Which of the following DOT labels corresponds to a radiation level of 50-200 mR/hr at the surface?

The correct choice is associated with the classification of radiation levels as defined by the U.S. Department of Transportation (DOT) guidelines. The Radiation Symbol labels are used to indicate the level of radiation exposure, and each category has specific allowable exposure rates.

Radioactive II (Yellow) labels correspond to radiation levels that range from 0.5 to 50 mR/hr at the surface. Radioactive III (Yellow) labels, which is the answer provided, are meant for materials that produce radiation levels between 50 and 200 mR/hr at the surface. Thus, this label signifies a moderate radiation hazard that requires caution.

The other options, such as Radioactive I (White), are intended for materials with lower radiation levels, generally below 0.5 mR/hr, and do not indicate the increased level of exposure found with Radioactive II or III categories. Similarly, Radioactive IV (Red) is not applicable in this context, as it signifies very high radiation levels, typically exceeding the 200 mR/hr mark.

Understanding these classifications is vital for ensuring safety and compliance when working with radioactive materials and for transporting such materials in accordance with regulatory requirements.