Regarding radiological hazards, which observation is not valid?

The observation stating that the Environmental Protection Agency (EPA) handles nuclear weapon accidents is not valid. Generally, the management of incidents involving nuclear weapons falls under the jurisdiction of specialized federal agencies such as the Department of Energy (DOE) and the Department of Defense (DoD), which have specific protocols and resources for responding to such scenarios. The EPA's focus is primarily on environmental oversight, pollution control, and public health issues related to radiation and hazardous materials, rather than direct involvement in nuclear weapon incidents.

In contrast, the other observations accurately reflect the realities of radiological hazards. Requests for federal assistance highlight the collaborative nature of emergency response, especially when local resources are overwhelmed. Accidents in facilities using radioactive materials are a known risk due to the inherent dangers associated with such materials, necessitating careful safety protocols. Additionally, federal agencies indeed possess specialized capabilities to respond to various radiological emergencies, further ensuring public safety and effective management of nuclear incidents.