Isotop lantanum

**[[Lantanum]]** (**<sub>57</sub>La**) yang terbentuk secara alami terdiri dari satu isotop stabil (139La) dan satu isotop radioaktif (138La), dengan isotop yang stabil, 139La, menjadi yang paling melimpah (99,91% kelimpahan alami). Ada 38 radioisotop yang telah dikarakterisasi, dengan yang paling stabil adalah 138La, dengan waktu paruh 1,02 tahun; 137La, dengan waktu paruh 60.000 tahun; dan 140La, dengan waktu paruh 1,6781 hari. Isotop radioaktif yang tersisa memiliki waktu paruh kurang dari satu hari dan sebagian besar memiliki waktu paruh kurang dari 1 menit. Unsur ini juga memiliki 12 isomer nuklir, yang berumur paling panjang adalah 132mLa, dengan waktu paruh 24,3 menit.

Isotop lantanum memiliki berat atom berkisar dari 116,95&nbsp;u (117La) hingga 154,96&nbsp;u (155La).

## Daftar isotop

|-
| rowspan=2|117La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 60
| rowspan=2|116,95007(43)#
| rowspan=2|23,5(26)&nbsp;mdtk
| β<sup>+</sup>
| 117Ba
| rowspan=2|(3/2+, 3/2−)
| rowspan=2|
| rowspan=2|
|-
| p
| 116Ba
|-
| style="text-indent:1em" | 117mLa
| colspan="3" style="text-indent:2em" | 151(12)&nbsp;keV
| 10(5)&nbsp;mdtk
|
|
| (9/2+)
|
|
|-
| 118La
| style="text-align:right" | 57
| style="text-align:right" | 61
| 117,94673(32)#
| 200#&nbsp;mdtk
| β+
| 118Ba
|
|
|
|-
| 119La
| style="text-align:right" | 57
| style="text-align:right" | 62
| 118,94099(43)#
| 1# dtk
| β+
| 119Ba
| 11/2−#
|
|
|-
| rowspan=2|120La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 63
| rowspan=2|119,93807(54)#
| rowspan=2|2,8(2)&nbsp;dtk
| β+
| 120Ba
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β+, p
| 119Cs
|-
| rowspan=2|121La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 64
| rowspan=2|120,93301(54)#
| rowspan=2|5,3(2)&nbsp;dtk
| β+
| 121Ba
| rowspan=2|11/2−#
| rowspan=2|
| rowspan=2|
|-
| β+, p
| 120Cs
|-
| rowspan=2|122La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 65
| rowspan=2|121,93071(32)#
| rowspan=2|8,6(5)&nbsp;dtk
| β+
| 122Ba
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β+, p
| 121Cs
|-
| 123La
| style="text-align:right" | 57
| style="text-align:right" | 66
| 122,92624(21)#
| 17(3)&nbsp;dtk
| β+
| 123Ba
| 11/2−#
|
|
|-
| 124La
| style="text-align:right" | 57
| style="text-align:right" | 67
| 123,92457(6)
| 29,21(17)&nbsp;dtk
| β+
| 124Ba
| (7−, 8−)
|
|
|-
| style="text-indent:1em" | 124mLa
| colspan="3" style="text-indent:2em" | 100(100)#&nbsp;keV
| 21(4)&nbsp;dtk
|
|
| low(+#)
|
|
|-
| 125La
| style="text-align:right" | 57
| style="text-align:right" | 68
| 124,920816(28)
| 64,8(12)&nbsp;dtk
| β+
| 125Ba
| (11/2−)
|
|
|-
| style="text-indent:1em" | 125mLa
| colspan="3" style="text-indent:2em" | 107,0(10)&nbsp;keV
| 390(40)&nbsp;mdtk
|
|
| (3/2+)
|
|
|-
| 126La
| style="text-align:right" | 57
| style="text-align:right" | 69
| 125,91951(10)
| 54(2)&nbsp;dtk
| β+
| 126Ba
| (5)(+#)
|
|
|-
| style="text-indent:1em" | 126mLa
| colspan="3" style="text-indent:2em" | 210(410)&nbsp;keV
| 20(20)&nbsp;dtk
|
|
| (0−, 1−, 2−)
|
|
|-
| 127La
