Uraan-235 (U-235) is 'n isotoop van uraan wat ongeveer 0,72% van natuurlike uraan beslaan. Anders as uraan-238 is hierdie isotoop kernsplytbaar ; dit kan wel onderhou word deur die splitsing van atoomkerne in 'n kernkettingreaksie.
'n Skyf uraan wat met uraan-235 verryk is. Natuurlike vervalketting
wysig
U
92
235
→
7.038
×
10
8
y
α
Th
90
231
→
25.52
h
β
−
Pa
91
231
→
3.276
×
10
4
y
α
Ac
89
227
{
→
21.773
y
98.62
%
β
−
Th
90
227
→
18.718
d
α
→
21.773
y
1.38
%
α
Fr
87
223
→
21.8
min
β
−
}
Ra
88
223
→
11.434
d
α
Rn
86
219
Rn
86
219
→
3.96
s
α
Po
84
215
→
1.778
ms
α
Pb
82
211
→
36.1
min
β
−
Bi
83
211
{
→
2.13
min
99.73
%
α
Tl
81
207
→
4.77
min
β
−
→
2.13
min
0.27
%
β
−
Po
84
211
→
0.516
s
α
}
Pb
(
stabiel
)
82
207
{\displaystyle {\begin{array}{r}{\ce {^{235}_{92}U->[\alpha ][7.038\times 10^{8}\ {\ce {y}}]{^{231}_{90}Th}->[\beta ^{-}][25.52\ {\ce {h}}]{^{231}_{91}Pa}->[\alpha ][3.276\times 10^{4}\ {\ce {y}}]{^{227}_{89}Ac}}}{\begin{Bmatrix}{\ce {->[98.62\%\beta ^{-}][21.773\ {\ce {y}}]{^{227}_{90}Th}->[\alpha ][18.718\ {\ce {d}}]}}\\{\ce {->[1.38\%\alpha ][21.773\ {\ce {y}}]{^{223}_{87}Fr}->[\beta ^{-}][21.8\ {\ce {min}}]}}\end{Bmatrix}}{\ce {^{223}_{88}Ra->[\alpha ][11.434\ {\ce {d}}]{^{219}_{86}Rn}}}\\{\ce {^{219}_{86}Rn->[\alpha ][3.96\ {\ce {s}}]{^{215}_{84}Po}->[\alpha ][1.778\ {\ce {ms}}]{^{211}_{82}Pb}->[\beta ^{-}][36.1\ {\ce {min}}]{^{211}_{83}Bi}}}{\begin{Bmatrix}{\ce {->[99.73\%\alpha ][2.13\ {\ce {min}}]{^{207}_{81}Tl}->[\beta ^{-}][4.77\ {\ce {min}}]}}\\{\ce {->[0.27\%\beta ^{-}][2.13\ {\ce {min}}]{^{211}_{84}Po}->[\alpha ][0.516\ {\ce {s}}]}}\end{Bmatrix}}{\ce {^{207}_{82}Pb_{(stabiel)}}}\end{array}}}
Valindaba , Suid-Afrikaanse aanleg waar uraan-235 vervaardig is.
![{\displaystyle {\begin{array}{r}{\ce {^{235}_{92}U->[\alpha ][7.038\times 10^{8}\ {\ce {y}}]{^{231}_{90}Th}->[\beta ^{-}][25.52\ {\ce {h}}]{^{231}_{91}Pa}->[\alpha ][3.276\times 10^{4}\ {\ce {y}}]{^{227}_{89}Ac}}}{\begin{Bmatrix}{\ce {->[98.62\%\beta ^{-}][21.773\ {\ce {y}}]{^{227}_{90}Th}->[\alpha ][18.718\ {\ce {d}}]}}\\{\ce {->[1.38\%\alpha ][21.773\ {\ce {y}}]{^{223}_{87}Fr}->[\beta ^{-}][21.8\ {\ce {min}}]}}\end{Bmatrix}}{\ce {^{223}_{88}Ra->[\alpha ][11.434\ {\ce {d}}]{^{219}_{86}Rn}}}\\{\ce {^{219}_{86}Rn->[\alpha ][3.96\ {\ce {s}}]{^{215}_{84}Po}->[\alpha ][1.778\ {\ce {ms}}]{^{211}_{82}Pb}->[\beta ^{-}][36.1\ {\ce {min}}]{^{211}_{83}Bi}}}{\begin{Bmatrix}{\ce {->[99.73\%\alpha ][2.13\ {\ce {min}}]{^{207}_{81}Tl}->[\beta ^{-}][4.77\ {\ce {min}}]}}\\{\ce {->[0.27\%\beta ^{-}][2.13\ {\ce {min}}]{^{211}_{84}Po}->[\alpha ][0.516\ {\ce {s}}]}}\end{Bmatrix}}{\ce {^{207}_{82}Pb_{(stabiel)}}}\end{array}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4d9b29b246b83a659a5628cdac89f2312d34081f)
