{{위키데이터 속성 추적}}
자연계에 존재하는 [[란타넘]]의 [[동위 원소]]는 2종으로 <sup>138</sup>La, <sup>139</sup>La이 존재한다. 이들 중 <sup>138</sup>La은 방사성 동위 원소로 반감기는 1020억년이나 되며 자연계에 0.09%의 소량이 존재한다.
나머지는 [[안정 동위 원소]]인 <sup>139</sup>La이 차지한다.

인공적으로 합성된 란타넘의 동위 원소들 중 <sup>137</sup>La은 [[반감기]]가 6만년으로 란타넘의 인공 동위 원소들 중 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<ref group="n">안정 동위 원소는 굵은 글씨로 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
|-
| rowspan=2|<sup>117</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 60
| rowspan=2|116.95007(43)#
| rowspan=2|23.5(26) ms
| [[베타 붕괴|β<sup>+</sup>]]
| <sup>117</sup>Ba
| rowspan=2|(3/2+,3/2−)
| rowspan=2|
| rowspan=2|
|-
| [[양성자 방출|p]]
| <sup>116</sup>Ba
|-
| style="text-indent:1em" | <sup>117m</sup>La
| colspan="3" style="text-indent:2em" | 151(12) keV
| 10(5) ms
|
|
| (9/2+)
|
|
|-
| <sup>118</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 61
| 117.94673(32)#
| 200# ms
| β<sup>+</sup>
| <sup>118</sup>Ba
|
|
|
|-
| <sup>119</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 62
| 118.94099(43)#
| 1# s
| β<sup>+</sup>
| <sup>119</sup>Ba
| 11/2−#
|
|
|-
| rowspan=2|<sup>120</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 63
| rowspan=2|119.93807(54)#
| rowspan=2|2.8(2) s
| β<sup>+</sup>
| <sup>120</sup>Ba
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>119</sup>Cs
|-
| rowspan=2|<sup>121</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 64
| rowspan=2|120.93301(54)#
| rowspan=2|5.3(2) s
| β<sup>+</sup>
| <sup>121</sup>Ba
| rowspan=2|11/2−#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>120</sup>Cs
|-
| rowspan=2|<sup>122</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 65
| rowspan=2|121.93071(32)#
| rowspan=2|8.6(5) s
| β<sup>+</sup>
| <sup>122</sup>Ba
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup>, p
| <sup>121</sup>Cs
|-
| <sup>123</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 66
| 122.92624(21)#
| 17(3) s
| β<sup>+</sup>
| <sup>123</sup>Ba
| 11/2−#
|
|
|-
| <sup>124</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 67
| 123.92457(6)
| 29.21(17) s
| β<sup>+</sup>
| <sup>124</sup>Ba
| (7−,8−)
|
|
|-
| style="text-indent:1em" | <sup>124m</sup>La
| colspan="3" style="text-indent:2em" | 100(100)# keV
| 21(4) s
|
|
| low(+#)
|
|
|-
| <sup>125</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 68
| 124.920816(28)
| 64.8(12) s
| β<sup>+</sup>
| <sup>125</sup>Ba
| (11/2−)
|
|
|-
| style="text-indent:1em" | <sup>125m</sup>La
| colspan="3" style="text-indent:2em" | 107.0(10) keV
| 390(40) ms
|
|
| (3/2+)
|
|
|-
| <sup>126</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 69
| 125.91951(10)
| 54(2) s
| β<sup>+</sup>
| <sup>126</sup>Ba
| (5)(+#)
|
|
|-
| style="text-indent:1em" | <sup>126m</sup>La
| colspan="3" style="text-indent:2em" | 210(410) keV
| 20(20) s
|
|
| (0−,1−,2−)
|
|
|-
| <sup>127</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 70
| 126.916375(28)
| 5.1(1) min
| β<sup>+</sup>
| <sup>127</sup>Ba
| (11/2−)
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>127m</sup>La
| rowspan=2 colspan="3" style="text-indent:2em" | 14.8(12) keV
| rowspan=2|3.7(4) min
| β<sup>+</sup>
| <sup>127</sup>Ba
| rowspan=2|(3/2+)
| rowspan=2|
| rowspan=2|
|-
| [[이성질핵 전이|IT]]
