What maximum reading at the container indicates a significant radiation hazard for transport?

In the context of hazardous materials, particularly regarding radioactive substances, the maximum reading at a container that indicates a significant radiation hazard during transport is critical for ensuring safety. A reading of 200 mR/hour is officially recognized as a threshold that requires caution and could necessitate special handling or containment procedures.

This level of radiation is significant enough to warrant immediate attention due to the potential health risks associated with exposure. Assessing the radiation level at a container helps responders understand the associated risks and take appropriate measures to protect both themselves and the public.

The choices provided reflect increasing levels of radiation exposure. While readings above 200 mR/hour indicate heightened risks, the choice of 200 mR/hour is particularly notable in regulatory guidelines and safety information provided for hazardous materials transport, making it the correct response in this scenario.