| style="text-align:right" | 57
| style="text-align:right" | 70
| 126,916375(28)
| 5,1(1)&nbsp;mnt
| β+
| 127Ba
| (11/2−)
|
|
|-
| rowspan=2 style="text-indent:1em" | 127mLa
| rowspan=2 colspan="3" style="text-indent:2em" | 14,8(12)&nbsp;keV
| rowspan=2|3,7(4)&nbsp;mnt
| β+
| 127Ba
| rowspan=2|(3/2+)
| rowspan=2|
| rowspan=2|
|-
| IT
| 127La
|-
| 128La
| style="text-align:right" | 57
| style="text-align:right" | 71
| 127,91559(6)
| 5,18(14)&nbsp;mnt
| β+
| 128Ba
| (5+)
|
|
|-
| style="text-indent:1em" | 128mLa
| colspan="3" style="text-indent:2em" | 100(100)#&nbsp;keV
| 128La
| (1+, 2−)
|
|
|-
| 129La
| style="text-align:right" | 57
| style="text-align:right" | 72
| 128,912693(22)
| 11,6(2)&nbsp;mnt
| β+
| 129Ba
| 3/2+
|
|
|-
| style="text-indent:1em" | 129mLa
| colspan="3" style="text-indent:2em" | 172,1(4)&nbsp;keV
| 560(50)&nbsp;mdtk
| IT
| 129La
| 11/2−
|
|
|-
| 130La
| style="text-align:right" | 57
| style="text-align:right" | 73
| 129,912369(28)
| 8,7(1)&nbsp;mnt
| β+
| ***<sup>130</sup>Ba***
| 3(+)
|
|
|-
| 131La
| style="text-align:right" | 57
| style="text-align:right" | 74
| 130,91007(3)
| 59(2)&nbsp;mnt
| β+
| 131Ba
| 3/2+
|
|
|-
| style="text-indent:1em" | 131mLa
| colspan="3" style="text-indent:2em" | 304,52(24)&nbsp;keV
| 170(10)&nbsp;μdtk
|
|
| 11/2−
|
|
|-
| 132La
| style="text-align:right" | 57
| style="text-align:right" | 75
| 131,91010(4)
| 4,8(2)&nbsp;jam
| β+
| **<sup>132</sup>Ba**
| 2−
|
|
|-
| rowspan=2 style="text-indent:1em" | 132mLa
| rowspan=2 colspan="3" style="text-indent:2em" | 188,18(11)&nbsp;keV
| rowspan=2|24,3(5)&nbsp;mnt
| IT (76%)
| 132La
| rowspan=2|6−
| rowspan=2|
| rowspan=2|
|-
| β+ (24%)
| **<sup>132</sup>Ba**
|-
| 133La
| style="text-align:right" | 57
| style="text-align:right" | 76
| 132,90822(3)
| 3,912(8)&nbsp;jam
| β+
| 133Ba
| 5/2+
|
|
|-
| 134La
| style="text-align:right" | 57
| style="text-align:right" | 77
| 133,908514(21)
| 6,45(16)&nbsp;mnt
| β+
| **<sup>134</sup>Ba**
| 1+
|
|
|-
| 135La
| style="text-align:right" | 57
| style="text-align:right" | 78
| 134,906977(11)
| 19,5(2)&nbsp;jam
| β+
| **<sup>135</sup>Ba**
| 5/2+
|
|
|-
| 136La
| style="text-align:right" | 57
| style="text-align:right" | 79
| 135,90764(6)
| 9,87(3)&nbsp;mnt
| β+
| **<sup>136</sup>Ba**
| 1+
|
|
|-
| style="text-indent:1em" | 136mLa
| colspan="3" style="text-indent:2em" | 255(9)&nbsp;keV
| 114(3)&nbsp;mdtk
| IT
| 136La
| (8)(−#)
|
|
|-
| 137La
| style="text-align:right" | 57
| style="text-align:right" | 80
| 136,906494(14)
| 6(2) thn
| EC
| **<sup>137</sup>Ba**
| 7/2+
|
|
| punah
|-
| rowspan=2|138La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 81
| rowspan=2|137,907112(4)
| rowspan=2|**1,02(1) thn**
| β+ (66,4%)
| **<sup>138</sup>Ba**
| rowspan=2|5+
| rowspan=2|9,0(1)
| rowspan=2|
|-
| β− (33,6%)
| **<sup>138</sup>Ce**
|-
| style="text-indent:1em" | 138mLa
| colspan="3" style="text-indent:2em" | 72,57(3)&nbsp;keV
| 116(5)&nbsp;ndtk
|
|
| (3)+
|
|
|-
| 139La
| style="text-align:right" | 57
| style="text-align:right" | 82
| 138,9063533(26)
| colspan=3 align=center|**Stabil**
