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Title: Handheld isotope identification system

Abstract

A portable radiation detector using a high-purity germanium crystal as the sensing device. The crystal is fabricated such that it exhibits a length to width ratio greater than 1:1 and is oriented within the detector to receive radiation along the width of said crystal. The crystal is located within a container pressurized with ultra-pure nitrogen, and the container is located within a cryostat under vacuum.

Inventors:
 [1];  [2]; ;  [3];  [4]
  1. Los Alamos, NM
  2. Alameda, CA
  3. Pleasant Hill, CA
  4. Livermore, CA
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Sponsoring Org.:
USDOE
OSTI Identifier:
903330
Patent Number(s):
7,161,150
Application Number:
11/052,176
Assignee:
Los Alamos National Security, LLC (Los Alamos, NM) ALO
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Frankle, Christen M, Becker, John A, Cork,, Christopher, P, and Madden, Norman W. Handheld isotope identification system. United States: N. p., 2007. Web.
Frankle, Christen M, Becker, John A, Cork,, Christopher, P, & Madden, Norman W. Handheld isotope identification system. United States.
Frankle, Christen M, Becker, John A, Cork,, Christopher, P, and Madden, Norman W. Tue . "Handheld isotope identification system". United States. doi:. https://www.osti.gov/servlets/purl/903330.
@article{osti_903330,
title = {Handheld isotope identification system},
author = {Frankle, Christen M and Becker, John A and Cork, and Christopher, P and Madden, Norman W},
abstractNote = {A portable radiation detector using a high-purity germanium crystal as the sensing device. The crystal is fabricated such that it exhibits a length to width ratio greater than 1:1 and is oriented within the detector to receive radiation along the width of said crystal. The crystal is located within a container pressurized with ultra-pure nitrogen, and the container is located within a cryostat under vacuum.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 09 00:00:00 EST 2007},
month = {Tue Jan 09 00:00:00 EST 2007}
}

Patent:

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  • A portable radiation detector using a high-purity germanium crystal as the sensing device. The crystal is fabricated such that it exhibits a length to width ratio greater than 1:1 and is oriented within the detector to receive radiation along the width of said crystal. The crystal is located within a container pressurized with ultra-pure nitrogen, and the container is located within a cryostat under vacuum.
  • GammaTracker is a portable handheld radioisotope identifier using position sensitive CdZnTe crystals. The device uses a peak-based method for isotope identification implemented on an embedded computing platform within the device. This paper presents the run-time optimized algorithms used in this peak-based approach. Performance of the algorithms is presented using measured data from gamma-ray sources.
  • A dual isotope notch observer for isotope identification, assay and imaging with mono-energetic gamma-ray sources includes a detector arrangement consists of three detectors downstream from the object under observation. The latter detector, which operates as a beam monitor, is an integrating detector that monitors the total beam power arriving at its surface. The first detector and the middle detector each include an integrating detector surrounding a foil. The foils of these two detectors are made of the same atomic material, but each foil is a different isotope, e.g., the first foil may comprise U235 and second foil may comprise U238.more » The integrating detectors surrounding these pieces of foil measure the total power scattered from the foil and can be similar in composition to the final beam monitor. Non-resonant photons will, after calibration, scatter equally from both foils.« less
  • Proteolytic peptide mass mapping as measured by mass spectrometry provides an important method for the identification of proteins, which are usually identified by matching the measured and calculated m/z values of the proteolytic peptides. A unique identification is, however, heavily dependent upon the mass accuracy and sequence coverage of the fragment ions generated by peptide ionization. The present invention describes a method for increasing the specificity, accuracy and efficiency of the assignments of particular proteolytic peptides and consequent protein identification, by the incorporation of selected amino acid residue(s) enriched with stable isotope(s) into the protein sequence without the need formore » ultrahigh instrumental accuracy. Selected amino acid(s) are labeled with .sup.13C/.sup.15N/.sup.2H and incorporated into proteins in a sequence-specific manner during cell culturing. Each of these labeled amino acids carries a defined mass change encoded in its monoisotopic distribution pattern. Through their characteristic patterns, the peptides with mass tag(s) can then be readily distinguished from other peptides in mass spectra. The present method of identifying unique proteins can also be extended to protein complexes and will significantly increase data search specificity, efficiency and accuracy for protein identifications.« less
  • A system, suitable for use as an identity seal for an object, such as a container for fissile material, comprises a body including a cap for fitting over one end of the object, and a recess which contains a material such as ''araldite'' or aluminium acting as a matrix for a plurality of inclusions of E.G. Bronze embedded therein in a random configuration. The recess is closed by a cover which includes a central electrically conductive part. Also embedded in the matrix material and constituting further ''inclusions'' are two piezoelectric crystal transducers each electrically connected to the central cover part.more » In use, the transducers are electrically connected via the central cover part to external ultrasonic testing apparatus to provide a unique output indicative of the particular structure of the seal particularly the inclusion configuration and hence providing a unique ''identity'' and hence indication of integrity for the seal. Tampering with and/or removal of the seal will change its structure in some way so that subsequent ultrasonic testing produces a different output, revealing the occurrence of the unauthorized event.« less