A simple calculator to calculate decayed values for activities in either Becquerels or Curies.Advanced features include multiple reference dates, a database of Isotopes with their half life constants and a log file to easily record activities.(The paid version has facilities to save the log file and edit the isotope database. It also doesn’t have the ad banner.)Simply long-press the reference buttons to enter reference dates then enter an activity and use Ref1, Ref2 to show the activity decayed to that reference. Use the clock button to show the activity decayed to the current time.The internet and network status permissions are for the ad banner and are not present in the paid application.Please note that this Decay Calculator App is provided as is, without any guarantees or warranty. Although the author has tested the application and believes it to be bug free, the author is not liable for any damage or losses of any kind caused by the use or misuse of this application.