Изотопи на лантанот

Природниот лантан (<sub>57</sub>La) е составен од еден стабилен (<sup>139</sup>La) и еден радиоактивен (<sup>138</sup>La) изотоп, а најзастапен е стабилниот изотоп, <sup>139</sup>La (99,91% природна застапеност). Има 39 радиоизотопи кои се карактеризирани, при што најстабилен е <sup>138</sup>La, со време на полураспад од 1,03×10<sup>11</sup> години; <sup>137</sup>La, со време на полураспад од 60.000 години и <sup>140</sup>La, со време на полураспадод 1.6781 дена. Останатите радиоактивни изотопи имаат време на полураспад помало од еден ден, а поголемиот дел од нив имаат време на полураспад помало од 1 минута. Овој елемент има и 12 јадрени изомери, од кои најдолготрајниот е <sup>132m</sup>La, со време на полураспад од 24,3 минути. Полесните изотопи главно се распаѓаат до изотопи на бариумот, а тешките најчесто се распаѓаат до изотопи на цериумот. <sup>138</sup>La може да се распадне и на двата.
Изотопите на лантан се движат по атомска тежина од 115,96 u (<sup>116</sup>La) до 154,96 u (<sup>155</sup>La).
1 Список на изотопите
<sup>116</sup>La<ref, 57, 59, 115,95701(35)#, 50(22) мс, p (~60%), <sup>115</sup>Ba
β<sup>+</sup> (~40%), <sup>116</sup>Ba
<sup>116m</sup>La<ref, 182 keV, IT, <sup>116</sup>La
<sup>117</sup>La<ref, 57, 60, 116,95033(22)#, 21,6(31) мс, p (94%), <sup>116</sup>Ba, (3/2+)
β<sup>+</sup> (6%), <sup>117</sup>Ba
<sup>117m</sup>La<ref, 192 keV, IT, <sup>117</sup>La, (7/2−)
<sup>120</sup>La, 57, 63, 119,93820(32)#, 2,8(2) с, β<sup>+</sup>, <sup>120</sup>Ba, 4+<ref
β<sup>+</sup>, p (?%), <sup>119</sup>Cs
<sup>121</sup>La, 57, 64, 120,93324(32)#, 5,3(2) с, β<sup>+</sup>, <sup>121</sup>Ba, 11/2−#
<sup>122</sup>La, 57, 65, 121,93071(32)#, 8,6(5) с, β<sup>+</sup>, <sup>122</sup>Ba, 2+<ref
β<sup>+</sup>, p (?%), <sup>121</sup>Cs
<sup>123</sup>La, 57, 66, 122,92630(21)#, 17(3) с, β<sup>+</sup>, <sup>123</sup>Ba, 11/2−#
<sup>124</sup>La, 57, 67, 123,924574(61), 29,21(17) с, β<sup>+</sup>, <sup>124</sup>Ba, (7−, 8−)
<sup>124m</sup>La, 100(100)# keV, 21(4) с, β<sup>+</sup>, <sup>124</sup>Ba, 2−#
<sup>125</sup>La, 57, 68, 124,920816(28), 64,8(12) с, β<sup>+</sup>, <sup>125</sup>Ba, 11/2−#
<sup>125m</sup>La, 107,00(10) keV, 390(40) мс, IT, <sup>125</sup>La, (3/2+)
<sup>126</sup>La, 57, 69, 125,919513(97), 54(2) с, β<sup>+</sup>, <sup>126</sup>Ba, 5−#
<sup>126m</sup>La, 210(410) keV, 20(20) с, β<sup>+</sup>, <sup>126</sup>Ba, 1−#
<sup>127</sup>La, 57, 70, 126,916375(28), 5,1(1) мин, β<sup>+</sup>, <sup>127</sup>Ba, (11/2−)
<sup>127m</sup>La, 14,2(4) keV, 3,7(4) мин, β<sup>+</sup>, <sup>127</sup>Ba, (3/2+)
<sup>128</sup>La, 57, 71, 127,915592(58), 5,18(14) мин, β<sup>+</sup>, <sup>128</sup>Ba, (5+)
<sup>128m</sup>La, 100(100)# keV, <1,4 мин, β<sup>+</sup>, <sup>128</sup>Ba, (1+, 2−)
<sup>129</sup>La, 57, 72, 128,912696(23), 11,6(2) мин, β<sup>+</sup>, <sup>129</sup>Ba, (3/2+)
<sup>129m</sup>La, 172,33(20) keV, 560(50) мс, IT, <sup>129</sup>La, (11/2−)
<sup>130</sup>La, 57, 73, 129,912369(28), 8,7(1) мин, β<sup>+</sup>, ''<sup>130</sup>Ba'', 3(+)
<sup>130m</sup>La, 214,0(5) keV, 742(28) нс, IT, <sup>130</sup>La, (5+)
<sup>131</sup>La, 57, 74, 130,910070(30), 59(2) мин, β<sup>+</sup>, <sup>131</sup>Ba, 3/2+
<sup>131m</sup>La, 304,52(24) keV, 170(10) μс, IT, <sup>131</sup>La, 11/2−
<sup>132</sup>La, 57, 75, 131,910119(39), 4,59(4) ч, β<sup>+</sup>, <sup>132</sup>Ba, 2−
