This is a Phase III deliverable from the Limitations Working Group and Technology Track.
Portal monitoring is an arms control verification mechanism that can assist in verification of treaty accountable items (TAIs). Portal monitor technology spans a wide range of sensors, including radiation detectors, break beams, or weight sensors. Radiation-detecting portal monitors are able to confirm absence/presence of a radiological signature and to track direction of motion of items of interest. Portal monitoring uses measurements from strategically placed sensors (e.g., radiation detectors) to record the entry or egress of TAIs. The implementation of portal monitoring relies on three key elements: perimeter definition, portal location (singular or multiple), and sensor technology. It can be implemented in either time-bound or continuous operations depending on what is allowed under the terms of a given agreement.
