Which procedure is used to maintain quality control in radiation therapy equipment?

Linearity testing is essential in maintaining quality control for radiation therapy equipment because it ensures that the relationship between the output of the radiation source and the administered dose is consistent across a range of output levels. This procedure helps in verifying that the dose delivered during treatment is accurate and reproducible, which is crucial for patient safety and treatment efficacy.

Moreover, linearity testing guarantees that the equipment is functioning properly and that it adheres to regulatory standards. Any deviation in dose output can be critical in radiation therapy, as it directly affects treatment outcomes. Thus, by performing regular linearity assessments, healthcare providers can ensure that the equipment delivers the intended dose reliably, which is a cornerstone of effective radiation therapy delivery.

The other options, while related to radiation safety or quality assurance, do not directly address the specific assessment of dose consistency critical in radiation therapy equipment.