This report provides a detailed technology-based review, as well as an application-based analysis of currently available nuclear/radiological detection portals. The report covers dozens of products, from pedestrian screening portals, vehicle and train systems, to crane-mounted detectors, manufactured by more than 15 vendors from all over the world. The information is designed to enable anti-terror professionals to make informed decisions about procurement, maintenance and investment on the basis of unbiased, comprehensive technical data, product comparison and cost analysis.