{{위키데이터 속성 추적}}
천연적으로 산출되는 '''[[바륨]]'''(Ba)은 여섯 종류의 [[안정 동위 원소]]와 반감기가 아주 긴 한 종류의 [[방사성 동위 원소]](<sup>130</sup>Ba)로 이루어져 있다. <sup>130</sup>Ba은 암석 중의 붕괴 생성물 [[제논-130]]의 존재로 최근에야 불안정 동위 원소임이 확인되었다. 이중 [[전자 포획]]을 하며, 반감기는 (0.5-2.7)×10<sup>21</sup> 년(우주 나이의 약 10<sup>11</sup>배)이다.

<sup>130</sup>Ba 외에 33 종류의 [[방사성 동위 원소]]가 발견되었으며, 대부분은 반감기가 몇 밀리초에서 몇 분 정도로 아주 짧다. 예외는 반감기 10.51년의 <sup>133</sup>Ba과 반감기 11.5일의 <sup>131</sup>Ba, 반감기 2.55분의 <sup>137m</sup>Ba 정도이다.

바륨-114는 [[뭉치 붕괴]]를 통해 [[탄소-12|<sup>12</sup>C]]를 방출하고 <sup>102</sup>Sn이 될 것으로 예측되고 있으나, 관측은 되지 않았다. 붕괴 할 확률의 상한은 0.0034%이다.

표준 원자 질량은 137.327(7) [[원자 질량 단위|u]]이다.

== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵종<br />기호
! Z([[양성자|p]])
! N([[중성자|n]])
! &nbsp;<br />동위 원소 질량 (u)<br />&nbsp;
! rowspan="2" | 반감기<ref group="n">굵은 글꼴은 반감기가 우주의 나이보다 긴 동위 원소(거의 안정적)</ref>
! rowspan="2" | 붕괴<br />방식<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">약자:<br />CD: [[뭉치 붕괴]]<br />ε: [[전자 포획]]<br />IT: [[이성질핵 전이]]</ref>
! rowspan="2" | 붕괴<br />생성물<ref group="n">굵은 글꼴은 안정 동위 원소, 굵은 기울임꼴은 감기가 우주의 나이보다 긴 동위 원소(거의 안정적)</ref>
! rowspan="2" | 핵<br />스핀
! rowspan="2" | 전형적<br />동위 원소<br />구성비<br />(몰 분율)
! rowspan="2" | 자연적<br />구성비<br />변동 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
| rowspan=4|<sup>114</sup>Ba
| rowspan=4 style="text-align:right" | 56
| rowspan=4 style="text-align:right" | 58
| rowspan=4|113.95068(15)
| rowspan=4|530(230) ms<br />[0.43(+30−15) s]
| [[베타 붕괴|β<sup>+</sup>]], [[양성자 방출|p]] (99.59%)
| <sup>113</sup>Xe
| rowspan=4|0+
| rowspan=4|
| rowspan=4|
|-
| [[알파 붕괴|α]] (0.37%)
| <sup>110</sup>Xe
|-
| [[베타 붕괴|β<sup>+</sup>]] (0.04%)
| <sup>114</sup>Cs
|-
| [[뭉치 붕괴|CD]] (<0.0034%)<ref group="n">뭉치 붕괴할 것으로 예측되지만, 관찰된 적은 없다.</ref>
| <sup>102</sup>Sn, '''[[탄소-12|<sup>12</sup>C]]'''
|-
| rowspan=2|<sup>115</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 59
| rowspan=2|114.94737(64)#
| rowspan=2|0.45(5) s
| β<sup>+</sup>
| <sup>115</sup>Cs
| rowspan=2|(5/2+)#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>114</sup>Xe
|-
| rowspan=2|<sup>116</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 60
| rowspan=2|115.94138(43)#
| rowspan=2|1.3(2) s
| β<sup>+</sup>
| <sup>116</sup>Cs
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>115</sup>Xe
|-
| rowspan=3|<sup>117</sup>Ba
| rowspan=3 style="text-align:right" | 56
| rowspan=3 style="text-align:right" | 61
| rowspan=3|116.93850(32)#
| rowspan=3|1.75(7) s
| β<sup>+</sup>
| <sup>117</sup>Cs
| rowspan=3|(3/2)(+#)
| rowspan=3|
| rowspan=3|
|-
| β<sup>+</sup>, α
| <sup>113</sup>I
|-
| β<sup>+</sup>, p
| <sup>116</sup>Xe
|-
| rowspan=2|<sup>118</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 62
| rowspan=2|117.93304(21)#
| rowspan=2|5.2(2) s
| β<sup>+</sup>
| <sup>118</sup>Cs
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>117</sup>Xe
|-
| rowspan=2|<sup>119</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 63
| rowspan=2|118.93066(21)
| rowspan=2|5.4(3) s
| β<sup>+</sup>
| <sup>119</sup>Cs
| rowspan=2|(5/2+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>118</sup>Xe
|-
| <sup>120</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 64
| 119.92604(32)
| 24(2) s
| β<sup>+</sup>
| <sup>120</sup>Cs
| 0+
|
|
|-
| rowspan=2|<sup>121</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 65
| rowspan=2|120.92405(15)
| rowspan=2|29.7(15) s
| β<sup>+</sup> (99.98%)
| <sup>121</sup>Cs
| rowspan=2|5/2(+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p (0.02%)
| <sup>120</sup>Xe
|-
| <sup>122</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 66
| 121.91990(3)
| 1.95(15) min
| β<sup>+</sup>
| <sup>122</sup>Cs
| 0+
|
|
|-
| <sup>123</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 67
| 122.918781(13)
| 2.7(4) min
| β<sup>+</sup>
| <sup>123</sup>Cs
| 5/2(+)
|
|
|-
| <sup>124</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 68
| 123.915094(13)
| 11.0(5) min
| β<sup>+</sup>
| <sup>124</sup>Cs
| 0+
|
|
|-
| <sup>125</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 69
| 124.914473(12)
| 3.5(4) min
| β<sup>+</sup>
| <sup>125</sup>Cs
| 1/2(+#)
|
|
|-
| <sup>126</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 70
