New physics files and changes to existing physics files in PS6 must be authenticated by a responsible user (e.g. a medical physicist).
Every time a physics file is loaded a checksum is calculated and compared to the authenticated checksum recorded in PSdatabase.sqlite for that file. If the checksums do not match the file is flagged and cannot be used for dose calculations until it has been authenticated.
Physics files should be initially authenticated the first time PS6 is run following the initial installation of the software by unlocking physics access (using the physics password) and clicking Delete All Checksums followed by the Authenticate All Files button near the lower right corner.
To authenticate a single file click the Authenticate button next to the source menu.
You can add a table of manufacturer's standard activity batches in this panel.
You can add a comment to the physics file in this panel.
Any errors detected when loading a physics file are listed in this panel.
If the physics file for the radionuclide source you want to use is not enabled in the inventory window or elsewhere in PS6 (probably because it is not an IsoAid product) you will need to enable all sources in the basic preferences pane.