Constants SI Units SI Prefixes Binary Prefixes Symbols Formulae Radioactivity Greek Letters EM Spectrum Laws/Thoeries

Note 1

Isotopes of elements are normally identified using this notation This example considers the isotope of Hydrogen, H is the chemical symbol for Hydrogen, 1 is the atomic number (number of protons) and 2 is the atomic mass (protons + neutrons). Unfortunately, the limitations of some web browsers make it impracticable for me to follow the normal notation within this page. For this reason I will be using the ammended notation of ²₁H

Note 2

These series are the ones regularly quoted in text books, however, there are many other short series (often only involving a single decay before becoming stable,) there could be additional long series and it is possible to extend these series to encompass many of the synthetic elements generated artificially.
 

Thorium Series

Element	Decay	Half Life
25298Cf	Alpha 42α	2.6 years
24896Cm	Alpha 42α	3.4 x105 years
24494Pu	Alpha 42α	8.0 x107 years
24092U	Beta  0-1β	14.1 hours
24093Np	Beta  0-1β	1.0 Hours
24094Pu	Alpha 42α	6.5 x103 years
23692U	Alpha 42α	2.3 x107 years
23290Th	Alpha 42α	1.4 x1010 Years
22888Ra	Beta  0-1β	6.7 Years
22889Ac	Beta  0-1β	6.1 Hours
22890Th	Alpha 42α	1.9 Years
22488Ra	Alpha 42α	3.6 Days
22086Rn	Alpha 42α	55 Seconds
21684Po	Alpha 42α	3.0 x10-7 Seconds
22282Pb	Beta  0-1β	10.6 Hours
21283Bi	Alpha 42α Beta  0-1β	3.0 x10-7 Seconds
If decay of 21283Bi is α
20881Tl	Beta  0-1β	3.1 Minutes
20882Pb		Stable
If decay of 21283Bi is β
21284Po	Alpha 42α	25 Seconds
20882Pb		Stable

Uranium Series (Radium Series)

Element	Decay	Half Life
23892U	Alpha 42α	4.5 x109 Years
23490Th	Beta  0-1β	2.4 Days
23491Pa	Beta  0-1β	6.7 Hours
23492U	Alpha 42α	2.4 x105 Years
23090Th	Alpha 42α	8 x104 Years
22688Ra	Alpha 42α	1.6 x103 Years
22286Rn	Alpha 42α	3.8 Days
21884Po	Alpha 42α	3.1 Minutes
21482Pb	Beta  0-1β	27 Minutes
21483Bi	Alpha 42α Beta  0-1β	20 Minutes
If decay of 21483Bi is α
21081Tl	Beta  0-1β	1.8 Minutes
21082Pb	Beta  0-1β	20 Years
21083Bi	Alpha 42α	5 Days
20681Tl	Beta  0-1β	24.2 Minutes
20682Pb		Stable
If decay of 21483Bi is β
21484Po	Alpha 42α	1.6 x10-4 Seconds
21082Pb	Beta  0-1β	20 Years
21083Bi	Alpha 42α	5 Days
20681Tl	Beta  0-1β	24.2 Minutes
20682Pb		Stable

Actinium Series

Element	Decay	Half Life
23994Pu	Alpha 42α	2.4 x104 Years
23592U	Alpha 42α	7.1 x108 Years
23190Th	Beta  0-1β	26 Hours
23191Pa	Alpha 42α	3.2 x104 Years
22789Ac	Beta  0-1β	22 Years
22790Th	Alpha 42α	18 Days
22388Ra	Alpha 42α	11 Days
21986Th	Alpha 42α	4 Seconds
22584Po	Alpha 42α	1.8 x10-3 Seconds
21182Pb	Beta  0-1β	36 Minutes
21183Bi	Alpha 42α	2.2 Minutes
20781Tl	Beta  0-1β	4.8 Minutes
20782Pb		Stable

Neptunium Series

Element	Decay	Half Life
24998Cf	Alpha 42α	351 years
24596Cm	Alpha 42α	8.5 x103 years
24194Pu	Beta  0-1β	14.4 years
24195Am	Alpha 42α	432 years
23793Np	Alpha 42α	2.1x 106 years
23391Pa	Beta  0-1β	27 days
23392U	Alpha 42α	1.6x 105 years
22990Th	Alpha 42α	7.3 x103 years
22588Ra	Beta  0-1β	14.9 days
22589Ac	Alpha 42α	10 days
22187Fr	Alpha 42α	4.8 minutes
21785At	Alpha 42α	32x 10-3 seconds
21383Bi	Alpha 42α Beta  0-1β	46.5 minutes
If decay of 21383Bi is α
20981Tl	Beta  0-1β	2.2 min
20982Pb	Beta  0-1β	3.2 hours
20983Bi	Alpha 42α	1.9x 1019 years
20581Tl		stable
If decay of 21383Bi is β
21384Po	Alpha 42α	3.7x 10-6 seconds
20982Pb	Beta  0-1β	2.2 min
20983Bi	Alpha 42α	1.9x 1019 years
20581Tl		stable