What is the maximum reading at the container for a radioactive placard with three vertical red lines?

The correct answer indicates that the maximum radiation reading at the container marked with three vertical red lines corresponds to a level of 200 mR/hour. In the context of radioactive materials, these placards are part of the labeling system established by the Department of Transportation (DOT) to provide critical information about the type of radioactive material and the levels of radiation associated with it.

The three vertical red lines specifically signify that the package is categorized as "Radioactive Yellow III," which is the highest hazard classification for radioactive materials. This classification allows for a maximum dose rate of up to 200 mR/hour at the surface of the package. Being aware of this information is crucial for emergency responders and technicians working in hazardous materials environments, as it helps ensure proper safety measures are implemented when dealing with radioactive substances. Understanding these placards and their implications is essential for effective communication and response during hazardous materials incidents.