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Radiation protection instrumentation. Radon and radon decay product measuring instruments - General principles Ingestion-build-59651 tanks and pipelines that haveWhat is BS IEC 61577 1 Principles for radon and radon decay product measuring instruments about? BS IEC 61577 is a European standard on radiation protection instrumentation that discusses the general principles for radon and radon decay product measuring instruments to ensure protection against radiation hazards. The IEC 61577 series covers the general features concerning test and calibration of radon and radon decay product measuring instruments. BS