A watch-radiation dectector attracts mirth on gizmodo, and perhaps justifiably so.
However considering the difficulty that various authorities are having installing industrial scale radiation detectors in airports and ports, perhaps issuing a portable detector to all staff could a cheaper alternative.
It also changes the security paradigm from relying on technology run by barely trained people back to relying on people empowered with basic technology.
From personal experience the borders that find out the most about me are the ones staffed by curious, well educated and well paid people and who are armed with basics such as a computer system that logs all of my entries and exits from the country. The USA is not one of these countries.
Lance Wiggs 