OBSERVATIONS ON NICKEL - BEARING COSMIC - DUST COLLECTED IN THE STRATOSPHERE

摘要

Stratospheric dust particles collected on plastic surfaces have been examined microchemically for the presence of nickel using dim ethyl glyoxime as a specific developing reagent. Samples collected from four balloon flights with plateau elevations between 77,000 and 112,000 feet indicate the deposition of 0. 17 to 0.36 nickel bearing particles per cm per day of exposure. Most of the color reactions for nickel vary between 20 and 40 microns diameter, but some dust particles as small as 1 or 2 microns have given positive reactions. Experimental details of the technique are described.