| 7/2+
| 0,99910(1)
|
|-
| 140La
| style="text-align:right" | 57
| style="text-align:right" | 83
| 139,9094776(26)
| 1,6781(3)&nbsp;hri
| β−
| **<sup>140</sup>Ce**
| 3−
|
|
|-
| 141La
| style="text-align:right" | 57
| style="text-align:right" | 84
| 140,910962(5)
| 3,92(3)&nbsp;jam
| β−
| 141Ce
| (7/2+)
|
|
|-
| 142La
| style="text-align:right" | 57
| style="text-align:right" | 85
| 141,914079(6)
| 91,1(5)&nbsp;mnt
| β−
| **<sup>142</sup>Ce**
| 2−
|
|
|-
| 143La
| style="text-align:right" | 57
| style="text-align:right" | 86
| 142,916063(17)
| 14,2(1)&nbsp;mnt
| β−
| 143Ce
| (7/2)+
|
|
|-
| 144La
| style="text-align:right" | 57
| style="text-align:right" | 87
| 143,91960(5)
| 40,8(4)&nbsp;dtk
| β−
| 144Ce
| (3−)
|
|
|-
| 145La
| style="text-align:right" | 57
| style="text-align:right" | 88
| 144,92165(10)
| 24,8(20)&nbsp;dtk
| β−
| 145Ce
| (5/2+)
|
|
|-
| rowspan=2|146La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 89
| rowspan=2|145,92579(8)
| rowspan=2|6,27(10)&nbsp;dtk
| β− (99,99%)
| 146Ce
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| β−, n (0,007%)
| 145Ce
|-
| style="text-indent:1em" | 146mLa
| colspan="3" style="text-indent:2em" | 130(130)&nbsp;keV
| 10,0(1)&nbsp;dtk
| β−
| 146Ce
| (6−)
|
|
|-
| rowspan=2|147La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 90
| rowspan=2|146,92824(5)
| rowspan=2|4,015(8)&nbsp;dtk
| β− (99,96%)
| 147Ce
| rowspan=2|(5/2+)
| rowspan=2|
| rowspan=2|
|-
| β−, n (0,04%)
| 146Ce
|-
| rowspan=2|148La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 91
| rowspan=2|147,93223(6)
| rowspan=2|1,26(8)&nbsp;dtk
| β− (99,85%)
| 148Ce
| rowspan=2|(2−)
| rowspan=2|
| rowspan=2|
|-
| β−, n (0,15%)
| 147Ce
|-
| rowspan=2|149La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 92
| rowspan=2|148,93473(34)#
| rowspan=2|1,05(3)&nbsp;dtk
| β− (98,6%)
| 149Ce
| rowspan=2|5/2+#
| rowspan=2|
| rowspan=2|
|-
| β−, n (1,4%)
| 148Ce
|-
| rowspan=2|150La
| rowspan=2 style="text-align:right" | 57
| rowspan=2 style="text-align:right" | 93
| rowspan=2|149,93877(43)#
| rowspan=2|510(30)&nbsp;mdtk
| β− (97,3%)
| 150Ce
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β−, n (2,7%)
| 149Ce
|-
| 151La
| style="text-align:right" | 57
| style="text-align:right" | 94
| 150,94172(43)#
| 300#&nbsp;mdtk [>300&nbsp;ndtk]
| β−
| 151Ce
| 5/2+#
|
|
|-
| 152La
| style="text-align:right" | 57
| style="text-align:right" | 95
| 151,94625(43)#
| 200#&nbsp;mdtk [>300&nbsp;ndtk]
| β−
| 152Ce
|
|
|
|-
| 153La
| style="text-align:right" | 57
| style="text-align:right" | 96
| 152,94962(64)#
| 150#&nbsp;mdtk [>300&nbsp;ndtk]
| β−
| 153Ce
| 5/2+#
|
|
|-
| 154La
| style="text-align:right" | 57
| style="text-align:right" | 97
| 153,95450(64)#
| 100#&nbsp;mdtk
| β−
| 154Ce
|
|
|
|-
| 155La
| style="text-align:right" | 57
| style="text-align:right" | 98
| 154,95835(86)#
| 60#&nbsp;mdtk
| β−
| 155Ce
| 5/2+#
|
|

## Referensi

* Massa isotop dari:
**
* Komposisi isotop dan massa atom standar dari:
**
**
* Data waktu paruh, spin, dan isomer dipilih dari sumber-sumber berikut.
**
**
**