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FIZIKA B 12 (2003) 2, 97 - 116
 
RADIATION HARDNESS OF THE PIBETA DETECTOR COMPONENTS
E. FRLEŽ, T. A. CAMPBELL, I. J. CAREY and
D. POČANIĆ
Department of Physics, University of Virginia, Charlottesville,
VA 22904-4714, USA
Received 19 November 2002; revised manuscript received 25 November 2003
Accepted 8 December 2003 Online 3 March 2004
We have examined long-term changes in signal amplitude gain, energy resolution and
detection efficiency of the active components of the PIBETA detector system. Beam-defining
plastic scintillation counters were operated in a ~1MHz stopped
p+ beam for a period of 297 days, accumulating
radiation doses of up to 2·106 rad. Detectors in the charged particle
tracking system - a pair of cylindrical multi-wire proportional chambers and a thin
plastic scintillation barrel-shaped hodoscope array - were irradiated during the same
running period with an average dose of ~ 4 ·104 rad.
Individual CsI (undoped crystal) calorimeter detectors received an average dose of ~ 120 rad, mainly from photons, positrons and protons
originating from p+ hadronic interactions as well as
from p+ and m+
weak decays at rest in the active target.
PACS: 61.80.Ed, 61.80.Fe, 29.40.Cs, 29.40.Gx, 29.40.Mc, 29.40.Vj
UDC621.387
Keywords: long-term temporal stability of detector gain, energy resolution and
detection efficiency, radiation hardness, radiation resistance, radiation damage
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