{{위키데이터 속성 추적}}
자연계에 존재하는 [[유로퓸]]의 동위 원소는 2종으로 <sup>151</sup>Eu, <sup>153</sup>Eu이 존재한다.

<sup>151</sup>Eu은 [[반감기]]가 5 x 10<sup>18</sup>년으로 매우 길기 때문에 사실상 안정으로 취급하고 있다.

존재비는 <sup>151</sup>Eu은 47.8%, <sup>153</sup>Eu은 52.2%로 거의 비슷하게 존재한다.

<sup>155</sup>Eu은 핵분열 생성물로써 중성자 흡수율이 매우 뛰어나 원자로의 핵분열의 효율을 떨어뜨린다.

== 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<ref group="n">안정 동위 원소는 굵은체로 표기, 우주의 나이보다 반감기가 긴 동위 원소의 반감기는 굵은 흘림체로 표기</ref>
! 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, 우주의 나이보다 반감기가 긴 동위 원소는 굵은 흘림체로 표기</ref>
! rowspan="2" | 핵<br />스핀
! rowspan="2" | 자연계에 존재하는<br />동위 원소<br />범위<br />(몰 분율)
! rowspan="2" | 자연계에 존재하는<br />최대 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
| <sup>130</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 67
| 129.96357(54)#
| 1.1(5) ms<br />[0.9(+5-3) ms]
|
|
| 2+#
|
|
|-
| <sup>131</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 68
| 130.95775(43)#
| 17.8(19) ms
|
|
| 3/2+
|
|
|-
| rowspan=2|<sup>132</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 69
| rowspan=2|131.95437(43)#
| rowspan=2|100# ms
| [[베타 붕괴|β<sup>+</sup>]]
| <sup>132</sup>Sm
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| [[양성자 방출|p]]
| <sup>131</sup>Sm
|-
| <sup>133</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 70
| 132.94924(32)#
| 200# ms
| β<sup>+</sup>
| <sup>133</sup>Sm
| 11/2-#
|
|
|-
| rowspan=2|<sup>134</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 71
| rowspan=2|133.94651(21)#
| rowspan=2|0.5(2) s
| β<sup>+</sup>
| <sup>134</sup>Sm
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p (드묾)
| <sup>133</sup>Pm
|-
| rowspan=2|<sup>135</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 72
| rowspan=2|134.94182(32)#
| rowspan=2|1.5(2) s
| β<sup>+</sup>
| <sup>135</sup>Sm
| rowspan=2|11/2-#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>134</sup>Pm
|-
| rowspan=2|<sup>136</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 73
| rowspan=2|135.93960(21)#
| rowspan=2|3.3(3) s
| β<sup>+</sup> (99.91%)
| <sup>136</sup>Sm
| rowspan=2|(7+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p (0.09%)
| <sup>135</sup>Pm
|-
| rowspan=2 style="text-indent:1em" | <sup>136m</sup>Eu
| rowspan=2 colspan="3" style="text-indent:2em" | 0(500)# keV
| rowspan=2|3.8(3) s
| β<sup>+</sup> (99.91%)
| <sup>136</sup>Sm
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p (0.09%)
| <sup>135</sup>Pm
|-
| <sup>137</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 74
| 136.93557(21)#
| 8.4(5) s
| β<sup>+</sup>
| <sup>137</sup>Sm
| 11/2-#
|
|
|-
| <sup>138</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 75
| 137.93371(3)
| 12.1(6) s
| β<sup>+</sup>
| <sup>138</sup>Sm
| (6-)
|
|
|-
| <sup>139</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 76
| 138.929792(14)
| 17.9(6) s
| β<sup>+</sup>
| <sup>139</sup>Sm
| (11/2)-
|
|
|-
| <sup>140</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 77
| 139.92809(6)
| 1.51(2) s
| β<sup>+</sup>
| <sup>140</sup>Sm
| 1+
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>140m</sup>Eu
| rowspan=2 colspan="3" style="text-indent:2em" | 210(15) keV
| rowspan=2|125(2) ms
| [[이성질핵 전이|IT]] (99%)
| <sup>140</sup>Eu
| rowspan=2|5-#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>(1%)
| <sup>140</sup>Sm
|-
| <sup>141</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 78
| 140.924931(14)
| 40.7(7) s
| β<sup>+</sup>
| <sup>141</sup>Sm
| 5/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>141m</sup>Eu
| rowspan=2 colspan="3" style="text-indent:2em" | 96.45(7) keV
| rowspan=2|2.7(3) s
| IT (86%)
