| 155.95126(64)#
| 150# ms
| β<sup>-</sup>
| <sup>156</sup>Pr
| 0+
|
|
|-
| <sup>157</sup>Ce
| style="text-align:right" | 58
| style="text-align:right" | 99
| 156.95634(75)#
| 50# ms
| β<sup>-</sup>
| <sup>157</sup>Pr
| 7/2+#
|
|
|}
<references group="n" />

== 각주 ==
<references />

{{동위 원소 색인}}

{{전거 통제}}

[[분류:세륨|동위 원소]]
[[분류:세륨 동위 원소| ]]
[[분류:원소별 동위 원소 목록]]