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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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Magnetic field quenching of enhanced pulses produced in silicon nuclear particle detectors upon irradiation by light particles and low energy gamma rays
This paper discusses the use of boron implantation on high resistivity P type silicon before oxide growth to compensate for the presence of charge states in the oxide and oxide/silicon interface. The presence of these charge states on high resistivity P type silicon produces an inversion layer which causes high leakage currents on N(+)P junctions and high surface conductance. Compensating the surface region by boron implantation is shown to result in oxide passivated N(+)P junctions with very low leakage currents and with low surface conductance.
Space reactor power monitors based on silicon carbide (SiC) semiconductor neutron detectors are proposed. Detection of fast leakage neutrons using SiC detectors in ex-core locations could be used to determine reactor power: Neutron fluxes, gamma-ray dose rates and ambient temperatures have been calculated as a function of distance from the reactor core, and the feasibility of power monitoring with SiC detectors has been evaluated at several ex-core locations. Arrays of SiC diodes can be configured to provide the required count rates to monitor reactor power from startup to full power Due to their resistance to temperature and the effects of neutron and gamma-ray exposure, SiC detectors can be expected to provide power monitoring information for the fill mission of a space reactor.
Silicon detector for beta radiation measurement - fabrication of surface barrier silicon detector, and Fortran program for analysis of beta ray measurements
Theory, fabrication, and electric properties of lithium drifted silicon radiation detector with large sensitive volume
Straggling functions for protons in thick silicon radiation detectors are computed by Monte Carlo simulation. Mean energy loss is constrained by the silicon stopping power, providing higher straggling at low energy and probabilities for stopping within the detector volume. By matching the first four moments of simulated energy-loss distributions, straggling functions are approximated by a log-normal distribution that is accurate for Vavilov k is greater than or equal to 0:3. They are verified by comparison to experimental proton data from a charged particle telescope.
Observation of nuclear pulse height increases in silicon p-n junction radiation detectors
Lithium drifted silicon semiconductor radiation detectors, proton absorption in metal, plastics, and tissue, and detector behavior
Fluctuations of energy loss by charged particles in lithium-drifted silicon semiconductor detectors
Research on lithium drifted silicon detectors, Compton effect using superconducting magnet beta ray spectrometer, and high Z semiconductors for radiation detectors
Measurement of x-rays from the surface of objects can tell us about the chemical composition Absorption of radiation causes characteristic fluorescence from material being irradiated. By measuring the spectrum of the radiation and identifying lines in the spectrum, the emitting element (s) can be identified. This technique works for any object that has no absorbing atmosphere and significant surface irradiation : Our Moon, the icy moons of Jupiter, the moons of Mars, the planet Mercury, Asteroids and Comets
Reports on radiation medicine, radiobiology, EPR STUDIES of OH radicals in ice, radiation doses on manned space missions, silicon detectors, and recovery of yeast after irradiation
Research on large volume lithium drifted silicon and germanium radiation detectors
Solid state detector - N type silicon surface barrier diode as microparticle detector
High temperature behavior and long-term stability of lithium drifted silicon surface barrier charged particle detectors
Chemical analysis of surfaces using alpha-particle interactions from curium 242 sources and semiconductor silicon detectors
Neutron spectra calculations from pulse height due to neutron interactions with protons and alpha particles in silicon charged particle detector
Response of lithium-drifted silicon detectors for radiobiologic applications