ArArCALCsoftware for 40Ar/39Ar age calculations ?
ArArCALC is a Microsoft Excel 97-2000-XP application for performing calculations in 40Ar/39Ar geochronology. It is coded in Visual Basic for Applications and can be used under the Windows 95/98/NT/2000/ME/XP operating systems. ArArCALC provides an easy-to-use graphical interface for the calculation of age plateaus, total fusion ages and isochrons following the regression of 40Ar/39Ar mass spectrometry data. Results are stored in single Excel workbooks including nine different data tables and four different diagrams. Analytical, internal and external errors are calculated based on error propagation of all input parameters, analytical data and applied corrections. Finally, the age calculation results can be recalibrated with reference to the primary KAr standards (e.g. GA-1550, MMhb-1) in order to obtain more consistent absolute40Ar/39Ar age determinations. ArArCALC is distributed as freeware.
geochronology error propagation radiometric age absolute error data reduction