Skip to content
Sci
Fun
Lab
Explore. Discover. Learn.
Home
Explore
Learn
Community
Videos
Toggle menu
Donate
Toggle theme
← Games
☢ Nuclear Decay
Atomic & Particles
Element
C-14 — 5,730 yr
I-131 — 8 days
Ra-226 — 1,600 yr
U-238 — 4.5 Byr
Tc-99m — 6 hr
Atoms
50
100
200
500
Speed
0.5×
1×
2×
5×
10×
▶ Start
↺ Reset
Atom Grid — 100/100 active
Live Readouts
Time elapsed
0.00 T½
Atoms remaining
100
% remaining
100.0%
Activity
0/s
Mean lifetime τ
0.00 T½
Half-life (real)
1s → 1 T½
Decay Curve
0
1
2
3
4
5
6
half-lives
0%
25%
50%
75%
100%
theoretical
simulated