Paul Bjorkholm

TL;DR: An imaging device for increasing the ability to recognize, in x-ray produced images, materials of low atomic number was presented in this paper, where at least a pair of X-ray detectors were employed, each pair associated with signal processing apparatus and a display.

TL;DR: In this article, two serially arranged detectors are used to develop simultaneous signals from transmitted energy of different characteristics, and the characteristics of the detectors may be selected to produce the desired effect, e.g., a gaseous detector may be pressurized in accordance with its function, a scintillating screen may be tilted or its length may be chosen to produce a desired absorption characteristic.

TL;DR: The results indicate the existence of a differential lunar highland crust, probably feldspathic, related to the plagioclase-rich materials previously found in the samples from Apollo 11, Apollo 12, Apollo 14, Apollo 15, and Luna 16.

TL;DR: In this article, an X-ray detector using microchannel plates as a photocathode surface and imaging photoelectron multiplier, and a crossed wire grid as a two-dimensional position-sensitive detector is described.

TL;DR: The lunar surface was mapped with respect to magnesium, aluminum, and silicon as aluminum/ silicon and magnesium/ silicon intensity ratios along the projected ground tracks swept out by the orbiting Apollo 16 spacecraft to confirm the idea that the moon has a widespread differentiated crust (the highlands).