A new large-area detector system was constructed at the University of Chicago for direct measurements of heavy cosmic ray nuclei (oxygen to iron) up to about 10 TeV/nucleon. TRACER (”Transition Radiation Array for Cosmic Energetic Radiation”) uses plastic scintillators to measure charge and a proportional tube array to measure energy via specific ionization and transition radiation. While TRACE...

As one of the key components in the CBM experiment, the Transition Radiation Detector (TRD) will play a significant role in the particle identification. A fast detector with double sided readout chambers[1] and a ALICE type of detector with both drift and amplification regions have been designed for the circumstance of high particle rates. We propose to build a fast detector with an amplificati...

background: a substantial part of the public’s natural radiation dose is due to the inhalation of radon gas. most of the exposure occurs indoors where the airborne concentration of radon and its decay products is usually higher than outdoors. materials and methods: radon activity concentration has been measured twice in 50 classrooms in 5 levels (10 each) during summer and winter using solid-st...

A Transition Radiation Detector to identify electrons at 90% ef-ciency with a rejection factor against pions of 10 3 on an area of 2:85 2:85 m 2 has been constructed for the NOMAD experiment. Each of its 9 modules includes a 315 plastic foil radiator and a detector plane of 176 vertical straw tubes lled with a xenon-methane gas mixture. Details of the design, construction and operation of the d...