Accession Number : AD0635209

Title :   DEVICES FOR DETECTING AND TRACING THE PATHS OF IONIZING PARTICLES.

Corporate Author : WASHINGTON UNIV ST LOUIS MO DEPT OF PHYSICS

Personal Author(s) : Hughes, Arthur L.

Report Date : 31 JUL 1966

Pagination or Media Count : 9

Abstract : The performance of spark chambers traversed by heavily ionizing alpha particles from polonium-210 was studied. Bright sparks along the alpha particle tracks were readily obtained up to about 60 degrees with the normal to the electrodes. The densely packed ion-pairs favor the overlapping of the electron avalanches, thereby making it possible for the spark to follow the particle up to wide angles. Experiments were made showing that the addition of 0.1 percent or less of SF6 very greatly reduced the lifetime of the free electrons initiating the electron avalanches. (Author)

Descriptors :   (*ALPHA PARTICLE DETECTORS, PERFORMANCE(ENGINEERING), (*IONIZATION CHAMBERS, PERFORMANCE(ENGINEERING), SPARKS, ALPHA PARTICLES, PARTICLE TRAJECTORIES, ELECTRONS, HELIUM, NEON, SULFUR COMPOUNDS, FLUORIDES

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE