A report by the National Research Council (NRC) found that Advanced Spectroscopic Portal (ASP) radiation detectors cannot distinguish between harmful sources of radiation and harmless sources including cat litter and bananas. The NRC report supports a finding by Department of Homeland Security Secretary Janet Napolitano that ASP’s do not perform well enough to replace polyvinyl toluene (PVT) detectors currently used in the nation’s ports.
Source: Physics Today
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