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  • Determination of Phoswich detector response using MCNP analysis to enhance Radioxenon measurement

    Creator:
    Lopez, Alejandro Uriel
    Abstract:
    As mandated by the Comprehensive Nuclear Test Ban Treaty (CTBT), the United States (US) is involved in the development and deployment of an International Monitoring System (IMS) for monitoring nuclear explosions. The US system, developed at Pacific Northwest National Laboratory, is known as the Automated Radioxenon Sampler/Analyzer (ARSA). The US...
    Resource Type:
    Masters Thesis
    Full Text:
    xenon isotope is determined from the instant of detonation through each fission decay chain until

  • Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring

    Creator:
    Alemayehu, Bemnet
    Abstract:
    Radioxenon detection is a technique used to monitor nuclear explosion and verify the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Because of an ultra-low concentration of radioxenon at radioxenon monitoring stations, radioxenon detection systems must have high sensitivity. This sensitivity is measured in terms of detector's minimum detectable concentration (MDC). It is required...
    Resource Type:
    Dissertation
    Full Text:
    Real-time Radioxenon Measurement using a Compton-suppressed

  • A Two-element CZT-based Radioxenon Detection System for Nuclear Weapon Test Monitoring

    Creator:
    Ranjbar, Lily
    Abstract:
    Detection of xenon radioisotopes (radioxenons) has proven to be an important method for detecting nuclear explosions and is particularly well suited for detecting undeclared underground testing. The radioxenon isotopes ¹³¹mXe (t₁/₂ = 11.934 d), ¹³³mXe (t₁/₂ = 2.19 d), ¹³³Xe (t₁/₂ = 5.243 d) and ¹³⁵Xe (t₁/₂ = 9.14 h)...
    Resource Type:
    Dissertation
    Full Text:
    Detection of xenon radioisotopes (radioxenons) has proven to be an important method for detecting nuclear

  • An investigation of the light capture properties of the XEPHWICH, a phoswich radiation detection system

    Creator:
    Jones, Sean E.
    Abstract:
    The XEPHWICH system is a phoswich type (multiple scintillator) radiation detector designed to detect several radioxenon isotopes with the goal of identifying covert nuclear explosions. The XEPHWICH system is designed with the sole purpose of replacing the Automated Radio-xenon Sampler/Analyzer (ARSA) in the United Nation's (UN) Comprehensive Test Ban Treaty's...
    Resource Type:
    Masters Thesis
    Full Text:
    Radio-xenon Sampler/Analyzer (ARSA) in the United Nation’s (UN) Comprehensive Test Ban Treaty’s (CTBT

  • Capabilities of Detecting Medical Isotope Facilities through Radioxenon Sampling

    Creator:
    MacDougall, Matthew R.
    Abstract:
    Medical Isotopes are a necessity in modern medicine for cancer treatments and medical imaging. In order to ensure that the needs and demands are met for the medical procedures, facilities are put in place to produce these isotopes. There are over 25 different isotopes of interest being produced by more...
    Resource Type:
    Masters Thesis
    Full Text:
    Capabilities of Detecting Medical Isotope Facilities through

  • Radioxenon generation using highly enriched uranium

    Creator:
    Elliott, Anthony James
    Abstract:
    This work focuses on the generation and collection of four specific radioxenon isotopes; xenon-131m, xenon-133m, xenon-133 and xenon-135. These nuclides are created by fissioning a highly enriched uranium sample using a thermal neutron source from a university research reactor. The three main aspects of this work include: (1) Conducting preliminary...
    Resource Type:
    Masters Thesis
    Full Text:
    ....................................................................................... 22 3) Xenon isotope decay energies

  • A Compact Radioxenon Detection System Using CZT, an Array of SiPMs, and a Plastic Scintillator

    Creator:
    Czyz, Steven A.
    Abstract:
    Several radioxenon isotopes (¹³¹ᵐXe, ¹³³Xe, ¹³³ᵐXe, ¹³⁵Xe) are characteristic byproducts of nuclear explosions, and due to their chemically nonreactive nature can easily escape from tests occurring underground and enter the atmosphere. It has been shown that by utilizing beta-gamma coincidence techniques, the Comprehensive Nuclear Test Ban Treaty Organization (CTBTO) can...
    Resource Type:
    Masters Thesis
    Full Text:
    measurement and a Minimum Detectable Concentration (MDC) calculation for 135Xe 133Xe, and 133mXe. The system

  • Application of nitrogen stable isotopes to identify sources of nutrient pollution : a management tool?

    Creator:
    Redon, Elizabeth A.
    Abstract:
    Nutrient pollution may perhaps be one of the oldest water quality problems and has recently been considered as one of the greatest threats to estuarine and coastal waters. Excessive nutrient loads have had a vast array of impacts on estuarine and coastal ecosystems globally. Direct negative effects include: shading out...
    Resource Type:
    Masters Thesis
    Full Text:
    assess anthropogenic nitrogen contributions. Therefore, application of nitrogen stable isotope methods