engleski

Comparison of different dosimetry system for dose measurements in diagnostic radiology

Pulmonary radiograms are essential in the diagnostics of lung diseases of children and youth. The frontal and lateral chest radiographs represent the basic radiological examination of the thorax. Plain radiographic findings together with the presumptive clinical diagnosis will determine the need for further imaging. Chest radiography represents the majority of radiological examinations. Therefore the contribution of pulmonary radiograms to the exposure of the young population is essential. For evaluation of the children exposure the measurement of the radiation dose during the radiological examination of thoracal organs is needed. The dose measurement on patients in X-ray diagnostics is not easy, because low doses with low and various energies have to be measured. The aim of this study was to compare various thermoluminescent detectors (TLD) and radiophotoluminescent (RPL) glass dosimeters for dose measurements in routine X-ray diagnostic of chest. Doses were measured with dosimeters placed on several points (depending of the type of presumed examination) of the “ baby phantom” and also with the dosimeters placed “ free-in-air” . Irradiations were performed by the Shimadzu X-ray unit and the irradiation conditions selected were that most commonly used for children examinations. The results obtained with different detectors were compared and discussed. Special attention was made to the energy dependence of various dosimeters. Various tissue equivalent LiF detectors and the RPL dosimeters showed good characteristics for the measurements in the X-ray field. The RPL dosimeters have to be applied carefully on the patient because of their size. The results were discussed in radiation protection point of view.

TLD; RPL dosimetry; X-ray diagnostic

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