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AbstractAbstract
[en] The widespread development and application of X-ray and nuclear energy resulted in the problem of ionizing radiation dosimetry also in Hungary. The individual monitoring started in 1955 using film badge and various ''pen type'' ionization chambers with different measuring ranges to determine the external photon radiation doses. Since 1966 the film badge has been accepted as the official personal dosimeter system in Hungary. The film monitors are presently processed bimonthly. The personal monitoring for about 16 000 occupationally exposed ''A category'' workers is conducted by the National Research Institute of Radiobiology and Radiohygiene, with Kodak film badge. The calibration of dosimeters is performed in the primary standard laboratory of the National Standardization Laboratory (OMH) according to ISO17025 standard. The thermoluminescent (TL) method for personal dosimetry purposes was introduced in Hungary in the early 1970's. Central Research Insitute of Physics and Insitute of Isotopes developed together a solid state dosimetry system using first 2 pieces of LiF (TLD-100) TL dosimeters in the same badge together with the film. Later, the Harshaw LiF dosimeters were changed to the Polish LiF (MTS-N) ones, having higher sensitivity to gamma and to mixed neutron-gamma field dosimetry purposes. At present, besides the national film dosimetry service, there are three TL dosimetry services as well (Atomic Energy Research Institute, Institute of Isotopes, Nuclear Power Plant). The thermoluminescent (TL) whole body dosimeters are used for individual monitoring parallel with the film and the evaluation of the various types of LiF (TLD-100, Polish MTS-N etc.) is performed at ''home'' dosimetry services using different manual and automatic TL readers (Harshaw 4000, Harshaw 3500, Alnor TLD reader). Personal dosimetry data measured by film and TL method are regularly compared. In addition to the successful applications of various TL dosimeters for work place monitoiring, much effort was devoted to TL research. Al2O3:Mg,Y ceramic TL dosimeters were developed at the Institute of Isotopes for accidental and high dose dosimetry purposes (Hungarian Patent). The application of Al2O3:Mg,Y dosimeters was extended to high temperatures too. A series of TLD systems has been developed and manufactured for spacecraft. The system consists of a set of bulb dosimeters and a small compact TLD reader suitable for an on-board evaluation. The thermal neutron sensitivity of the newly developed lithium-tetraborate LTB (Li2B4O7) single crystal is about 5 times lower than that of TLD-100. The great difference of relative neutron sensitivities between the undoped LTB and doped lithium-tetraborate (LTB:Cu) single crystal dosimeters suggests the application of paired LTB and LTB:Cu for obtaining information about the neutron dose in a mixed-field. (author)
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Krajcar Bronic, I.; Kopjar, N.; Milic, M.; Branica, G; 558 p; ISBN 978-953-96133-7-0; ; 2011; p. 77-81; 8. Symposium of the Croatian Radiation Protection Association; Krk (Croatia); 13-15 Apr 2011; 7 refs., 2 tabs., 2 figs.
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