Radioactivity Decay Calculators

Assay, residual and injection times


(min)







Current activity

Given time and initial activity, displays activity at current day and time




Decay after time

Starting from an initial activity, calculate the remaining radioactivity after a chosen delay (to find the activity at an earlier time, just use negative delay).


(min)








Equivalent Frame Time

Calculate frame time needed for a count equivalent scan delayed with respect to an original scan










Count eq scan time: (min)
Count eq scan time: (s)