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Model for determination of protective shielding needed for diagnostic radiology rooms (in Portuguese)
Author(s) -
Costa Paulo R.
Publication year - 2000
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.599041
Subject(s) - electromagnetic shielding , attenuation , radiography , radiation protection , spectral line , radiation , computer science , medical physics , computational physics , nuclear medicine , optics , physics , medicine , nuclear physics , quantum mechanics , astronomy
The objective of the research was the development and evaluation using modern techniques to calculate radiation protection barriers in clinical radiographic facilities. Our methodology uses realistic primary and scattered spectra. The primary spectra were computer simulated using a wave form generalization and a semiempirical model (the TBC model). The scattered spectra were obtained from published data. An analytical function was used to produce attenuation curves from polychromatic radiation for specified kV p , wave form, and filtration. The results of this analytical function are given in ambient dose equivalent units. The attenuation curves were obtained by application of Archer's model to the computer simulation data. We determined the parameters that gave the best fit to our model using primary and secondary radiation data from different radiographic procedures. These resulted in an optimized model for the shielding calculation for any radiographic room. The method was used to determine the shielding needed for two different radiographic room designs using typical workloads and spectra. The shielding costs were about 50% lower than those calculated using the traditional calculation based on NCRP Report No. 49.