Radioactive Decay Calculator

Calculate remaining or original activity using either elapsed time or start and target date/time. Supports forward and backward decay correction, unit conversions, and preloaded radionuclide half-lives.

Calculation Mode: Elapsed Time Start & Target Date/Time

Radionuclide: Custom Tc-99m (6 h) F-18 (109.8 min) I-123 (13.2 h) I-131 (8.02 d) Ga-67 (3.26 d) Ga-68 (67.7 min) Co-57 (271.8 d) Ge-68 (271 d) Lu-177 (6.65 d) Y-90 (64.1 h) In-111 (2.81 d) Xe-133 (5.25 d)

Half-life: Seconds Minutes Hours Days

Initial Activity: Bq kBq MBq GBq µCi mCi Ci

Elapsed Time: Seconds Minutes Hours Days

Start Date & Time:

Target Date & Time:

Output Unit: Bq kBq MBq GBq µCi mCi Ci

Remaining Activity:

Fraction Remaining:

Fraction Decayed:

Elapsed Time:

This tool is for educational purposes only.

Made by Poovendhan.