| 125.911250(13)
| 100(2) min
| β<sup>+</sup>
| <sup>126</sup>Cs
| 0+
|
|
|-
| <sup>127</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 71
| 126.911094(12)
| 12.7(4) min
| β<sup>+</sup>
| <sup>127</sup>Cs
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>127m</sup>Ba
| colspan="3" style="text-indent:2em" | 80.33(12) keV
| 1.9(2) s
| [[이성질핵 전이|IT]]
| <sup>127</sup>Ba
| 7/2−
|
|
|-
| <sup>128</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 72
| 127.908318(11)
| 2.43(5) d
| β<sup>+</sup>
| <sup>128</sup>Cs
| 0+
|
|
|-
| <sup>129</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 73
| 128.908679(12)
| 2.23(11) h
| β<sup>+</sup>
| <sup>129</sup>Cs
| 1/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>129m</sup>Ba
| rowspan=2 colspan="3" style="text-indent:2em" | 8.42(6) keV
| rowspan=2|2.16(2) h
| β<sup>+</sup>
| <sup>129</sup>Cs
| rowspan=2|7/2+#
| rowspan=2|
| rowspan=2|
|-
| IT
| <sup>129</sup>Ba
|-
| <sup>130</sup>Ba<ref group="n">원시 방사성 핵종</ref>
| style="text-align:right" | 56
| style="text-align:right" | 74
| 129.9063208(30)
| '''1.6(±1.1)×10<sup>21</sup> yrs'''
| [[이중 전자 포획|εε]]
| '''<sup>130</sup>Xe'''
| 0+
| 0.00106(1)
|
|-
| style="text-indent:1em" | <sup>130m</sup>Ba
| colspan="3" style="text-indent:2em" | 2475.12(18) keV
| 9.54(14) ms
| IT
| '''''<sup>130</sup>Ba'''''
| 8−
|
|
|-
| <sup>131</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 75
| 130.906941(3)
| 11.50(6) d
| β<sup>+</sup>
| <sup>131</sup>Cs
| 1/2+
|
|
|-
| style="text-indent:1em" | <sup>131m</sup>Ba
| colspan="3" style="text-indent:2em" | 187.14(12) keV
| 14.6(2) min
| IT
| <sup>131</sup>Ba
| 9/2−
|
|
|-
| <sup>132</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 76
| 131.9050613(11)
| colspan=3 align=center|'''[[관측상 안정]]'''<ref group="n">β<sup>+</sup>β<sup>+</sup> 붕괴를 통해 '''<sup>132</sup>Xe'''으로 붕괴할 것으로 추정되고 반감기는 3×10<sup>20</sup> 년이상일 것으로 추정된다</ref>
| 0+
| 0.00101(1)
|
|-
| <sup>133</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 77
| 132.9060075(11)
| 10.51(5) yrs
| [[전자 포획|ε]]
| '''<sup>133</sup>Cs'''
| 1/2+
| 
| 
|-
| rowspan=2 style="text-indent:1em" | <sup>133m</sup>Ba
| rowspan=2 colspan="3" style="text-indent:2em" | 288.247(9) keV
| rowspan=2|38.9(1) h
| IT (99.99%)
| <sup>133</sup>Ba
| rowspan=2|11/2−
| rowspan=2|
| rowspan=2|
|- 
| ε (0.0096%)
| '''<sup>133</sup>Cs'''
|-
| <sup>134</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 78
| 133.9045084(4)
| colspan=3 align=center|'''안정'''<ref group="n" name="SF">이론상으로 [[자발 핵분열]]을 할 수 있다.</ref>
| 0+
| 0.02417(18)
|
|-
| <sup>135</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 79
| 134.9056886(4)
| colspan=3 align=center|'''안정'''<ref group="n" name="SF" />
| 3/2+
| 0.06592(12)
|
|-
| style="text-indent:1em" | <sup>135m</sup>Ba
| colspan="3" style="text-indent:2em" | 268.22(2) keV
| 28.7(2) h
| IT
| '''<sup>135</sup>Ba'''
| 11/2−
|
|
|-
| <sup>136</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 80
| 135.9045759(4)
| colspan=3 align=center|'''안정'''<ref group="n" name="SF" />
| 0+
| 0.07854(24)
|
|-
| style="text-indent:1em" | <sup>136m</sup>Ba
| colspan="3" style="text-indent:2em" | 2030.466(18) keV
| 308.4(19) ms
| IT
| '''<sup>136</sup>Ba'''
| 7−
|
|
|-
| <sup>137</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 81
| 136.9058274(5)
| colspan=3 align=center|'''안정'''<ref group="n" name="SF" />
| 3/2+
| 0.11232(24)
|
|-
| style="text-indent:1em" | <sup>137m1</sup>Ba
| colspan="3" style="text-indent:2em" | 661.659(3) keV
| 2.552(1) min
| IT
| '''<sup>137</sup>Ba'''
