Abstract
The use of noise dosimeters is the standard method for noise exposure monitoring and assessment in the United States mining industry. The Mine Safety and Health Administration (MSHA) calibrates and maintains a fleet of various noise dosimeters and acoustical calibrators for the purpose of conducting enforcement activities and providing technical support to mine operators. The dosimeter fleet is comprised of both corded- and badge-type instruments. MSHA studies have conclusively revealed evidence in support of both types as to performing acceptably both in practice and when tested against standardized criteria, ANSI S1.25-1991. MSHA operates an acoustical calibration laboratory which maintains National Institute of Standards and Technology (NIST) traceable calibration records for all noise dosimeters and calibrators used for enforcement and support functions. The laboratory is currently in the process of modernization. Replacement test systems will provide increased reliability, reduced turn-around time, and improved accuracy through the implementation of modern computer-based components. Improvements provided by the laboratory modernization project will greatly improve quality assurance and provide the ability to pursue accredited compliance with ISO/IEC 17025:2005, through the American Association for Laboratory Accreditation (A2LA).
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