Radioactive Decay Calculator

Calculate remaining activity and decay fraction for any elapsed time.

Half-life: Seconds Minutes Hours Days

Initial Activity: Bq kBq MBq GBq µCi mCi Ci

Elapsed Time: Seconds Minutes Hours Days

Output Unit: Bq kBq MBq GBq µCi mCi Ci

Remaining Activity:

Fraction Remaining:

Fraction Decayed:

This tool is for educational purposes only.

Made by Poovendhan.

Reference: Common Radionuclides in Nuclear Medicine

Radionuclide	Half-life	Radionuclide	Half-life
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