| <sup>141</sup>Eu
| rowspan=2|11/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (14%)
| <sup>141</sup>Sm
|-
| <sup>142</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 79
| 141.92343(3)
| 2.36(10) s
| β<sup>+</sup>
| <sup>142</sup>Sm
| 1+
|
|
|-
| style="text-indent:1em" | <sup>142m</sup>Eu
| colspan="3" style="text-indent:2em" | 460(30) keV
| 1.223(8) min
| β<sup>+</sup>
| <sup>142</sup>Sm
| 8-
|
|
|-
| <sup>143</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 80
| 142.920298(12)
| 2.59(2) min
| β<sup>+</sup>
| <sup>143</sup>Sm
| 5/2+
|
|
|-
| style="text-indent:1em" | <sup>143m</sup>Eu
| colspan="3" style="text-indent:2em" | 389.51(4) keV
| 50.0(5) µs
|
|
| 11/2-
|
|
|-
| <sup>144</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 81
| 143.918817(12)
| 10.2(1) s
| β<sup>+</sup>
| '''<sup>144</sup>Sm'''
| 1+
|
|
|-
| style="text-indent:1em" | <sup>144m</sup>Eu
| colspan="3" style="text-indent:2em" | 1127.6(6) keV
| 1.0(1) µs
|
|
| (8-)
|
|
|-
| <sup>145</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 82
| 144.916265(4)
| 5.93(4) d
| β<sup>+</sup>
| <sup>145</sup>Sm
| 5/2+
|
|
|-
| style="text-indent:1em" | <sup>145m</sup>Eu
| colspan="3" style="text-indent:2em" | 716.0(3) keV
| 490 ns
|
|
| 11/2-
|
|
|-
| <sup>146</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 83
| 145.917206(7)
| 4.61(3) d
| β<sup>+</sup>
| <sup>146</sup>Sm
| 4-
|
|
|-
| style="text-indent:1em" | <sup>146m</sup>Eu
| colspan="3" style="text-indent:2em" | 666.37(16) keV
| 235(3) µs
|
|
| 9+
|
|
|-
| rowspan=2|<sup>147</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 84
| rowspan=2|146.916746(3)
| rowspan=2|24.1(6) d
| β<sup>+</sup> (99.99%)
| '''''<sup>147</sup>Sm'''''
| rowspan=2|5/2+
| rowspan=2|
| rowspan=2|
|-
| [[알파 붕괴|α]] (0.0022%)
| <sup>143</sup>Pm
|-
| rowspan=2|<sup>148</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 85
| rowspan=2|147.918086(11)
| rowspan=2|54.5(5) d
| β<sup>+</sup> (100%)
| '''''<sup>148</sup>Sm'''''
| rowspan=2|5-
| rowspan=2|
| rowspan=2|
|-
| α (9.39×10<sup>−7</sup>%)
| <sup>144</sup>Pm
|-
| <sup>149</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 86
| 148.917931(5)
| 93.1(4) d
| [[전자 포획|ε]]
| '''<sup>149</sup>Sm'''
| 5/2+
|
|
|-
| <sup>150</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 87
| 149.919702(7)
| 36.9(9) a
| β<sup>+</sup>
| '''<sup>150</sup>Sm'''
| 5(-)
|
|
|-
| rowspan=3 style="text-indent:1em" | <sup>150m</sup>Eu
| rowspan=3 colspan="3" style="text-indent:2em" | 42.1(5) keV
| rowspan=3|12.8(1) h
| β<sup>-</sup> (89%)
| <sup>150</sup>Gd
| rowspan=3|0-
| rowspan=3|
| rowspan=3|
|-
| β<sup>+</sup> (11%)
| '''<sup>150</sup>Sm'''
|-
| IT (5×10<sup>−8</sup>%)
| <sup>150</sup>Eu
|-
| <sup>151</sup>Eu<ref group="n">태양계 초창기부터 존재해 왔었던 방사성 핵자</ref>
| style="text-align:right" | 63
| style="text-align:right" | 88
| 150.9198502(26)
| '''5×10<sup>18</sup> a'''
| α
| <sup>147</sup>Pm
| 5/2+
| 0.4781(6)
|
|-
| style="text-indent:1em" | <sup>151m</sup>Eu
| colspan="3" style="text-indent:2em" | 196.245(10) keV
| 58.9(5) µs
|
|
| 11/2-
|
|
|-
| rowspan=2|<sup>152</sup>Eu
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 89
| rowspan=2|151.9217445(26)
| rowspan=2|13.537(6) a
| β<sup>+</sup> (72.09%)
| '''<sup>152</sup>Sm'''
| rowspan=2|3-
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup> (27.9%)
| '''''<sup>152</sup>Gd'''''
|-
| rowspan=2 style="text-indent:1em" | <sup>152m1</sup>Eu
| rowspan=2 colspan="3" style="text-indent:2em" | 45.5998(4) keV
| rowspan=2|9.3116(13) h
| β<sup>-</sup> (72%)
| '''''<sup>152</sup>Gd'''''
