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Results for “RADIOACTIVITY”

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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At least 325 records · Page 18

All sources NASA NTRS DOE OSTI

NASA NTRS1962

Recombination and Mobility of Nuclear Radiation Induced Ionization in Liquid Hydrogen

In the present experiment, a stationary radioactive source (Kr-85) was allowed to produce ionization at a particular location in a flowing stream of liquid hydrogen. By measurement of the ionization collected at various points downstream for various velocities we were able to measure independently the recombination coefficient and the ionic mobility. In addition, we were able to obtain an approximate value of E, the fraction of the volumetric ionization rate which is available for volume recombination and production of ion currents.

Ionization↗

NASA NTRS1965

Double gloves reduce contamination of dry box atmosphere

Pair of encased low permeability hand gloves between which an inert gas circulates reduces dry box contamination. This innovation is applicable to dry boxes using radioactive and alkali metal compounds, submicron powders, and liquid metals.

Herbell, T. P.↗

NASA NTRS1964

Radiological safety handbook

Radiation hazard handbook supplement - persons exposed to ionizing radiation or radioactive materials

RADIATION HAZARD↗

NASA NTRS1964

The physiological-sanitary justification for substituting a luminous substance of inter- mittent action for the phosphor now used on airplane instrument dials

Substitution of green-colored zinc sulfide for relatively high radioactive luminous substances used on instrument panels

INSTRUMENT↗

NASA NTRS1965

Investigation of kilovolt ion sputtering quarterly progress report

Investigation of cesium ion sputtering of monocrystalline copper using radioactive tracer technique

COPPER↗

NASA NTRS1966

Radon gas, useful for medical purposes, safely fixed in quartz

Radon gas is enclosed in quartz or glass ampules by subjecting the gas sealed at a low pressure in the ampules to an ionization process. This process is useful for preparing fixed radon sources for radiological treatment of malignancies, without the danger of releasing radioactive gases.

Fields, P. R.↗

NASA NTRS1966

Effects of melting upon thermal models of the earth.

Concept of melting within Earth, effect on thermal model of Earth and differentiation of radioactive materials within Earth

GEOPHYSICS↗

NASA NTRS1966

Laser-stimulated nucleation in a bubble chamber.

Laser simulated nucleation in bubble chamber, comparing sensitivity with radioactively stimulated nucleation

NUCLEATION↗

NASA NTRS1966

Effect of discontinuous exposure of rats to a high oxygen-low pressure environment.

High oxygen at reduced pressure effect on metabolism of radioactive acetate in rats

RADIATION EXPOSURE↗

NASA NTRS1966

Life detection by means of metabolic experiments.

Life detection instrument incorporating metabolism and growth experiments including detection of metabolism of radioactive substrates, photosynthesis, etc

PHOTOSYNTHESIS↗

NASA NTRS1967

Fluid-bed fluoride volatility process recovers uranium from spent uranium alloy fuels

Fluid-bed fluoride volatility process recovers uranium from uranium fuels containing either zirconium or aluminum. The uranium is recovered as uranium hexafluoride. The process requires few operations in simple, compact equipment, and eliminates aqueous radioactive wastes.

Barghusen, J. J.↗

NASA NTRS1967

Ion exchange determines iodine-131 concentration in aqueous samples

Inorganic radioiodide in aqueous media is analyzed by separating the radioactive iodine-131 as the iodide ion on a silver chloride column. The activity in the final precipitate may be determined by beta or gamma counting.

Fairman, W. D.↗

NASA NTRS1967

Apparatus for fabrication of americium- beryllium neutron sources prevents capsule contamination

Modified gloved enclosure is used to fill a capsule with a mixture of americium and beryllium radioactive powders to seal weld the opening, and to test it for leaks. It contains a horizontal partition, vortex mixer, mounting press, welder, test vessel, and radiation shielding to prevent surface contamination.

Mohr, W. C.↗

NASA NTRS1967

Radiation counting technique allows density measurement of metals in high-pressure/ high-temperature environment

Radioactive tracers induced by neutron irradiation provide a gamma ray flux proportional to the density of a metal, allowing density measurement of these metals in extreme high-temperature and high-pressure environments. This concept is applicable to most metals, as well as other substances.

Dillion, I. G.↗

NASA NTRS1967

Training course for radiation safety technicians

Course of instruction includes sections on basic information, natural radioactivity, properties of alpha, beta, gamma, X rays, and neutrons, concepts of radiation units and dose determinations, shielding, biological effects, background radiation, radiation protection standards, and internal dose calculation.

Lasuk, S. R.↗

NASA NTRS1968

Computer program calculates gamma ray source strengths of materials exposed to neutron fluxes

Computer program contains an input library of nuclear data for 44 elements and their isotopes to determine the induced radioactivity for gamma emitters. Minimum input requires the irradiation history of the element, a four-energy-group neutron flux, specification of an alloy composition by elements, and selection of the output.

Heiser, P. C.↗

NASA NTRS1968

Detection sensitivities in 3-8 MeV neutron activation

Study of detection sensitivities of 73 radioactive elements using fast unmoderated neutrons includes experiments for irradiation, cooling and counting conditions. The gamma ray emission spectra is used to identify the unknown material.

Wahlgren, M. A.↗

NASA NTRS1968

Effects of surface preparation on quality of aluminum alloy weldments

Study of surface preparations and surface contamination effects on the welding of 2014 aluminum involves several methods of surface analysis to identify surface properties conducive to weld defects. These methods are radioactive evaporation, spectral reflectance mass spectroscopy, gas chromatography and spark emission spectroscopy.

Kizer, D.↗