In this work irradiation scenarios that simulated chest and abdomen examinations involving mobile Xray
equipment in hospitals were modeled with the purpose of calculating conversion coefficient for
effective dose (CCE), normalized to entrance surface dose (ESD), applied to patients and public individuals.
These coefficients can easily be used in this practice. Patients and public individuals were
represented by a pair of anthropomorphic phantoms inserted in the MCNPX 2.7.0 radiation transport
code. One of the phantoms (patient) was irradiated with the direct beam simulating examinations of the
chest and abdomen, each with two fields of irradiation, ideal (IF) and extrapolated (EF). Using the
software SPECGEN X-ray spectra from 60 to 100 kVp at 10 kVp intervals were generated and used in this
work. The other phantom (public individual) was positioned 50e200 cm from the patient. In relation to
the CCE calculated in the patient, the average increase obtained between the irradiation fields was 62.4%
for the chest examinations, and for the same conditions the CCE was calculated for abdomen examinations
and found to be 8.0%. Increasing the distance between public individual and patient, reductions of
up to 81.7% in the CCE in abdomen examinations and 83.4% in chest examinations were observed.
Through the assessment of CCE of these scenarios, it is possible to measure the damages relating to this
practice for both patients and public individuals.