| rowspan=2|0-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (28%)
| '''<sup>152</sup>Sm'''
|-
| style="text-indent:1em" | <sup>152m2</sup>Eu
| colspan="3" style="text-indent:2em" | 65.2969(4) keV
| 0.94(8) µs
|
|
| 1-
|
|
|-
| style="text-indent:1em" | <sup>152m3</sup>Eu
| colspan="3" style="text-indent:2em" | 78.2331(4) keV
| 165(10) ns
|
|
| 1+
|
|
|-
| style="text-indent:1em" | <sup>152m4</sup>Eu
| colspan="3" style="text-indent:2em" | 89.8496(4) keV
| 384(10) ns
|
|
| 4+
|
|
|-
| style="text-indent:1em" | <sup>152m5</sup>Eu
| colspan="3" style="text-indent:2em" | 147.86(10) keV
| 96(1) min
|
|
| 8-
|
|
|-
| <sup>153</sup>Eu<ref group="n" name="FP">핵분열 생성물</ref>
| style="text-align:right" | 63
| style="text-align:right" | 90
| 152.9212303(26)
| colspan=3 align=center|'''안정'''<ref group="n">α 붕괴를 통해 <sup>149</sup>Pm으로 붕괴할 수 있다.</ref>
| 5/2+
| 0.5219(6)
|
|-
| rowspan=2|<sup>154</sup>Eu<ref group="n" name="FP" />
| rowspan=2 style="text-align:right" | 63
| rowspan=2 style="text-align:right" | 91
| rowspan=2|153.9229792(26)
| rowspan=2|8.593(4) a
| β<sup>-</sup> (99.98%)
| '''<sup>154</sup>Gd'''
| rowspan=2|3-
| rowspan=2|
| rowspan=2|
|-
| ε (0.02%)
| '''<sup>154</sup>Sm'''
|-
| style="text-indent:1em" | <sup>154m1</sup>Eu
| colspan="3" style="text-indent:2em" | 145.3(3) keV
| 46.3(4) min
| IT
| <sup>154</sup>Eu
| (8-)
|
|
|-
| style="text-indent:1em" | <sup>154m2</sup>Eu
| colspan="3" style="text-indent:2em" | 68.1702(4) keV
| 2.2(1) µs
|
|
| 2+
|
|
|-
| <sup>155</sup>Eu<ref group="n" name="FP" />
| style="text-align:right" | 63
| style="text-align:right" | 92
| 154.9228933(27)
| 4.7611(13) a
| β<sup>-</sup>
| '''<sup>155</sup>Gd'''
| 5/2+
|
|
|-
| <sup>156</sup>Eu<ref group="n" name="FP" />
| style="text-align:right" | 63
| style="text-align:right" | 93
| 155.924752(6)
| 15.19(8) d
| β<sup>-</sup>
| '''<sup>156</sup>Gd'''
| 0+
|
|
|-
| <sup>157</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 94
| 156.925424(6)
| 15.18(3) h
| β<sup>-</sup>
| '''<sup>157</sup>Gd'''
| 5/2+
|
|
|-
| <sup>158</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 95
| 157.92785(8)
| 45.9(2) min
| β<sup>-</sup>
| '''<sup>158</sup>Gd'''
| (1-)
|
|
|-
| <sup>159</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 96
| 158.929089(8)
| 18.1(1) min
| β<sup>-</sup>
| <sup>159</sup>Gd
| 5/2+
|
|
|-
| <sup>160</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 97
| 159.93197(22)#
| 38(4) s
| β<sup>-</sup>
| '''<sup>160</sup>Gd'''
| 1(-)
|
|
|-
| <sup>161</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 98
| 160.93368(32)#
| 26(3) s
| β<sup>-</sup>
| <sup>161</sup>Gd
| 5/2+#
|
|
|-
| <sup>162</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 99
| 161.93704(32)#
| 10.6(10) s
| β<sup>-</sup>
| <sup>162</sup>Gd
|
|
|
|-
| <sup>163</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 100
| 162.93921(54)#
| 6# s
| β<sup>-</sup>
| <sup>163</sup>Gd
| 5/2+#
|
|
|-
| <sup>164</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 101
| 163.94299(64)#
| 2# s
| β<sup>-</sup>
| <sup>164</sup>Gd
|
|
|
|-
| <sup>165</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 102
| 164.94572(75)#
| 1# s
| β<sup>-</sup>
| <sup>165</sup>Gd
| 5/2+#
|
|
|-
| <sup>166</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 103
| 165.94997(86)#
| 400# ms
| β<sup>-</sup>
| <sup>166</sup>Gd
|
|
|
|-
| <sup>167</sup>Eu
| style="text-align:right" | 63
| style="text-align:right" | 104
| 166.95321(86)#
| 200# ms
| β<sup>-</sup>
| <sup>167</sup>Gd
| 5/2+#
|
|
|}
{{각주|group="n"}}

== 각주 ==
{{각주}}

{{동위 원소 색인}}

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