Uranium actinium series

The uranium - actinium series is the natural decay series of the uranium isotope 235 or (4n + 3) series.

It can be extended “backwards” to the artificial transuranium elements : the mother nuclide of uranium-235 is plutonium-239 , which is produced in large quantities in nuclear reactors . This can in turn have arisen from other mother nuclides , which are not shown here (first extension in red ).
The end nuclide of the series is the lead isotope ²⁰⁷ Pb.

Natural radioactive decay series: uranium-actinium series (green)

(4n + 3) row

Natural decay series of ²³⁵ U (the very improbable series over the isotope ²²⁷ Ra is not shown); Z shows the atomic number (number of protons), N the number of neutrons of the isotopes

nuclide	Decay	HWZ	E / MeV	Decay product
239 Pu	α	24110 a	5.245	235 U
235 U	α	7.038 x 10 8 a	4,679	231 Th
231 Th	β - α 0.000001%	25.52 h	0.389 0.389	231 Pa 227 Ra
231 Pa	α	32760 a	5.149	227 Ac
227 ra	β -	42.2 min	1.325	227 Ac
227 Ac	β - 98.62% α 1.38%	21,773 a	0.045 5.042	227 Th 223 Fr
227 Th	α	18.72 d	6.146	223 ra
223 Fr	β - 99.994% α 0.006%	22.0 min	1.149 5.430	223 Ra 219 at
223 ra	α	11.435 d	5.979	219 para
219 at	α 97% β - 3%	56 s	6,390 1,700	215 Bi 219 Rn
219 para	α	3.96 s	6,946	215 Po
215 bi	β -	7.6 min	2.250	215 Po
215 Po	α β - 0.000023%	1.781 ms	7.526 0.721	211 Pb 215 at
215 at	α	0.10 ms	8.178	211 bi
211 Pb	β -	36.1 min	1.373	211 bi
211 bi	α 99.72% β - 0.28%	2.14 min	6.751 0.579	207 Tl 211 Po
211 Po	α	0.516 s	7,595	207 Pb
207 Tl	β -	4.77 min	1.423	207 Pb
207 Pb	.	stable	.	.