Which colors and symbols indicate the boundary of a radiological hazard?

The correct choice denotes the use of yellow and magenta rope, tape marks, or ribbon as indicators of the boundary of a radiological hazard. These specific colors are established industry standards designed to alert personnel to the presence of radiological risks. The combination of yellow and magenta serves to clearly convey that the area is restricted and to prompt caution among employees who may be entering or working nearby.

Yellow typically signifies caution, indicating a need for awareness of potential hazards, while magenta is often associated with radiation warnings. This combination effectively communicates the seriousness of the hazard, ensuring that individuals can easily recognize and respond to the potential risks involved.

In contrast, the other options do not align with the established color codes recognized for radiological safety. Red and yellow rope is used commonly in other types of hazards but does not specifically indicate radiological risk. Similarly, blue tape and signs are usually associated with marking non-radiological hazards, such as safety barricades, while black and white markings generally suggest different types of information, not specifically related to radiological hazards.