Isotop arsen

**[[Arsen]]** (**<sub>33</sub>As**) memiliki 33 isotop dan setidaknya 10 isomer yang diketahui. Namun, hanya satu dari isotop-isotop ini, 75As, yang stabil; oleh karena itu, arsen adalah unsur monoisotop dan mononuklida. Radioisotop yang berumur panjang adalah 73As dengan waktu paruh 80 hari. Arsen telah diusulkan sebagai bahan "penggaraman" untuk senjata nuklir (kobalt adalah bahan penggaraman lain yang lebih dikenal). Sebuah jaket 75As, diiradiasi oleh fluks neutron energi tinggi yang intens dari senjata termonuklir yang meledak, akan berubah menjadi isotop radioaktif 76As dengan waktu paruh 1,0778 hari dan menghasilkan radiasi gama sekitar 1,13 MeV, yang secara signifikan meningkatkan radioaktivitas luruhan senjata untuk beberapa jam. Senjata semacam itu tidak diketahui pernah dibuat, diuji, atau digunakan.

## Daftar isotop

|-
| 60As
| style="text-align:right" | 33
| style="text-align:right" | 27
| 59,99313(64)#
|
| p
| 59Ge
| 5+#
|
|
|-
| 61As
| style="text-align:right" | 33
| style="text-align:right" | 28
| 60,98062(64)#
|
| p
| 60Ge
| 3/2−#
|
|
|-
| 62As
| style="text-align:right" | 33
| style="text-align:right" | 29
| 61,97320(32)#
|
| p
| 61Ge
| 1+#
|
|
|-
| 63As
| style="text-align:right" | 33
| style="text-align:right" | 30
| 62,96369(54)#
|
| p
| 62Ge
| (3/2−)#
|
|
|-
| 64As
| style="text-align:right" | 33
| style="text-align:right" | 31
| 63,95757(38)#
| 40(30)&nbsp;mdtk[18(+43-7)&nbsp;mdtk]
| β<sup>+</sup>
| 64Ge
| 0+#
|
|
|-
| 65As
| style="text-align:right" | 33
| style="text-align:right" | 32
| 64,94956(32)#
| 170(30)&nbsp;mdtk
| β+
| 65Ge
| 3/2−#
|
|
|-
| 66As
| style="text-align:right" | 33
| style="text-align:right" | 33
| 65,94471(73)
| 95,77(23)&nbsp;mdtk
| β+
| 66Ge
| (0+)
|
|
|-
| style="text-indent:1em" | 66m1As
| colspan="3" style="text-indent:2em" | 1356,70(17)&nbsp;keV
| 1,1(1)&nbsp;µdtk
|
|
| (5+)
|
|
|-
| style="text-indent:1em" | 66m2As
| colspan="3" style="text-indent:2em" | 3023,9(3)&nbsp;keV
| 8,2(5)&nbsp;µdtk
|
|
| (9+)
|
|
|-
| 67As
| style="text-align:right" | 33
| style="text-align:right" | 34
| 66,93919(11)
| 42,5(12)&nbsp;dtk
| β+
| 67Ge
| (5/2−)
|
|
|-
| 68As
| style="text-align:right" | 33
| style="text-align:right" | 35
| 67,93677(5)
| 151,6(8)&nbsp;dtk
| β+
| 68Ge
| 3+
|
|
|-
| style="text-indent:1em" | 68mAs
| colspan="3" style="text-indent:2em" | 425,21(16)&nbsp;keV
| 111(20)&nbsp;ndtk[?107(+23-16)&nbsp;ndtk]
|
|
| 1+
|
|
|-
| 69As
| style="text-align:right" | 33
| style="text-align:right" | 36
| 68,93227(3)
| 15,2(2)&nbsp;mnt
| β+
| 69Ge
| 5/2−
|
|
|-
| 70As
| style="text-align:right" | 33
| style="text-align:right" | 37
| 69,93092(5)
| 52,6(3)&nbsp;mnt
| β+
| **<sup>70</sup>Ge**
| 4(+#)
|
|
|-
| style="text-indent:1em" | 70mAs
| colspan="3" style="text-indent:2em" | 32,008(23)&nbsp;keV
| 96(3)&nbsp;µdtk
|
|
| 2(+)
|
|
|-
| 71As
| style="text-align:right" | 33
| style="text-align:right" | 38
| 70,927112(5)
| 65,28(15)&nbsp;jam
| β+
| 71Ge
| 5/2−
|
|
|-
| 72As
| style="text-align:right" | 33
| style="text-align:right" | 39
| 71,926752(5)
| 26,0(1)&nbsp;jam
| β+
| **<sup>72</sup>Ge**
| 2−
|
|
|-
| 73As
| style="text-align:right" | 33
| style="text-align:right" | 40
| 72,923825(4)
| 80,30(6)&nbsp;hri
| EC
| **<sup>73</sup>Ge**
| 3/2−
|
|
|-
| rowspan=2|74As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 41
| rowspan=2|73,9239287(25)
| rowspan=2|17,77(2)&nbsp;hri
| β+ (66%)
| **<sup>74</sup>Ge**
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| β− (34%)
| **<sup>74</sup>Se**
|-
| 75As
| style="text-align:right" | 33
| style="text-align:right" | 42
| 74,9215965(20)
| colspan=3 align=center|**Stabil**
| 3/2−
| 1,0000
|
|-
| style="text-indent:1em" | 75mAs
| colspan="3" style="text-indent:2em" | 303,9241(7)&nbsp;keV
| 17,62(23)&nbsp;mdtk
|
|
| 9/2+
|
|
|-