<sup>132m</sup>La, 188,20(11) keV, 24,3(5) мин, IT (76%), <sup>132</sup>La, 6−
β<sup>+</sup> (24%), <sup>132</sup>Ba
<sup>133</sup>La, 57, 76, 132,908218(30), 3,912(8) ч, β<sup>+</sup>, <sup>133</sup>Ba, 5/2+
<sup>134</sup>La, 57, 77, 133,908514(21), 6,45(16) мин, β<sup>+</sup>, <sup>134</sup>Ba, 1+
<sup>134m</sup>La, 440(100)# keV, 29(4) μс, IT, <sup>134</sup>La, (6−)
<sup>135</sup>La, 57, 78, 134,906984(10), 18,91(2) ч, β<sup>+</sup>, <sup>135</sup>Ba, 5/2+
<sup>136</sup>La, 57, 79, 135,907635(57), 9,87(3) мин, β<sup>+</sup>, <sup>136</sup>Ba, 1+
<sup>136m1</sup>La, 259,5(3) keV, 114(5) мс, IT, <sup>136</sup>La, (7−)
<sup>136m2</sup>La, 2520,6(4) keV, 187(27) нс, IT, <sup>136</sup>La, (14+)
<sup>137</sup>La, 57, 80, 136,9064504(18), 6(2)×10<sup>4</sup> г, EC, <sup>137</sup>Ba, 7/2+
<sup>137m</sup>La, 1869,50(21) keV, 342(25) нс, IT, <sup>137</sup>La, 19/2−
<sup>138</sup>La, 57, 81, 137,90712404(45), 1,03(1)×10<sup>11</sup> г, β<sup>+</sup> (65,5%), <sup>138</sup>Ba, 5+, 8,881(71)×10<sup>−4</sup>
β<sup>−</sup> (34,5%), <sup>138</sup>Ce
<sup>138m1</sup>La, 72,57(3) keV, 116(5) нс, IT, ''<sup>138</sup>La'', (3)+
<sup>138m2</sup>La, 738,80(20) keV, 2,0(3) μс, IT, ''<sup>138</sup>La'', 7−
<sup>139</sup>La, 57, 82, 138,90636293(65), Стабилен, 7/2+, 0,9991119(71)
<sup>139m</sup>La, 1800,4(4) keV, 315(35) нс, IT, <sup>139</sup>La, (17/2+)
<sup>140</sup>La, 57, 83, 139,90948729(65), 40,289(4) ч, β<sup>−</sup>, <sup>140</sup>Ce, 3−
<sup>141</sup>La, 57, 84, 140,9109712(44), 3,92(3) ч, β<sup>−</sup>, <sup>141</sup>Ce, (7/2+)
<sup>142</sup>La, 57, 85, 141,9140908(67), 91,1(5) мин, β<sup>−</sup>, <sup>142</sup>Ce, 2−
<sup>142m</sup>La, 145,82(8) keV, 0,87(17) μс, IT, <sup>142</sup>La, (4)−
<sup>143</sup>La, 57, 86, 142,9160795(79), 14,2(1) мин, β<sup>−</sup>, <sup>143</sup>Ce, (7/2)+
<sup>144</sup>La, 57, 87, 143,919646(14), 44,0(7) с, β<sup>−</sup>, <sup>144</sup>Ce, (3−)
<sup>145</sup>La, 57, 88, 144,921808(13), 24,8(20) с, β<sup>−</sup>, <sup>145</sup>Ce, (5/2+)
<sup>146</sup>La, 57, 89, 145,9256880(18), 9,9(1) с, β<sup>−</sup>, <sup>146</sup>Ce, (5−)
<sup>146m</sup>La, 141,5(24) keV, 6,08(22) с, β<sup>−</sup>, <sup>146</sup>Ce, (1−, 2−)
<sup>147</sup>La, 57, 90, 146,928418(12), 4,026(20) с, β<sup>−</sup> (99,96%), <sup>147</sup>Ce, (5/2+)
β<sup>−</sup>, n (0,041%), <sup>146</sup>Ce
<sup>148</sup>La, 57, 91, 147,932679(21), 1,414(25) с, β<sup>−</sup> (99,82%), <sup>148</sup>Ce, (2−)
β<sup>−</sup>, n (0,18%), <sup>147</sup>Ce
<sup>149</sup>La, 57, 92, 148,93535(21), 1,071(22) с, β<sup>−</sup> (98,57%), <sup>149</sup>Ce, (3/2−)
β<sup>−</sup>, n (1,43%), <sup>148</sup>Ce
<sup>150</sup>La, 57, 93, 149,9395475(27), 504(15) мс, β<sup>−</sup> (97,3%), <sup>150</sup>Ce, (3+)
β<sup>−</sup>, n (2,7%), <sup>149</sup>Ce
<sup>151</sup>La, 57, 94, 150,94277(47), 465(24) мс, β<sup>−</sup>, <sup>151</sup>Ce, 1/2+#
<sup>152</sup>La, 57, 95, 151,94709(32)#, 287(16) мс, β<sup>−</sup>, <sup>152</sup>Ce, 2−#
<sup>153</sup>La, 57, 96, 152,95055(32)#, 245(18) мс, β<sup>−</sup>, <sup>153</sup>Ce, 1/2+#
<sup>154</sup>La, 57, 97, 153,95542(32)#, 161(15) мс, β<sup>−</sup>, <sup>154</sup>Ce, 2−#
<sup>155</sup>La, 57, 98, 154,95928(43)#, 101(28) мс, β<sup>−</sup>, <sup>155</sup>Ce, 1/2+#
<sup>156</sup>La, 57, 99, 155,96452(43)#, 84(78) мс, β<sup>−</sup>, <sup>156</sup>Ce, 4+#
<sup>157</sup>La, 57, 100, 156,96879(32)#, 30# мс[>550 нс], 1/2+#