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Title: Filter Paper: Solution to High Self-Attenuation Corrections in HEPA Filter Measurements

Abstract

An 8 by 8 by 6 inch High Efficiency Particulate Air (HEPA) filter was measured as part of a uranium holdup survey in June of 2005 as it has been routinely measured every two months since 1998. Although the survey relies on gross gamma count measurements, this was one of a few measurements that had been converted to a quantitative measurement in 1998. The measurement was analyzed using the traditional Generalized Geometry Holdup (GGH) approach, using HMS3 software, with an area calibration and self-attenuation corrected with an empirical correction factor of 1.06. A result of 172 grams of {sup 235}U was reported. The actual quantity of {sup 235}U in the filter was approximately 1700g. Because of this unusually large discrepancy, the measurement of HEPA filters will be discussed. Various techniques for measuring HEPA filters will be described using the measurement of a 24 by 24 by 12 inch HEPA filter as an example. A new method to correct for self attenuation will be proposed for this measurement Following the discussion of the 24 by 24 by 12 inch HEPA filter, the measurement of the 8 by 8 by 6 inch will be discussed in detail.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN
Sponsoring Org.:
USDOE - Office of Defense Programs (DP)
OSTI Identifier:
899138
Report Number(s):
Y/DK-2152 Rev 1
TRN: US0701899
DOE Contract Number:  
DE-AC05-00OR22800
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; AIR FILTERS; RADIATION MONITORING; URANIUM 235; ACCURACY; MEASURING METHODS

Citation Formats

Oberer, R.B., Harold, N.B., Gunn, C.A., Brummett, M., and Chaing, L.G. Filter Paper: Solution to High Self-Attenuation Corrections in HEPA Filter Measurements. United States: N. p., 2005. Web. doi:10.2172/899138.
Oberer, R.B., Harold, N.B., Gunn, C.A., Brummett, M., & Chaing, L.G. Filter Paper: Solution to High Self-Attenuation Corrections in HEPA Filter Measurements. United States. doi:10.2172/899138.
Oberer, R.B., Harold, N.B., Gunn, C.A., Brummett, M., and Chaing, L.G. Sat . "Filter Paper: Solution to High Self-Attenuation Corrections in HEPA Filter Measurements". United States. doi:10.2172/899138. https://www.osti.gov/servlets/purl/899138.
@article{osti_899138,
title = {Filter Paper: Solution to High Self-Attenuation Corrections in HEPA Filter Measurements},
author = {Oberer, R.B. and Harold, N.B. and Gunn, C.A. and Brummett, M. and Chaing, L.G.},
abstractNote = {An 8 by 8 by 6 inch High Efficiency Particulate Air (HEPA) filter was measured as part of a uranium holdup survey in June of 2005 as it has been routinely measured every two months since 1998. Although the survey relies on gross gamma count measurements, this was one of a few measurements that had been converted to a quantitative measurement in 1998. The measurement was analyzed using the traditional Generalized Geometry Holdup (GGH) approach, using HMS3 software, with an area calibration and self-attenuation corrected with an empirical correction factor of 1.06. A result of 172 grams of {sup 235}U was reported. The actual quantity of {sup 235}U in the filter was approximately 1700g. Because of this unusually large discrepancy, the measurement of HEPA filters will be discussed. Various techniques for measuring HEPA filters will be described using the measurement of a 24 by 24 by 12 inch HEPA filter as an example. A new method to correct for self attenuation will be proposed for this measurement Following the discussion of the 24 by 24 by 12 inch HEPA filter, the measurement of the 8 by 8 by 6 inch will be discussed in detail.},
doi = {10.2172/899138},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2005},
month = {Sat Oct 01 00:00:00 EDT 2005}
}

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