By Christopher Boucek and Richard Hubbell14 Nov 2007
In 2003 a plot was foiled to sell some 70 pounds of caesium-137 in Bangkok, Thailand. In light of this threat, it is essential that all containers entering the US should be screened for radioactivity to try to prevent the entry of uncontrolled radioactive materials that may later be used to construct either a nuclear device or a 'dirty bomb'. This article explores the means available for screening.
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