How many levels of probability are used to categorize the risk of a chemical, biological, and radiological threat?

The categorization of risk for chemical, biological, and radiological threats typically utilizes four distinct levels of probability. This framework allows for a systematic assessment of the likelihood of various threats, facilitating proper risk management and resource allocation. Each level corresponds to specific criteria that determine the potential impact and necessity for response measures, thereby ensuring preparedness against varying degrees of threats.

Understanding these levels is crucial in contexts such as emergency management and military operations, where distinguishing between degrees of risk directly affects planning and operational readiness. The use of four levels provides a comprehensive approach that helps decision-makers prioritize actions based on the severity and likelihood of different threat scenarios. Thus, the answer indicating four levels is the accurate reflection of established protocols in risk assessment for such threats.