⚗ Aliquot
Isotope decay
Remaining radioactivity after elapsed time, set by the isotope half-life.
Remaining activity
| A | Remaining activity | same unit as A0 |
| A_0 | Starting activity | arbitrary (Bq, Ci, cpm) |
| t | Time elapsed | same unit as half-life |
| t_{1/2} | Half-life | same unit as time |
32P, one half-life
After this time, 50 remains (50% of the start).
docs/v3
Remaining fraction
| \phi | Remaining fraction | dimensionless |
| t | Time elapsed | same unit as half-life |
| t_{1/2} | Half-life | same unit as time |
docs/v3