| 11/2−
|
|
|-
| style="text-indent:1em" | <sup>137m2</sup>Ba
| colspan="3" style="text-indent:2em" | 2349.1(4) keV
| 0.59(10) µs
|
|
| (17/2−)
|
|
|-
| <sup>138</sup>Ba<ref group="n" name="FP">[[핵분열 생성물]]</ref>
| style="text-align:right" | 56
| style="text-align:right" | 82
| 137.9052472(5)
| colspan=3 align=center|'''안정'''<ref group="n" name="SF" />
| 0+
| 0.71698(42)
|
|-
| style="text-indent:1em" | <sup>138m</sup>Ba
| colspan="3" style="text-indent:2em" | 2090.54(6) keV
| 800(100) ns
|
|
| 6+
|
|
|-
| <sup>139</sup>Ba<ref group="n" name="FP" />
| style="text-align:right" | 56
| style="text-align:right" | 83
| 138.9088413(5)
| 83.06(28) min
| β<sup>-</sup>
| '''<sup>139</sup>La'''
| 7/2−
|
|
|-
| <sup>140</sup>Ba<ref group="n" name="FP" />
| style="text-align:right" | 56
| style="text-align:right" | 84
| 139.910605(9)
| 12.752(3) d
| β<sup>-</sup>
| <sup>140</sup>La
| 0+
|
|
|-
| <sup>141</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 85
| 140.914411(9)
| 18.27(7) min
| β<sup>-</sup>
| <sup>141</sup>La
| 3/2−
|
|
|-
| <sup>142</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 86
| 141.916453(7)
| 10.6(2) min
| β<sup>-</sup>
| <sup>142</sup>La
| 0+
|
|
|-
| <sup>143</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 87
| 142.920627(14)
| 14.5(3) s
| β<sup>-</sup>
| <sup>143</sup>La
| 5/2−
|
|
|-
| <sup>144</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 88
| 143.922953(14)
| 11.5(2) s
| β<sup>-</sup>
| <sup>144</sup>La
| 0+
|
|
|-
| <sup>145</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 89
| 144.92763(8)
| 4.31(16) s
| β<sup>-</sup>
| <sup>145</sup>La
| 5/2−
|
|
|-
| rowspan=2|<sup>146</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 90
| rowspan=2|145.93022(8)
| rowspan=2|2.22(7) s
| β<sup>-</sup> (99.98%)
| <sup>146</sup>La
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, [[중성자 방출|n]] (0.02%)
| <sup>145</sup>La
|-
| rowspan=2|<sup>147</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 91
| rowspan=2|146.93495(22)#
| rowspan=2|0.893(1) s
| β<sup>-</sup> (99.94%)
| <sup>147</sup>La
| rowspan=2|(3/2+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (0.06%)
| <sup>146</sup>La
|-
| rowspan=2|<sup>148</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 92
| rowspan=2|147.93772(9)
| rowspan=2|0.612(17) s
| β<sup>-</sup> (99.6%)
| <sup>148</sup>La
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (0.4%)
| <sup>147</sup>La
|-
| rowspan=2|<sup>149</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 93
| rowspan=2|148.94258(21)#
| rowspan=2|344(7) ms
| β<sup>-</sup> (99.57%)
| <sup>149</sup>La
| rowspan=2|3/2−#
| rowspan=2| 
| rowspan=2|
|-
| β<sup>-</sup>, n (0.43%)
| <sup>148</sup>La
|-
| rowspan=2|<sup>150</sup>Ba
| rowspan=2 style="text-align:right" | 56
| rowspan=2 style="text-align:right" | 94
| rowspan=2|149.94568(43)#
| rowspan=2|300 ms
| β<sup>-</sup>
| <sup>150</sup>La
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (드묾)
| <sup>149</sup>La
|-
| <sup>151</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 95
| 150.95081(43)#
| 200# ms [>300 ns]
| β<sup>-</sup>
| <sup>151</sup>La
| 3/2−#
|
|
|-
| <sup>152</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 96
| 151.95427(54)#
| 100# ms
| β<sup>-</sup>
| <sup>152</sup>La
| 0+
|
|
|-
| <sup>153</sup>Ba
| style="text-align:right" | 56
| style="text-align:right" | 97
| 152.95961(86)#
| 80# ms
| β<sup>-</sup>
| <sup>153</sup>La
| 5/2−#
|
|
|}
<references group="n" />

{{동위 원소 색인}}

{{전거 통제}}

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