Calculation of scanning efficiencies for portable instruments used to detect particulate contamination Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/b5644v00q

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  • Efforts are continually being made in remediation surveys to reduce the time and manpower required to perform work while maintaining the ability to detect low levels of contamination. To this end, organizations are utilizing portable instrumentation in conjunction with global positioning systems (GPS). This combination of technologies allows a surveyor to scan an area and record the count rate information along with the GPS coordinates. The data can then be mapped and cleanup efforts focused on areas that exceed set action levels. This study examined the effect of scanning speed on detector efficiency for four detectors and whether the scanning efficiency could be predicted. To accomplish this, a track was designed to allow a source to pass under the detector at speeds up to 1 m s⁻¹. To simulate the use of a GPS, a data-logger was used to collect the data for each run. Decreases in scanning efficiency were seen not only as the result of scanning speed but also as a function of signal processing. Results indicate that the scanning efficiency could be predicted using an equation that includes the static efficiency, detector diameter, the scanning speed, and the response time.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-08-29T18:34:44Z (GMT) No. of bitstreams: 1 MossIIStephenCraig2001.pdf: 1310222 bytes, checksum: ddbddc3f561e212e14879181512d2fe5 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-08-29T18:36:33Z (GMT) No. of bitstreams: 1 MossIIStephenCraig2001.pdf: 1310222 bytes, checksum: ddbddc3f561e212e14879181512d2fe5 (MD5)

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