| <sup>127</sup>La
|-
| <sup>128</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 71
| 127.91559(6)
| 5.18(14) min
| β<sup>+</sup>
| <sup>128</sup>Ba
| (5+)
|
|
|-
| style="text-indent:1em" | <sup>128m</sup>La
| colspan="3" style="text-indent:2em" | 100(100)# keV
| <1.4 min
| IT
| <sup>128</sup>La
| (1+,2−)
|
|
|-
| <sup>129</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 72
| 128.912693(22)
| 11.6(2) min
| β<sup>+</sup>
| <sup>129</sup>Ba
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>129m</sup>La
| colspan="3" style="text-indent:2em" | 172.1(4) keV
| 560(50) ms
| IT
| <sup>129</sup>La
| 11/2−
|
|
|-
| <sup>130</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 73
| 129.912369(28)
| 8.7(1) min
| β<sup>+</sup>
| '''''<sup>130</sup>Ba'''''
| 3(+)
|
|
|-
| <sup>131</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 74
| 130.91007(3)
| 59(2) min
| β<sup>+</sup>
| <sup>131</sup>Ba
| 3/2+
|
|
|-
| style="text-indent:1em" | <sup>131m</sup>La
| colspan="3" style="text-indent:2em" | 304.52(24) keV
| 170(10) µs
|
|
| 11/2−
|
|
|-
| <sup>132</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 75
| 131.91010(4)
| 4.8(2) h
| β<sup>+</sup>
| '''<sup>132</sup>Ba'''
| 2−
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>132m</sup>La
| rowspan=2 colspan="3" style="text-indent:2em" | 188.18(11) keV
| rowspan=2|24.3(5) min
| IT (76%)
| <sup>132</sup>La
| rowspan=2|6−
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (24%)
| '''<sup>132</sup>Ba'''
|-
| <sup>133</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 76
| 132.90822(3)
| 3.912(8) h
| β<sup>+</sup>
| <sup>133</sup>Ba
| 5/2+
|
|
|-
| <sup>134</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 77
| 133.908514(21)
| 6.45(16) min
| β<sup>+</sup>
| '''<sup>134</sup>Ba'''
| 1+
|
|
|-
| <sup>135</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 78
| 134.906977(11)
| 19.5(2) h
| β<sup>+</sup>
| '''<sup>135</sup>Ba'''
| 5/2+
|
|
|-
| <sup>136</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 79
| 135.90764(6)
| 9.87(3) min
| β<sup>+</sup>
| '''<sup>136</sup>Ba'''
| 1+
|
|
|-
| style="text-indent:1em" | <sup>136m</sup>La
| colspan="3" style="text-indent:2em" | 255(9) keV
| 114(3) ms
| IT
| <sup>136</sup>La
| (8)(−#)
|
|
|-
| <sup>137</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 80
| 136.906494(14)
| 6(2)E×10<sup>4</sup> a
| [[전자 포획|ε]]
| '''<sup>137</sup>Ba'''
| 7/2+
|
|
|-
| rowspan=2|<sup>138</sup>La<ref group="n">태양계 초창기부터 존재해 왔었던 방사성 핵자.</ref>
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 81
| rowspan=2|137.907112(4)
| rowspan=2|'''1.02(1)×10<sup>11</sup> a'''
| β<sup>+</sup> (66.4%)
| '''<sup>138</sup>Ba'''
| rowspan=2|5+
| rowspan=2|9.0(1)×10<sup>−4</sup>
| rowspan=2|
|-
| β<sup>-</sup> (33.6%)
| '''<sup>138</sup>Ce'''
|-
| style="text-indent:1em" | <sup>138m</sup>La
| colspan="3" style="text-indent:2em" | 72.57(3) keV
| 116(5) ns
|
|
| (3)+
|
|
|-
| <sup>139</sup>La<ref group="n" name="FP">핵분열 생성물</ref>
| style="text-align:right" | 57
| style="text-align:right" | 82
| 138.9063533(26)
| colspan=3 align=center|'''안정'''<ref group="n">이론적으로 [[자발 핵분열]]을 할 수 있다.</ref>
| 7/2+
| 0.99910(1)
|
|-
| <sup>140</sup>La<ref group="n" name="FP" />
| style="text-align:right" | 57
