Nitrogen detector and method of detecting

Details Nitrogen detector and method of detecting Nitrogen detector and method of detecting

1993-01-19

1994-01-25

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Absorption

378 57, G01N 2306

Patent

active

052822354

ABSTRACT:
An apparatus and method for determining the amount of nitrogen in an object. A support means is provided for supporting the object, and at least one gamma ray beam is disposed on one side of the support for producing a beam of about 9.2 MeV gamma rays and in sufficient intensity to cause measurable resonant absorption by .sup.14 N in the nitrogenous compounds. A directing device is disposed between the gamma ray beam and the support for directing the gamma ray beam to the support at a predetermined angle, such that the gamma ray beam forms a path which encounters at least a portion of the object when disposed on the support. An array of gamma ray detectors are disposed on an opposite side of the support for detecting gamma rays of about 9.2 MeV transmitted through the object at both resonant and non-resonant angles. A computation device computes the difference in the amount of transmitted gamma rays detected by the detectors at the resonant angles and non-resonant angles, and the difference is related to the amount of nitrogenous compounds in the object.

REFERENCES:
patent: 4941162 (1990-07-01), Vartsky et al.
patent: 5040200 (1991-08-01), Ettinger et al.
patent: 5115459 (1992-05-01), Bertozzi
patent: 5125015 (1992-06-01), Shimoni et al.
"Nuclear and X-Ray Technologies for Airport Security", Grodzins, MIT Symposium Apr. 17, 1990.

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