Based on the instruments and methods integrated in the mobile laboratory, the staff operating in the contaminated area can provide all relevant radiological data that are required for decisions on the necessary measures to be taken. The mobile units can survey a large area within a relatively short period of time and transmit information to the evaluation centre. Besides the technical devices, the unit operated by the Health Physics Department of AERI is equipped with software tools which make data reduction and analysis possible on the site, thus providing better support for the decision making officials. The methods and procedures are regularly tested in international intercompari-son exercises which are organized each year in the region (central Europe) [3]. The mobile unit was used to make a countrywide survey of environmental radioactivity in Hungary in 1992, with special regard to contamination deposited after the Chernobyl accident.
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