Distribution and correlation of the natural radionuclides in a coal mine of the West Macedonia Lignite Center (Greece).

The distribution and correlation of six natural nuclides in the West Macedonia Lignite Center, Northern Greece were studied. Fifty-five samples of lignite, aged from 1.8 to 5 million years, and corresponding steriles, beds of marls, clays and sands alternating with the lignite, were collected perpendicular to the mine benches and measured spectroscopically.

Radiation doses to paediatric patients up to 5 years of age undergoing micturating cystourethrography examinations and its dependence on patient age: a Monte Carlo study.

The effective dose received by children up to 5 years of age from micturating cystourethrography (MCU) examinations was estimated in this study. The MCU examination consisted of 5 radiological views, 2 anteroposterior (AP) and three oblique (OBL) views. Entrance surface doses (ESD) were measured with thermoluminescent dosimeters for 30 children.

Patient effective dose resulting from radiographic examinations.

To assess the risk involved, an attempt was made to calculate the effective dose delivered to patients undergoing radiographic examinations. The examination parameters of 704 radiographs were used to calculate the average effective dose for each one of 40 different types of radiographic examinations and the results were tabulated. A sample of 2571 radiographs representing 1586 patients, obtained over a period of 2 weeks, was used to calculate the dose administered to this group.