Detection of concealed materials
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United States of America Patent
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Jan 15, 1985
Grant Date -
N/A
app pub date -
Jul 15, 1980
filing date -
Jul 30, 1979
priority date (Note) -
Expired
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Abstract
A hand portable probe 11 contains a radioactive source capsule 16 of low energy .gamma. rays which penetrate into an object against which the probe is positioned. Backscattered .gamma. radiation is detected by an annular radiation detector array 14 positioned to be in contact with or very close to the surface under examination. Materials of low atomic number exhibit low photoelectric absorption and can be detected even when concealed behind steel.
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