| style="text-align:right" | 83
| 139.9094776(26)
| 1.6781(3) d
| β<sup>-</sup>
| '''<sup>140</sup>Ce'''
| 3−
|
|
|-
| <sup>141</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 84
| 140.910962(5)
| 3.92(3) h
| β<sup>-</sup>
| <sup>141</sup>Ce
| (7/2+)
|
|
|-
| <sup>142</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 85
| 141.914079(6)
| 91.1(5) min
| β<sup>-</sup>
| '''<sup>142</sup>Ce'''
| 2−
|
|
|-
| <sup>143</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 86
| 142.916063(17)
| 14.2(1) min
| β<sup>-</sup>
| <sup>143</sup>Ce
| (7/2)+
|
|
|-
| <sup>144</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 87
| 143.91960(5)
| 40.8(4) s
| β<sup>-</sup>
| <sup>144</sup>Ce
| (3−)
|
|
|-
| <sup>145</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 88
| 144.92165(10)
| 24.8(20) s
| β<sup>-</sup>
| <sup>145</sup>Ce
| (5/2+)
|
|
|-
| rowspan=2|<sup>146</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 89
| rowspan=2|145.92579(8)
| rowspan=2|6.27(10) s
| β<sup>-</sup> (99.99%)
| <sup>146</sup>Ce
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, [[중성자 방출|n]] (0.007%)
| <sup>145</sup>Ce
|-
| style="text-indent:1em" | <sup>146m</sup>La
| colspan="3" style="text-indent:2em" | 130(130) keV
| 10.0(1) s
| β<sup>-</sup>
| <sup>146</sup>Ce
| (6−)
|
|
|-
| rowspan=2|<sup>147</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 90
| rowspan=2|146.92824(5)
| rowspan=2|4.015(8) s
| β<sup>-</sup> (99.96%)
| <sup>147</sup>Ce
| rowspan=2|(5/2+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (0.04%)
| <sup>146</sup>Ce
|-
| rowspan=2|<sup>148</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 91
| rowspan=2|147.93223(6)
| rowspan=2|1.26(8) s
| β<sup>-</sup> (99.85%)
| <sup>148</sup>Ce
| rowspan=2|(2−)
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (0.15%)
| <sup>147</sup>Ce
|-
| rowspan=2|<sup>149</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 92
| rowspan=2|148.93473(34)#
| rowspan=2|1.05(3) s
| β<sup>-</sup> (98.6%)
| <sup>149</sup>Ce
| rowspan=2|5/2+#
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (1.4%)
| <sup>148</sup>Ce
|-
| rowspan=2|<sup>150</sup>La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 93
| rowspan=2|149.93877(43)#
| rowspan=2|510(30) ms
| β<sup>-</sup> (97.3%)
| <sup>150</sup>Ce
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, n (2.7%)
| <sup>149</sup>Ce
|-
| <sup>151</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 94
| 150.94172(43)#
| 300# ms [>300 ns]
| β<sup>-</sup>
| <sup>151</sup>Ce
| 5/2+#
|
|
|-
| <sup>152</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 95
| 151.94625(43)#
| 200# ms [>300 ns]
| β<sup>-</sup>
| <sup>152</sup>Ce
|
|
|
|-
| <sup>153</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 96
| 152.94962(64)#
| 150# ms [>300 ns]
| β<sup>-</sup>
| <sup>153</sup>Ce
| 5/2+#
|
|
|-
| <sup>154</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 97
| 153.95450(64)#
| 100# ms
| β<sup>-</sup>
| <sup>154</sup>Ce
|
|
|
|-
| <sup>155</sup>La
| style="text-align:right" | 57
| style="text-align:right" | 98
| 154.95835(86)#
| 60# ms
| β<sup>-</sup>
| <sup>155</sup>Ce
| 5/2+#
|
|
|}
{{각주|group="n"}}

== 각주 ==
{{각주}}

{{동위 원소 색인}}

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