Which of the following is an example of an accident?

The selection of a Bradley fighting vehicle crushing an M8A1 chemical agent alarm as an example of an accident highlights the unintentional nature of the event. In this context, an accident is defined as an unforeseen incident that results in damage or harm, typically occurring without prior intention or planning. The action of the vehicle crushing the alarm fits this definition, illustrating how operational conditions can lead to unintended consequences.

Other choices represent different scenarios that don't align with the strict definition of an accident. Losing a dosimeter is generally considered a loss or oversight rather than an accident since it does not involve damage or harm occurring as a result of an unforeseen event. A radiological spill during transport indicates a hazardous incident but is classified typically under safety or regulatory concerns rather than an “accident” in the conventional sense of the term. Unauthorized access to a radioactive storage area suggests a security breach or policy violation, which again does not represent an accident per se but rather an intentional or negligent action that could lead to unsafe conditions.