X-ray checks, one image a day per machine.
Each working day, one image of the phantom on each x-ray machine. The first one is the machine’s baseline, and every check after it is measured against it. The HARP records for each x-ray room are kept beside them.

X-ray checks
What it does.
One phantom image a day
On each machine, every working day the clinic is open.
Against the baseline
Every check is measured against the machine’s first image.
HARP records
The approval letter, the floor plan and the HARP test for each x-ray room.
An exposure log
Images taken, kept with the test history.