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US5247177A
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Detection of nitrogenous material
Assignee: STATE OF ISRAEL ATOMIC ENERGY COMMISSIION SOREQ NUCLEAR RESEARCH CENTER
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Filing: 1992-07-06
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Granted: 1993-09-21
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Expires: 2012-07-06
Abstract
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 γ-rays. A target in form of one or several 13 C pellets at least 25μ thick, or alternatively in form of a body that bears a composite thin film including at least one 13 C layer not more than 1μ thick and at least one other substance that is capable of generating supplementary γ-radiation for determining the non-resonant component of attenuation, is bombarded with 1.75 MeV protons to produce a source of 9.17 MeV γ-rays. The target is placed on one side of the inspected object and a γ-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.
Inventors
- 👤 Mark Goldberg
- 👤 David Vartsky
- 👤 Gideon Engler
- 👤 Aharon Goldschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/20; G01V5/22; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/095; H; H05; H05H; H05H6/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
185 words
A method for the detection of nitrogenous materials or assaying of nitrogenous concentrations within an object, comprising: (i) placing on one side of the object a target containing 13 C for bombardment with 1.75 MeV protons to produce a source of 9.17 MeV γ-rays; (ii) placing on the opposite side of the object a γ-ray detector or array of detectors with a nitrogen rich detection medium; (iii) scanning the object with γ-ray beam from said source; (iv) reading from said γ-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; characterized in that the said target is a member of the group consisting of 13 C pellets at least 25μ thick and bodies bearing at least one composite thin film being not more than 1μ thick and including at least one 13 C layer and at least one other layer, said at least one other layer containing a substance that is capable of generating supplementary γ-radiation for determining the non-resonant component of attenuation.
Claim 2
Independent Claim
185 words
A method for the detection of nitrogenous materials or assaying of nitrogenous concentrations within an object, comprising: (i) placing on one side of the object a target containing 13 C for bombardment with 1.75 MeV protons to produce a source of 9.17 MeV γ-rays; (ii) placing on the opposite side of the object a γ-ray detector or array of detectors with a nitrogen rich detection medium; (iii) scanning the object with γ-ray beam from said source; (iv) reading from said γ-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; characterized in that the said target is a member of the group consisting of 13 C pellets at least 25μ thick and bodies bearing at least one composite thin film being not more than 1μ thick and including at least one 13 C layer and at least one other layer, said at least one other layer containing a substance that is capable of generating supplementary γ-radiation for determining the non-resonant component of attenuation.
Claim 3
Dependent Claim
42 words
A method according to claim 1, wherein the target consists of 13 C pellets as defined in claim 1 and said 13 C pellets in said target comprise an additional substance capable of generating γ-radiation for determining the non-resonant component of attenuation.
Claim 4
Dependent Claim
13 words
A method according to claim 2, wherein said additional substance is a fluoride.
Claim 5
Dependent Claim
15 words
A method according to claim 3, wherein said fluoride is calcium fluoride or barium fluoride.
Claim 6
Dependent Claim
39 words
A method according to claim 1, wherein the target consists of a body bearing at least one composite thin film as defined in claim 1 and the substance in the said at least one other layer is a fluoride.
Claim 7
Dependent Claim
15 words
A method according to claim 5, wherein said fluoride is calcium fluoride or barium fluoride.
Claim 8
Dependent Claim
36 words
13 C pellets which are at least 25μ thick for use as targets for bombardment with 1.75 MeV protons for the generation of 9.17 MeV γ-rays and supplementary radiation for determining the non-resonant component of attenuation.
Claim 9
Dependent Claim
36 words
13 C pellets which are at least 25μ thick for use as targets for bombardment with 1.75 MeV protons for the generation of 9.17 MeV γ-rays and supplementary radiation for determining the non-resonant component of attenuation.
Claim 10
Dependent Claim
22 words
13 C pellets according to claim 7, comprising an additional substance capable of generating γ-radiation for determining the non-resonant component of attenuation.
Claim 11
Dependent Claim
14 words
13 C pellets according to claim 8, wherein said additional substance is a fluoride.
Claim 12
Dependent Claim
16 words
13 C pellets according to claim 9, wherein said fluoride is calcium fluoride or barium fluoride.
Claim 13
Dependent Claim
57 words
A target for bombardment with 1.75 MeV protons for the generation of 9.17 MeV γ-rays, comprising a body bearing a composite thin film not more than 1μ thick and including at least one 13 C layer and at least one other layer containing a substance capable of generating supplementary radiation for determining the non-resonant component of attenuation.
Claim 14
Dependent Claim
57 words
A target for bombardment with 1.75 MeV protons for the generation of 9.17 MeV γ-rays, comprising a body bearing a composite thin film not more than 1μ thick and including at least one 13 C layer and at least one other layer containing a substance capable of generating supplementary radiation for determining the non-resonant component of attenuation.
Claim 15
Dependent Claim
19 words
A body according to claim 11, wherein the substance in said at least one other layer is a fluoride.
Claim 16
Dependent Claim
15 words
A body according to claim 12, wherein said fluoride is calcium fluoride or barium fluoride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |