Detection of nitrogenous material

Details Detection of nitrogenous material Detection of nitrogenous material

1992-07-06

1993-09-21

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

2503591, 2503601, 25039004, 25039006, 378 53, 378 57, 378143, 376194, 376195, G01N 2308, H05H 600

Patent

active

052471772

ABSTRACT:
Improved method and means for the detection of nitrogenous material or assaying of nitrogenous material in an object on the basis of nuclear resonant attenuation of 9.17 MeV .gamma.-rays. A target in form of one or several .sup.13 C pellets at least 25.mu. thick, or alternatively in form of a body that bears a composite thin film including at least one .sup.13 C layer not more than 1.mu. thick and at least one other substance that is capable of generating supplementary .gamma.-radiation for determining the non-resonant component of attenuation, is bombarded with 1.75 MeV protons to produce a source of 9.17 MeV .gamma.-rays. The target is placed on one side of the inspected object and a .gamma.-ray detector or an array of such detectors is placed on the other side and the total and non-resonant attenuation are read and evaluated.

REFERENCES:
patent: 4941162 (1990-07-01), Vartsky et al.
patent: 5040200 (1991-08-01), Ettinger et al.
Richard A. Ferrieri, David J. Schlyer, Bruce W. Wieland and Alfred P. Wolf, "On-line Production of .sup.13 N-Nitrogen Gas from a Solid Enriched .sup.13 C-Target and its Application to .sup.13 N-Ammonia Synthesis Using Microwave Radiation." Int. J. Appl. Radiat. Isot., vol. 34, No. 6, (1983), pp. 897-900.

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