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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electrode erosion during high voltage vacuum breakdown measured by neutron activation analysis and gamma ray spectrometry, noting plasma formation from electrode material
Apollo 11 lunar rocks and fines oxygen, Si and Al content determination by neutron activation analysis
Apollo 11 lunar dust examination by neutron activation analysis, determining spallogenic manganese 53
Apollo 11 fines and rocks major and trace elements data obtained by combined instrumental and neutron activation analysis
Neutron activation analysis of O, Si, Al, Mg, and Fe abundances in lunar rocks and fines from Apollo 12 mission
Neutron activation analysis of O, Si, Al, and Fe abundances in Apollo 12 lunar rock 12013
Neutron activation analysis of O, Si, and Al abundances in Apollo 12 lunar samples
Neutron activation analysis of O, Si, and Al in Apollo 11 rocks and fines
Neutron activation analysis of Apollo 11 and 12 rocks and soils, and X ray fluorescence and radiochemistry data
O, Si, Al and Fe abundances of Apollo 12 lunar rock 12013 from neutron activation analysis
Apollo 12 lunar rock 12013, discussing major and trace elemental abundances determination by neutron activation analysis
Apollo 12 specimens elemental abundance from neutron activation analysis, discussing fractional crystallization, partial melting, rare earth abundances and soil mixing model
Meteoritic material characterization from trace elements in Apollo lunar soil, core samples, breccia and anorthositic fragments by neutron activation analysis
Apollo 12 lunar soil, breccia and igneous rock samples, determining elemental abundances with spark source mass spectrometry and neutron activation analysis
Bulk elemental composition of Apollo 12 samples of lunar igneous and breccia rocks and soils from instrumental and radiochemical neutron activation analysis
Apollo 12 lunar rocks and fines under high energy neutron activation analysis, determining O, Si, Al, Mg and Fe abundances
Various radioisotope techniques were used as diagnostic tools for determining the performance of spacecraft propulsion feed system elements. Applications were studied in four tasks. The first two required experimental testing involving the propellant liquid oxygen difluoride (OF2): the neutron activation analysis of dissolved or suspended metals, and the use of radioactive tracers to evaluate the probability of constrictions in passive components (orifices and filters) becoming clogged by matter dissolved or suspended in the OF2. The other tasks were an appraisal of the applicability of radioisotope techniques to problems arising from the exposure of components to liquid/gas combinations, and an assessment of the applicability of the techniques to other propellants.