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Filtering by: Creator Hamby, Kelly A. Remove constraint Creator: Hamby, Kelly A. Contributor advisor sim Hamby, David M. Remove constraint Contributor advisor sim: Hamby, David M.

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  • Prototyping a triple-layer phoswich detection system

    Creator:
    Duncan, Christopher L.
    Abstract:
    Multi-layer optically coupled scintillation based radiation detectors, known as phoswich detectors, have rapidly evolved in recent years. During the same time, digital signal processing has improved radiation discrimination accuracy and enhanced reliability, while reducing complexity and size of traditional analog signal processing methods. A new generation of high-speed radiation detectors...
    Resource Type:
    Masters Thesis
    Full Text:
    8, 2011. Title: Prototyping a Triple-Layer Phoswich Detection System Abstract approved

  • Progress in the development of a portable phoswich-style skin contamination dosimeter

    Creator:
    Tang, Matthew M.
    Abstract:
    The Code of Federal Regulations (10CFR20.1201) mandates occupational dose limits to the shallow, lens and deep tissue layers. The NRC-accepted procedure of estimating dose to these layers from contamination events is laborious. The current work aims to further the development of a portable phoswich-style skin dosimeter that will operate in...
    Resource Type:
    Masters Thesis
    Full Text:
    Progress in the Development of a Portable Phoswich-Style

  • Low-Dose Ionizing Radiation Solid Cancer Risk in Adults : Radiation Hormesis Study Design

    Creator:
    Alhussan, Abdulaziz S.
    Abstract:
    Cancer risk at low-dose ionizing radiation has been the subject of great scientific controversy in the past century. The clear majority of national and international radiation protection regulators adopt the linear no-threshold (LNT) model based on the atomic-bomb survivors Life Span Study (LSS) for solid cancer risk assessment. The LNT...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ David M. Hamby Cancer risk at low-dose ionizing radiation has been the

  • A beta dosimeter and spectrometer utilizing plastic scintillators and a large-area avalanche photodiode

    Creator:
    Kriss, Aaron A.
    Abstract:
    The purpose of this research was to develop and test a radiation detector to perform beta dosimetry and spectroscopy. The detector utilizes plastic scintillator volumes to produce scintillation light in proportion to the amount of energy deposited in them, and a large-area avalanche photodiode to convert the light to electrical...
    Resource Type:
    Dissertation
    Full Text:
    David M. Hamby The purpose of this research was to develop and test a radiation detector to perform

  • Tissue weighting factors for radiation protection : derivation and parametric analysis

    Creator:
    Makinson, Kevin A.
    Abstract:
    Tissue weighting factors, w[subscript T], used to convert equivalent dose to effective dose, account for differences in radiosensitivity of various organs in the human body and allow users to compare individual organ detriment to whole body risk. They are explicitly calculated in ICRP 26, 60, and 103, although the methods...
    Resource Type:
    Masters Thesis
    Full Text:
            AN ABSTRACT OF THE THESIS OF  Kevin A

  • Design and analysis of radiation shielding eyewear

    Creator:
    Spackman, David A.
    Abstract:
    The recent reductions to the international dose limit recommendations for the lens of the eye have renewed interest in radiation protection strategies in interventional fluoroscopy, where eye-lens radiation exposure occurs frequently. Radiationshielding eyewear can significantly reduce lens dose in these scenarios, but accurate protection factors are elusive because they depend...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF David A. Spackman for the degree of Master of Science in Radiation

  • Utilization for a triple-layer phoswich detector for beta spectral stripping

    Creator:
    Alkhudhiri, Bandar
    Abstract:
    To quantify the relative activity contributions of beta emitters in mixed emission source spectra, the triple-layer phoswich detector was modeled to generate beta energy absorption spectra from mixed beta sources. These mixed sources include four pure beta emitters (C-14, Tc-99, Sr-90, and Y-90). Monte Carlo N-Particle (MCNP) computer code was...
    Resource Type:
    Masters Thesis
    Full Text:
    energy region. Farsoni and Hamby et al. (2005) introduced a triple-layer phoswich

  • Design, construction, and analysis of a skin contamination dosimeter

    Creator:
    Cazalas, Edward J.
    Abstract:
    International recommendations provided by the International Commission on Radiation Protection (ICRP), as well as national regulations, set by the U.S. Nuclear Regulatory Commission (NRC), state that the exposure of skin to highly concentrated radioactive sources should be monitored at specified depths in skin and kept below specific dose equivalence levels....
    Resource Type:
    Masters Thesis
    Full Text:
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  • Beta-particle backscatter factors and energy-absorption scaling factors for use with dose-point kernels

    Creator:
    Mangini, Colby D.
    Abstract:
    'Hot particle' skin dosimetry calculations are commonly performed using homogeneous dose-point kernels (DPK) in conjunction with scaling and backscatter models to account for non-homogeneous geometries. A new scaling model for determining the actual DPK for beta-particles transmitted by a high-Z source material has been developed. The model is based on...
    Resource Type:
    Dissertation
    Full Text:
    . Rather than instructing me on what to do when a crossroad was reached, Dr. Hamby provided guidance

  • Experimental shielding evaluation of the radiation protection provided by residential structures

    Creator:
    Dickson, Elijah D.
    Abstract:
    The human health and environmental effects following a postulated accidental release of radioactive material to the environment has been a public and regulatory concern since the early development of nuclear technology and researched extensively to better understand the potential risks for accident mitigation and emergency planning purposes. The objective of...
    Resource Type:
    Dissertation
    Full Text:
    : ________________________________________________ David M. Hamby The human health and environmental effects following a postulated accidental