Modeling and measurements for mitigating interference from skyshine

Skyshine, the radiation scattered in the air above a high-activity gamma-ray source, can produce interference with radiation portal monitor (RPM) systems at distances up to even many hundred meters. Pacific Northwest National Laboratory (PNNL) has been engaged in a campaign of measurements, design w...

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Bibliographic Details
Published in2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC) pp. 976 - 980
Main Authors Kernan, W.J., Mace, E.K., Siciliano, E.R., Conlin, K.E., Flumerfelt, E., Kouzes, R.T., Woodring, M.L.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2009
Subjects
Collimators
Instruments
Interference
Laboratories
Monte Carlo methods
NIST
Portals
Prototypes
Radiation monitoring
System testing
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Summary:Skyshine, the radiation scattered in the air above a high-activity gamma-ray source, can produce interference with radiation portal monitor (RPM) systems at distances up to even many hundred meters. Pacific Northwest National Laboratory (PNNL) has been engaged in a campaign of measurements, design work and modeling that explore methods of mitigating the effects of skyshine on outdoor measurements with sensitive instruments. An overview of our work with shielding of skyshine is being reported by us in another paper at this conference. This paper will concentrate on two topics: measurements and modeling with Monte Carlo transport calculations to characterize skyshine from an iridium-192 source, and testing of a prototype louver system, designed and fabricated at PNNL, as a shielding approach to limit the impact of skyshine interference on RPM systems.
ISBN:9781424439614
1424439612
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2009.5402445