What is the written information about the controlled area at each x-ray machine referred to by dental personnel?

The correct answer is "Local rules," as this term specifically refers to the written information regarding the controlled area at each x-ray machine within a dental practice. Local rules are essential because they outline the safety measures, procedures, and conditions that must be followed to protect staff and patients from unnecessary exposure to radiation during dental x-ray procedures. These rules are integral to ensuring compliance with radiological protection standards in a clinic.

Local rules are typically developed in accordance with regulatory requirements and reflect the specific practices and equipment in use at the facility. They contribute to maintaining a safe work environment by informing staff about access restrictions, personal protective equipment (PPE) requirements, and emergency procedures that are specific to the x-ray machines.

Other options, while related to radiological safety, do not specifically pertain to the written information about controlled areas. For instance, IR(ME)R 2000 sets out legal requirements for radiation protection regarding medical exposure, including x-rays, but does not refer specifically to local written instructions. Similarly, IRR99 deals with workplace safety regulations governing the use of ionizing radiation but is more focused on general radiation safety and protection principles, rather than specific controlled area protocols. The quality assurance programme pertains to systematic procedures to ensure the quality and safety