What is the key characteristic of non-critical instruments in radiology?

Non-critical instruments in radiology are specifically characterized by their lack of direct contact with mucous membranes. They are typically utilized for tasks that only involve contact with intact skin, which does not carry the same risk of transmitting infections as instruments that contact mucous membranes or penetrate soft tissues. This classification is crucial for determining the appropriate level of disinfection required; non-critical instruments usually undergo routine cleaning and low-level disinfection rather than sterilization, which is reserved for critical and semi-critical instruments. Understanding this distinction helps in implementing effective infection control measures and minimizing the risk of cross-contamination in dental practice.