Advances in gamma-ray spectroscopy : compton suppression and gamma-gamma coincidence
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This project aims to improve research in gamma-ray spectroscopy by using advanced detector systems. These systems are designed to reduce interference inherent in gamma-ray spectroscopy by rejecting Compton scattering events from high-energy gamma-rays, as well as look at cascading decays of gamma-rays through gamma-gamma coincidence counting. By combining these methods, one is able to lower detection limits for many elements than would otherwise be possible. This work also takes advantage of neutron activation analysis, which allows stable elements to be analyzed by activating them with neutrons, causing them to become unstable and decay with radioactive signatures. By analyzing these signatures, one is able to detect trace levels of elements with relatively small samples sizes (< 1g) and in a nondestructive manner.
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Multispectral gamma-ray analysis using clover detectors with application to uranium fission product analysis Horne, Steven Michael (2013-05)A high-efficiency gamma-ray counting system has been built at Los Alamos National Laboratory for use in analyzing nuclear forensics samples. This system consists of two clover high-purity germanium detectors and is surrounded ...
Identification of the radionuclides in spent nuclear fuel that may be detected by Compton suppression and gamma-gamma coincidence methods Schreiber, Samuel Stuart (2011-05)The nuclides present in spent nuclear fuel are categorized according to their capacity for detection by Compton suppression or gamma-gamma coincidence methods. The fifty nuclides with the highest activities in spent fuel ...
Meng, Qingchao, master of arts in cell and molecular biology (2011-08)In this thesis, a 4.7Å crystal structure of the human mitochondria DNA polymerase γ catalytic complex is reported. Though the DNA substrate-binding site is not identifiable in the structure, two conformational changes ...