Importance

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Abstract

An analyzer for detecting explosives has at least one source and a plurality of gamma ray detectors. An article to be analyzed is moved adjacent the source and detectors and is subjected to neutrons which generate gamma rays in any nitrogen in the article. The gamma rays are detected and analyzed to determine the nitrogen concentration within the article. In order to achieve an area of uniform detection there are a plurality of detectors equidistant both from each source and from the article to be analyzed. In order to avoid a decrease in sensitivity away from the sources and detectors, there may be a second opposing array of sources and detectors on the opposite side of the articles. For greatest uniformity of detection, a source in one array opposes a detector in the other array and vice versa. Transmission of radiation from the analyzer is kept at safe levels by enclosing the analyzer within shielding which includes shield members extending from a trolley or other transport mechanisms.

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First Claim