Radiogenic nuclide
Radiogenic nuclides used in geology
The following table lists some of the most important radiogenic isotope systems used in geology, in order of decreasing half-life of the radioactive parent isotope.

Radiogenic nuclide

Section Title: Radiogenic nuclides used in geology
Table Section Text: The following table lists some of the most important radiogenic isotope systems used in geology, in order of decreasing half-life of the radioactive parent isotope.

Parent nuclide	Daughter nuclide	Decay constant (yr−1)	Half-life

190Pt	186Os	1.477 ×10−12	469.3 Gyr *

147Sm	143Nd	6.54 ×10−12	106 Gyr

87Rb	87Sr	1.402 ×10−11	49.44 Gyr

187Re	187Os	1.666 ×10−11	41.6 Gyr

176Lu	176Hf	1.867 ×10−11	37.1 Gyr

232Th	208Pb**	4.9475 ×10−11	14.01 Gyr

40K	40Ar	5.81 ×10−11	11.93 Gyr

238U	206Pb**	1.55125 ×10−10	4.468 Gyr

40K	40Ca	4.962 ×10−10	1.397 Gyr

235U	207Pb**	9.8485 ×10−10	0.7038 Gyr

129I	129Xe	4.3 ×10−8	16 Myr

10Be	10B	4.6 ×10−7	1.5 Myr

26Al	26Mg	9.9 ×10−7	0.7 Myr

36Cl	36Ar/S	2.24 ×10−6	310 kyr

234U	230Th	2.826 ×10−6	245.25 kyr

230Th	226Ra	9.1577 ×10−6	75.69 kyr

231Pa	227Ac	2.116 ×10−5	32.76 kyr

14C	14N	1.2097 ×10−4	5730 yr

226Ra	222Rn	4.33 ×10−4	1600 yr

Sentence(s)

The ²⁰⁶Pb is formed from ²³⁸U, ²⁰⁷Pb from ²³⁵U and ²⁰⁸Pb from ²³²Th.

final_sentence: The ²⁰⁶Pb is formed from ²³⁸U, ²⁰⁷Pb from ²³⁵U and ²⁰⁸Pb from ²³²Th.