Personnel dosimetry carried out by the Central Laboratory for Radiological Protection in Poland - Practice, research and experience

The Central Laboratory for Radiological Protection (CLOR) carries out a centralized personnel monitoring service for radioisotope laboratories and nuclear installations in Poland. The number of persons recently monitored by film method is 7200. According to the results obtained - about 93 per cent of the persons monitored obtained yearly doses below 5 mSv and about 0.24 per cent received doses exceeding 50 mSv. The mean annual dose equivalents calculated for the persons working in industrial establishments in the years 1980-1982 were almost twice as high as the mean value for the whole group monitored. The largest number of cases of 50 mSv dose exceeding have been noted in industrial establishments, namely in the work with radiographic facilities. To improve the method of gamma, X-ray, X-ray + gamma radiation dose evaluation in routine monitoring a dosimetric programme has been modified to use with computer Mera 400. To check and to improve the accuracy of the methods used in personnel dosimetry CLOR has participated in several international intercomparison studies. The results have shown that the precision of photon radiation dose measurements by film and TL methods is satisfactory at present. (author)