ASNT Industrial Radiography Radiation Safety Practice Test

The correct choice highlights a critical safety concern regarding the transportation of radiation sources. When transporting radioactive sources, it is essential to ensure that they are never left unattended in a transport vehicle, especially if the alarm system is nonfunctional. A nonfunctioning alarm does not provide any security or warning in case of unauthorized access or tampering with the transport vehicle, significantly elevating the risk of accidents or misuse.

Proper transport protocols mandate that sources must always be secured and monitored to prevent unauthorized access. An unattended vehicle with a nonfunctioning alarm means that there is no way to alert personnel in the event of an incident, leaving the sources vulnerable.

In contrast, allowing sources to be left unattended with a functioning alarm can be considered more acceptable since the functioning alarm could alert personnel to potential interference, even though best practices would still advocate for constant supervision. Other answers involve elements that either compromise security or safety standards and would typically not meet regulatory guidelines for transporting hazardous materials.