منابع مشابه
HEPA EXHAUST FILTER IV HEPA SUPPLY FILTER I / All
A microbiological survey of the effectiveness of class II (laminar flow) 'safety' cabinets found in the UK in the last six years is recorded. Only two of the nine units tested approached the containment of aerosols achieved by a good class I (exhaust protective) cabinet. The others were potentially hazardous if used with pathogenic material. The National Sanitation Foundation and the British St...
متن کاملPerformance of Multiple HEPA Filters Against Plutonium Aerosols
Field sampling has provided C. Elder, and Manuel Gonzales general criteria defining plutonium aerosol size characteristics and activity concentrations from typical plutonium operations. Two fabrication facilities have aerosols with activity median aerodynamic diameter’s (amad) ranging from 2 to 5 pm; the two research and development facilities indicate amad’s ranging from 1 to 4 ~; and a recove...
متن کاملHEPA Filters and Filter Testing A Comparison of Factory Tests and In-Service Tests
HEPA filters, once known as absolute filters, were originally developed as the particulate stage of a chemical, biological, radiological (CBR) filtration/adsorber unit for use by the U.S. Armed Services. In the late 1940s the U.S. Atomic Energy Commission adopted them for use for the containment of airborne radioactive particulates in the exhaust ventilation systems of experimental reactors as ...
متن کاملEvaluation of Glass Fiber Hepa Filters as a Function of Media Velocity
The Department of Energy currently employs high-efficiency particulate air (HEPA) filters in a variety of applications, such as particulate matter removal from ventilation air and treatment of off-gasses from storage or remediation of mixed wastes. Section FC of the ASME AG-1 Code addresses glass fiber HEPA filters and restricts the media velocity to a maximum of 5 ft/min. Advances in filtratio...
متن کاملCriteria for Calculating the Efficiency of HEPA Filters During and After Design Basis Accidents
We have reviewed the literature on the performance of high efficiency particulate air (HEPA) filters under normal and abnormal conditions to establish criteria for calculating the efficiency of HEPA fitters in a DOE nonreactor nuclear facility during and after a Design Basis Accident (DBA). The literature review included the performance of new filters and parameters that may cause deterioration...
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ژورنال
عنوان ژورنال: JAPANES JOURNAL OF MEDICAL INSTRUMENTATION
سال: 1975
ISSN: 0019-1736,2432-9940
DOI: 10.4286/ikakikaigakuzassi.45.5_252