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in creator/contributor: "Biermann, A.H."  
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Aerosol deposition and losses in two alpha air monitors

Description: We assessed particle deposition and loss occurring in two alpha-air monitors: an Eberline Alpha-3 Continuous Air Monitor (CAM) and a working-area transuranic aerosol monitor (WOTAMS). We investigated the dependence of particle size on losses in the sampling inlets and the real-time alpha detector areas for both instruments. We determined the uniformity of particle deposition on the filter to ascertain the effectiveness of the detector and collection-filter configuration. Results indicate that p… more
Date: November 27, 1985
Creator: Biermann, A.H. & Sawyer, S.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Field evaluation of prototype electrofibrous filters

Description: New prototype electrofibrous filters were designed, built and evaluated in laboratory tests and in field installations. Two prototypes were designed for use in nuclear ventilation ducts as prefilters to HEPA filters. One prototype is designed to be a permanent component of the ventilation system while the other is a disposable unit. The disposable electrofibrous prefilter was installed in the exhaust stream of a glove box in which barrels of uranium turnings are burned. Preliminary tests show t… more
Date: September 30, 1982
Creator: Kuhl, W. D.; Bergman, W.; Biermann, A. H. & Lum, B. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A transuranic aerosol measurement system: Preliminary results

Description: We have completed the design, fabrication, and assembly of a computer-based prototype system for the measurement of transuranic aerosols in the workplace and environment. This system (called WOTAMS for Workplace Transuranic Aerosol Measurement System) incorporates two detectors: (1) an in-line solid-state alpha detector that sends out an alarm the moment a transuranic release occurs, and (2) an in-vacuum detector that increases off-line-analysis sensitivity. The in-line sensitivity of the syste… more
Date: October 1, 1986
Creator: Prevo, C. T.; Kaifer, R. C.; Rueppel, D. W.; Delvasto, R. M.; Biermann, A. H. & Phelps, P. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electrostatic air filters generated by electric fields

Description: This paper presents theoretical and experimental findings on fibrous filters converted to electrostatic operation by a nonionizing electric field. Compared to a conventional fibrous filter, the electrostatic filter has a higher efficiency and a longer, useful life. The increased efficiency is attributed to a time independent attraction between polarized fibers and charged, polarized particles and a time dependent attraction between charged fibers and charged, polarized particles. The charge on … more
Date: January 27, 1981
Creator: Bergman, W.; Biermann, A. H.; Hebard, H. D.; Lum, B. Y. & Kuhl, W. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrofibrous prefilters for use in nuclear ventilation systems

Description: We have established a comprehensive program for the US Department of Energy to develop electrofibrous prefilters to extend the life of High Efficiency Particulate Air (HEPA) filters that are used in the nuclear industry. We have selected the electrofibrous filter because, compared to the mechanical fibrous filter, it has a higher efficiency and longer lifetime. Two different electrofibrous filters have been developed for use in nuclear ventilation systems. One prototype is a stationary prefilte… more
Date: February 19, 1981
Creator: Bergman, W.; Kuhl, W. D.; Russell, W. L.; Taylor, R. D.; Hebard, H. D.; Biermann, A. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Prototype Electrofibrous Filters for Nuclear-Ventilation Ducts

Description: Two prototypes electrofibrous filters were designed, built and evaluated in laboratory tests and in field installations. These prototypes were designed for use in nuclear ventilation ducts as prefilters to HEPA filters. One prototype is designed to be a permanent component of the ventilation system while the other is a disposable unit. The disposable electrofibrous prefilter was installed in the exhaust stream of a glove box in which barrels of uranium turnings are burned. Preliminary tests sho… more
Date: December 2, 1982
Creator: Bergman, W.; Kuhl, W. D.; Biermann, A. H.; Johnson, J. S. & Lum, B. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of permanently charged electrofibrous filters

Description: These studies showed that loading the permanently charged filters with captured aerosols will lead to a neutralization of the filter charge. The transfer from the captured aerosol to the fiber surface and the subsequent neutralization of fiber charge. The increased efficiency is due to the additional mechanical capture by the particle deposits. The minimum efficiency obtained during the loading of solid aerosols is determined by the aerosol charge, with highly charged aerosols producing a lower… more
Date: October 18, 1982
Creator: Biermann, A. H.; Lum, B. Y. & Bergman, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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