engleski

Intercomparisons of TLDs for environmental monitoring

In order to reach a high international standard in the application of TLDs in routine environmental monitoring, there is a need for intercomparisons. The US Department of Energy Environmental Measurements Laboratory has sponsored 11 international intercomparisons since 1972. The most recent intercomparison was organised in 1996 and involved 121 participants from 31 countries. The European community started in 1984 with the intercomparisons, the latest was held in 1994. All these intercomparison as well as those organised by the National Radiation Protection Board. UK in 1985 and by selected laboratories of the former Council of Mutual Economic Aid (1989) have combined laboratory and field irradiations to improve the state of the art in this field and serve as a periodic quality control for the participating laboratory. Within all these intercomparisons one lab was responsible for the organisation. In the study organized in frame of a Croatian-German-Hungarian scientific cooperation the intercomparisons was based on the joint-cross calibration in the laboratories involved and an exchange of a dosimeters within the respective national environment monitoring programs. The objectives of the study were to compare and to improve laboratory calibrations, to compare the results of different dosimetry systems at the same field site, to determine the field fading. The results did not indicate any seasonal influence at all locations on the natural backgroung level as well as any improvement of results using fading correction. Recently a similar intercomparison was initiated that focuses on new developed high sensitivity TL detectors.

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