Analyze TACs with this tool. dftcat help you catenate the TACs from the second DFT file to the first one, or to a new datafile. Sample times or correction for physical decay is not changed.
Here is an example to use this program: dftcat t455ap_pump.kbq t455ap_manual.kbq t455ap_combined.kbq. This utility is command prompt based, so dont expect any fancy GUI to help you with the whole process.

Usage: dftcat <file1> <file2> [catenated file]

Options:
-both | -first | -second
In case of overlapping samples, either samples from both (-both), first (-first), or second (-second, default) TAC are saved in combined file.
-h or --help
Print this message and exit
--version or --build
Print software build information and exit
--silent
Program works silently, printing only error and warning messages
--verbose
Program prints more information about what it is doing.

The license of this software is Freeware, you can free download and free use this calculator software.