Nonintrusive Inspection (NII) will be conducted within how many miles of a large-scale gamma ray or X-ray imaging system?

• A. 25 Miles
• B. 50 Miles
• C. 75 Miles
• D. 100 Miles

Answer: (B)

Nonintrusive Inspection hinges on following up imaging results with a timely, on-the-ground verification. The standard operating radius around a large-scale gamma ray or X-ray imaging system is 50 miles. This distance provides a practical balance: it’s close enough to respond quickly to imaging alerts and inspect targets, yet broad enough to cover multiple lanes or nearby routes without causing excessive delays. Distances that are smaller would limit coverage and reduce the ability to reach targets flagged by the imaging system, while much larger distances would stretch resources and slow down the verification process.