Performance of a Borehole X-ray Fluorescence Spectrometer for Planetary Exploration

We have designed and constructed a borehole X-ray Fluorescence Spectrometer (XRFS) as part of the Mars Subsurface Access program [1]. It can be used to determine the composition of the Mars regolith at various depths by insertion into a pre-drilled borehole. The primary requirements and performance metrics for the instrument are to obtain parts-per-million (ppm) lower limits of detection over a wide range of elements in the periodic table (Magnesium to Lead). Power consumption during data collection was also measured. The prototype instrument is complete and preliminary testing has been performed. Terrestrial soil Standard Reference Materials were used as the test samples. Detection limits were about 10 weight ppm for most elements, with light elements being higher, up to 1.4 weight percent for magnesium. Power consumption (excluding ground support components) was 12 watts

Improvements in X-Ray Spectrometry for Planetary Surface Exploration

Recent innovations in X-ray instrumentation have enabled a new generation of planetary XRS instruments exhibiting performance matching terr estrial laboratory results

Bilder av en far

Kapitlet diskuterar far och son-relationer i skönlitteratur från Antiken till idag.The chapter discusses father and son relations as depicted in fiktion from ancient times until today

Ny svensk prosa

Även utgiven på engelska, spanska, ryska och franska

Jag hoppas på ett erkännande av att humanistisk forskning behövs

Artikeln diskuterar humanioras ställning i Sverige i ljuset av regeringsskiftet 2006.The article discusses the state of research in the humanities in the light of political change in Sweden after the election in 2006