US 4,941,162 A · Method and system for detection of nitrogenous explosives by using nuclear resonance absorption

Abstract

A method for the detection of a nitrogenous explosive material in an object is provided which makes use of nuclear resonance absorption. The object to be tested is placed between a 9.17 MeV .gamma.-rays source and an .gamma.-rays detector holding a nitrogen medium. The total and the non-resonant attenuation of the .gamma.-rays flux is read by the detector and fed into a recorder. From the measured attenuation the net non-resonant attenuation is calculated and the amount of a nitrogenous explosive present in the object is determined therefrom. Also provided by the invention is a system for detecting a nitrogenous explosive in an object.

Claims8

Dependent claims

A method for the detection of a nitrogenous explosive material in an object, comprising:

(i) placing on one side of the object a source for 9.17 MeV .gamma.-rays adapted to produce a desired photon flux (emitted photon flux);
(ii) placing on the opposite side of the object a .gamma.-ray detector or array of detectors with a nitrogen rich detection medium;
(iii) scanning the object with a .gamma.-ray beam from said source;
(iv) reading from said .gamma.-ray detector or array of detectors the total and the non-resonant attenuations of the incident photon flux;
and
(v) deriving from said attenuations the net resonant attenuation and the spatial distribution thereof.

3 more elements

Dependencies are inferred from the claim text.

Method and system for detection of nitrogenous explosives by using nuclear resonance absorption

Life of this patent

Method and system for detection of nitrogenous explosives by using nuclear resonance absorption

Life of this patent

Abstract

Claims8