Evaluation of the X-ray dose absorbed by patients and professionals due to the radiation scattered by the shield of a radiological room

The present work had intention to evaluate the dose and to analyze the specter of the radiation that would be received by professionals from the area and patients gifts in the room and the specters from beams from X-rays spread by the shield from the walls from a radiological room, during the expositions. The results indicate that the scattering is not uniform in the measured directions. Peaks in the specters of which had spread beams to the fluorescence of X-rays had been observed emitted by the material of the shield (baryta). This characteristic radiation significantly increases Kerma in the air of such beams. Through the determination of the equivalent of surrounding dose, it was verified that any situated person inside of the analyzed radiological room in superior exposition about 1 minute daily in the period of one year for the tension of 100 kV, surpasses the level of occupational reference of dose per year (20mSv). On the basis of the results, are recommendable a deepened study of composites currently used in the shields of the radiological rooms, with the purpose to diminish the fluorescence, increasing the absorption of radiation X in the radio diagnostic band. (author)