Physics Colloquium, "PREDICTED RESPONSES FOR A PARTICULATE DETECTION SYSTEM," by Professor Mark Tries, Associate Professor of Physics at UMASS Lowell

Science / Technology - Colloquium

Wednesday, December 12, 2012
4:00 PM-5:00 PM

Olin Hall

Predicted counting rate responses were developed for a particulate detection system that
is used for continuous monitoring for the presence of radioactive particulates in the effluent air
from a research reactor. The particulate detection system consists of a moving filter paper
assembly; a thin plastic scintillation detector; and a rate meter output, and is part of a
comprehensive stack monitoring system. A predicted response was derived for the case of a
steady-state activity distribution across the surface of the moving filter paper that is in proximity
to the detector, and was determined to be 1.59×107 cpm per unit airborne concentration of 138Cs
(expressed in units of Bq cm-3 ), where 138Cs was used as an indicator for a hypothetical fission
product release. The corresponding response model provided by the manufacturer was found to
underestimate airborne activity concentrations by about an order of magnitude. A predicted
response also was derived for the case of a rapid change in airborne activity concentration, which
was formulated based on the kinetics of the rate meter circuit, and was used to establish alarm
settings and detection limits for the particulate detection system.

Refreshments will be served in OH 118 at 3:30 P.M.

Cost: Free

Suggested Audiences: College

Phone: 508-831-5258

Last Modified: December 3, 2012 at 11:30 AM

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