Detection of nitrogenous material

US5247177A · kind A · utility

Assignee

• The State of Israel, Atomic Energy Commission, Soreq nuclear Research Center · IL

Inventors

• Mark Goldberg · Rehovot, IL
• David Vartsky · Yavne, IL
• Gideon Engler · Rehovot, IL
• Aharon Goldschmidt · Nes Ziona, IL

Key dates

• Filing date: Jul 6, 1992
• Grant date: Sep 21, 1993
• Expiry date: Jul 6, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05H6/00
• WIPO field: Measurement
• WIPO sector: Instruments

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.