Radioactive Isotope Explorer & Half-Life Calculator

Click any element in the periodic table or choose a category to view detailed decay data, including half-life, decay milestones, and common uses.

H
1 		He
2
Li
3 		Be
4 		B
5 		C
6 		N
7 		O
8 		F
9 		Ne
10
Na
11 		Mg
12 		Al
13 		Si
14 		P
15 		S
16 		Cl
17 		Ar
18
K
19 		Ca
20 		Sc
21 		Ti
22 		V
23 		Cr
24 		Mn
25 		Fe
26 		Co
27 		Ni
28 		Cu
29 		Zn
30 		Ga
31 		Ge
32 		As
33 		Se
34 		Br
35 		Kr
36
Rb
37 		Sr
38 		Y
39 		Zr
40 		Nb
41 		Mo
42 		Tc
43 		Ru
44 		Rh
45 		Pd
46 		Ag
47 		Cd
48 		In
49 		Sn
50 		Sb
51 		Te
52 		I
53 		Xe
54
Cs
55 		Ba
56 		Tl
81 		Pb
82 		Bi
83 		Po
84 		At
85 		Rn
86
Fr
87 		Ra
88 		Rf
104 		Db
105 		Sg
106 		Bh
107 		Hs
108 		Mt
109 		Ds
110 		Rg
111 		Cn
112 		Nh
113 		Fl
114 		Mc
115 		Lv
116 		Ts
117 		Og
118

Lanthanides

La
57		 Ce
58		 Pr
59		 Nd
60		 Pm
61		 Sm
62		 Eu
63		 Gd
64		 Tb
65		 Dy
66		 Ho
67		 Er
68		 Tm
69		 Yb
70		 Lu
71

Actinides

Ac
89		 Th
90		 Pa
91		 U
92		 Np
93		 Pu
94		 Am
95		 Cm
96		 Bk
97		 Cf
98		 Es
99		 Fm
100		 Md
101		 No
102		 Lr
103

Light-element isotopes

IsotopeHalf-life
Carbon-14 (C-14)5730 years
Tritium (H-3)12 years

Biological tracers & medical isotopes

IsotopeHalf-life
Phosphorus-32 (P-32)14.3 days
Sulfur-35 (S-35)87 days
Technetium-99m (Tc-99m)6 hours
Iodine-131 (I-131)8 days

Environmental & geological isotopes

IsotopeHalf-life
Potassium-40 (K-40)1,250,000,000.0 years
Uranium-238 (U-238)4,468,000,000.0 years
Uranium-235 (U-235)704,000,000.0 years
Thorium-232 (Th-232)14,050,000,000.0 years

Industrial & power applications

IsotopeHalf-life
Cesium-137 (Cs-137)30 years
Cobalt-60 (Co-60)5 years
Plutonium-239 (Pu-239)24100 years