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    No, Brian, the radiological scanners in question have been installed in the last year or so. These will be passive devices with the radioactive substance generating the radiation field to be detected.

    You are probably thinking of the gamma ray scanners which have been in use for several years for detecting illegal immigrants hiding in lorries. These use a mobile framework which passes along the exterior of the lorry and transmit low level X-rays from one side which are received on the other side to give an indication of the contents.

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