| rowspan=2|76As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 43
| rowspan=2|75,922394(2)
| rowspan=2|1,0942(7)&nbsp;hri
| β− (99,98%)
| **<sup>76</sup>Se**
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| EC (0,02%)
| ***<sup>76</sup>Ge***
|-
| style="text-indent:1em" | 76mAs
| colspan="3" style="text-indent:2em" | 44,425(1)&nbsp;keV
| 1,84(6)&nbsp;µdtk
|
|
| (1)+
|
|
|-
| 77As
| style="text-align:right" | 33
| style="text-align:right" | 44
| 76,9206473(25)
| 38,83(5)&nbsp;jam
| β−
| 77mSe
| 3/2−
|
|
|-
| style="text-indent:1em" | 77mAs
| colspan="3" style="text-indent:2em" | 475,443(16)&nbsp;keV
| 114,0(25)&nbsp;µdtk
|
|
| 9/2+
|
|
|-
| 78As
| style="text-align:right" | 33
| style="text-align:right" | 45
| 77,921827(11)
| 90,7(2)&nbsp;mnt
| β−
| **<sup>78</sup>Se**
| 2−
|
|
|-
| 79As
| style="text-align:right" | 33
| style="text-align:right" | 46
| 78,920948(6)
| 9,01(15)&nbsp;mnt
| β−
| 79mSe
| 3/2−
|
|
|-
| style="text-indent:1em" | 79mAs
| colspan="3" style="text-indent:2em" | 772,81(6)&nbsp;keV
| 1,21(1)&nbsp;µdtk
|
|
| (9/2)+
|
|
|-
| 80As
| style="text-align:right" | 33
| style="text-align:right" | 47
| 79,922534(25)
| 15,2(2)&nbsp;dtk
| β−
| **<sup>80</sup>Se**
| 1+
|
|
|-
| 81As
| style="text-align:right" | 33
| style="text-align:right" | 48
| 80,922132(6)
| 33,3(8)&nbsp;dtk
| β−
| 81mSe
| 3/2−
|
|
|-
| 82As
| style="text-align:right" | 33
| style="text-align:right" | 49
| 81,92450(21)
| 19,1(5)&nbsp;dtk
| β−
| ***<sup>82</sup>Se***
| (1+)
|
|
|-
| style="text-indent:1em" | 82mAs
| colspan="3" style="text-indent:2em" | 250(200) keV
| 13,6(4)&nbsp;dtk
| β−
| ***<sup>82</sup>Se***
| (5-)
|
|
|-
| 83As
| style="text-align:right" | 33
| style="text-align:right" | 50
| 82,92498(24)
| 13,4(3)&nbsp;dtk
| β−
| 83mSe
| 3/2−#
|
|
|-
| rowspan=2|84As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 51
| rowspan=2|83,92906(32)#
| rowspan=2|4,02(3)&nbsp;dtk
| β− (99,721%)
| 84Se
| rowspan=2|(3)(+#)
| rowspan=2|
| rowspan=2|
|-
| β−, n (0,279%)
| 83Se
|-
| style="text-indent:1em" | 84mAs
| colspan="3" style="text-indent:2em" | 0(100)# keV
| 650(150)&nbsp;mdtk
|
|
|
|
|
|-
| rowspan=2|85As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 52
| rowspan=2|84,93202(21)#
| rowspan=2|2,021(10)&nbsp;dtk
| β−, n (59,4%)
| 84Se
| rowspan=2|(3/2−)#
| rowspan=2|
| rowspan=2|
|-
| β− (40,6%)
| 85Se
|-
| rowspan=2|86As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 53
| rowspan=2|85,93650(32)#
| rowspan=2|0,945(8)&nbsp;dtk
| β− (67%)
| 86Se
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β−, n (33%)
| 85Se
|-
| rowspan=2|87As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 54
| rowspan=2|86,93990(32)#
| rowspan=2|0,56(8)&nbsp;dtk
| β− (84,6%)
| 87Se
| rowspan=2|3/2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n (15,4%)
| 86Se
|-
| rowspan=2|88As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 55
| rowspan=2|87,94494(54)#
| rowspan=2|300#&nbsp;mdtk[>300&nbsp;ndtk]
| β−
| 88Se
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β−, n
| 87Se
|-
| 89As
| style="text-align:right" | 33
| style="text-align:right" | 56
| 88,94939(54)#
| 200#&nbsp;mdtk[>300&nbsp;ndtk]
| β−
| 89Se
| 3/2−#
|
|
|-
| 90As
| style="text-align:right" | 33
| style="text-align:right" | 57
| 89,95550(86)#
| 80#&nbsp;mdtk[>300&nbsp;ndtk]
|
|
|
|
|
|-
| 91As
| style="text-align:right" | 33
| style="text-align:right" | 58
| 90,96043(97)#
| 50#&nbsp;mdtk[>300&nbsp;ndtk]
|
|
| 3/2−#
|
|
|-
| 92As
| style="text-align:right" | 33
| style="text-align:right" | 59
| 91,96680(97)#
| 30#&nbsp;mdtk[>300&nbsp;ndtk]
|
|
|
|
|

## Referensi

* Massa isotop dari:
**
* Komposisi isotop dan massa atom standar dari:
**
**
* Data waktu paruh, spin, dan isomer dipilih dari sumber-sumber berikut.
**
**
**
* A. Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. *Discovery of the Arsenic Isotopes.* arXiv:0902.4361.