Safety Office
Text only
Radioactive
Decay/Activity
Calculators


Select an Isotope
or imput your own

     
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 kBq MBq uCi mCi
Activity 2
kBq MBq uCi mCi

Date 1
Date 2
Days
Date 1
Days
Date 2


Last Updated: Friday, 12-Feb-2010
Published by University Police and Safety Office
Division of Finance and Administration
North Dakota State University
University Police and Safety Office
North Dakota State University
Campus Police: NDSU Dept 3001 - PO Box 6050 - Fargo, ND 58108-6050
Phone: (701) 231-8998 - Fax: (701) 231-6334
Safety Office: NDSU Dept 3300 - PO Box 6050 - Fargo, ND 58108-6050
Phone: (701) 231-7759 - Fax: (701) 231-6739