engleski

Intercomparison of various dosimetry systems for routine individual monitoring

According to the studies of EURADOS (www.eurados.org) in addition to film dosimeters thermoluminescent (TLD) and recently radiophotoluminescent (RPL) dosimeter systems are the most widely used for individual monitoring. The situation in personnel dosimetry is permanently changing. For example in the last years because of introducing RPL dosimetry in Europe, the number of film controlled workers was reduced about 50%. In order to reach a high international standard in the application of these dosimeters for routine individual monitoring, there is a need for intercomparisons. Therefore an intercomparison was organised with the participation of six dosimetry services from six countries. The objectives of the study were to compare and to improve laboratory calibrations, to compare the results of different dosimetry systems at the same irradiation conditions. The task of the participating laboratories was to irradiate their own dosimetry system used for routine individual dosimetry together with RPL dosimeters received from Chiyoda Technol Corporation with a dose Hp(10)=0.1 mSv by narrow spectra X-ray beams of radiation quality N-60. The RPL (GD-450) dosimeters after irradiation were evaluated by Chiyoda Technol Corporation. The results of this intercomparison indicated that the RPL and the other passive solid state detectors are very suitable for individual monitoring. The establishment of this international intercomparison allowed a broad exchange of experience. As a consequence, the calibration and measuring procedures used in particular laboratories, as well as the quality of the dosimeter systems employed could be improved step by step. We expect that the results of this investigation may encourage the participating services to improve the dosimetry methods and procedures.

individual dosimetry; TLD; RPL; intercomparison

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