Method and apparatus for detecting concealed substances
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United States of America Patent
Stats
-
Dec 26, 1995
Grant Date -
N/A
app pub date -
Oct 11, 1994
filing date -
Apr 9, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus detects the presence of a number of substances such as explosives or drugs in a container such as luggage (10) at an airport. The containers, travelling on a conveyor (15) for example are irradiated with fast neutron and gamma source radiation (6) preferably simultaneously and preferably of different frequencies. The radiation is detected (7) and the extent to which each species of the source of radiation is transmitted through the container is measured. The measurements are analyzed with reference to the known characteristic attenuation coefficients and density properties of those substances for each species of the source radiation.
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