Some comparative results of environmental gamma monitoring with LiF and CaSO4:Dy detectors

From the beginning of 1987 measurements of gamma dose rate background were made every quarter in 13 control points in the JINR environment by the TLD-700 detectors of the Harshaw firm. The values differ one from another less than 20% in all the control points, except one, disposed near charged particle accelerator, where the mean value of the gamma dose rate was higher than 80%. The mean gamma dose rate background value is 7.1±1.0 μR/h. CaSO4:Dy detectors with 2mm-Sn filter or without one were mounted simultaneously with the TLD-700 detectors in all the control points. Because of the energy dependence of the dose sensitivity readings of the CaSO4:Dy detectors were higher than 25% (with filter) or 75% (without filter) in comparison with the corresponding readings of the TLD-700 detectors. Utilization of the CaSO4:Dy detectors makes it possible to reduce the field exposition period by 3-5 times in comparison with the TLD-700 detectors. 10 refs.; 2 figs.; 3 tabs