Abstract
Abstract In view of the health effects of short-lived radon daughters, various methods and instruments for determining their concentrations in air have been developed in the National Board for Atomic Safety and Radiation Protection (SAAS) of the GDR for reasons of radiation protection. A survey is given of the respective measurement requirements and of the quantities measured. Devices for short-term as well as time-integrated measurements of the potential alpha energy concentration, using different kinds of detectors, are described in detail, including the determination of the equilibrium factor and of the free fraction of short-lived daughters. Information is given regarding international comparison of measuring devices, of calibration methods applied at the SAAS and of elaboration of a primary standard for the unit of the potential alpha energy concentration. The use of the methods and instruments in the radiation protection practice of the SAAS is outlined.
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