• Health physics · Nov 2003

    Comparative Study

    Validation of the integrity of a HEPA filter system.

    • Wei-Hsung Wang.
    • Department of Radiological and Environmental Management, School of Health Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, USA. weihsung@lsu.edu
    • Health Phys. 2003 Nov 1; 85 (5 Suppl): S101-7.

    AbstractThe objective of this study was to establish a delayed air sampling method to verify the integrity of an existing HEPA filter system in a ventilated fume hood. (238U,232Th)O2 microspheres were generated to fabricate cement nuclear fuel pellets in a HEPA-filtered hood. To comply with the air effluent concentration limits by NRC, the capture efficiency of the HEPA filter was examined. An in-line isokinetic air sampling system was installed downstream of the HEPA filter. Utilizing a gas flow proportional counter, 212Pb was used as a surrogate to indicate any possible penetration of the (238U,232Th)O2 particles through the HEPA filter. Based on the experimental results, this delayed sampling method proved to be an easy and effective way to validate the integrity of the HEPA filter.

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