Radioactive Decay Calculator

Radioactive
Decay/Activity
Calculators



Select an Isotope
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Isotope       Half-life      Days/
                                 Months/
                                 Years


Radioactive Decay


A=Aoe-(0.693t/T1/2)

Initial activity (Ao)
Decay time (t)
Time units      h d y
Final activity (A)
Timed Decay

t = -(T1/2/0.693) * ln(A/Ao)
Initial activity (Ao)
Final activity (A)
Decay time (t)

Unit Converter
Find the difference between
two dates.
Add or subtract a number
of days to a date.
Activity 1
kBqMBquCimCi
Activity 2
kBqMBquCimCi

Date 1
Date 2
Days
Date 1
Days
Date 2