A Multiple Radiation Effects Facility for the Study of Structural and Flexible Materials Exposed to the Space Environment
A radiation effects facility is described which utilizes multiple radiation sources, vacuum chambers and thermal control to simulate the space environment. Use of the facility for eight months' continuous testing of thin film flexible materials is discussed and summary results, primarily from in-situ testing, are presented.
Transmission and reflection of electrons by foils
Abstract This paper describes Monte Carlo calculations pertaining to the penetration of electron beams through foils. The method of calculation is validated by comparisons with experimental transport data at energies between 50 keV and 1 MeV. New data are presented on the transmission and reflection of electrons through beryllium, mylar, aluminum, and titanium foils, for incident beam energies between 100 and 400 keV. The results given include transmission and reflection coefficients and the energy spectra and angular distributions of transmitted electron beams.
Back‐Scattering of Megavolt Electrons from Thick Targets
Measurements are reported of the number and energy of the electrons which rebound from thick metal targets bombarded at normal incidence by monoenergetic electrons of from 1 to 3 Mev. The ratio of back‐scattered to incident electron current, measured for twelve metal targets, was found to vary from 0.47 for 1‐Mev electrons incident on U to 0.01 for 3‐Mev electrons on Be. The total energy scattered backward from targets of Al, Cu, and Pb bombarded with 1‐ to 3.5‐Mev electrons was determined by calorimetric methods. This energy diminished from 34% of the incident energy for Pb bombarded with 1‐Mev electrons to 1% for Al bombarded with 3.5‐Mev electrons. The dependence of the number and energy of the back‐scattered electrons on the atomic number of the target and on the incident electron energy is discussed.