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Class 7 of DOT Hazard Classifications specifically pertains to radioactive materials. This classification is essential for ensuring safety during the transportation of substances that emit ionizing radiation, which can pose significant health risks to people and the environment. Radioactive materials require specialized packaging, labeling, and handling procedures to mitigate these risks and adhere to federal regulations.

Each class within the DOT Hazard Classifications addresses different types of hazards. For instance, chemicals that can cause burns would likely fall under a different class related to corrosive materials, while gases under pressure are categorized separately due to their potential risks associated with pressure and gas release. Explosive materials represent another distinct hazard class focusing on substances that can detonate or combust. Therefore, the unique properties of radioactive materials warrant their classification as Class 7, ensuring that they are managed appropriately during transport.