Notes on monthly tests

MK1	Verification that the unit and accessories are firmly anchored and may be used without endangering patients or staff
MK2	Verification of the integrity of the filters and cones and cone indicators
MK3	Verification of the optical and/or mechanical distance indicator if the unit is equipped with one
MK4	Verification of the angle readouts
MK5	Performance parameters refer to agreement at each edge. This test does not apply to all machine designs
MK6	Geometric test to verify the light field sizes (where applicable)
MK7	Confirmation of radiation field size when a variable collimation system is provided. At least two field sizes must be checked
MK8	Using a film, the flatness and symmetry of the X ray beam must be assessed for the largest cone
MK9	Quantitative dosimetric test: output reproducibility test at all energies with varying head tilt and rotation27
MK10	If the unit is equipped with a timer, its accuracy must be checked against a stop watch over a range of doses of 10−1000 cGy
MK11	Should be checked for all beam qualities for MU‐based systems
MK12	Documentation relating to the daily quality control checks, preventive maintenance, service calls and subsequent checks must be complete, legible, and the operator identified