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Type:
Educational Exhibit
Keywords:
Education and training, Radiation safety, Conventional radiography, Thorax, Radiation physics
Authors:
A. Henner1, S. Ilves1, T. Yrjänheikki2; 1Oulu/FI, 2Rovaniemi/FI
DOI:
10.1594/ecr2015/C-1161
Findings and procedure details
The first test setting is shown in figure 1.
and the test results in table 1.
Findings in the distance test were equal to Newton’s Inverse Square Law meaning that the radiation intensity is inversely proportional to the distance from the source (e.g.
Thompson 2006; Carlton Adler 2006)
In the milliampere-second test was found out that the dose of the scattered radiation is directly proportional to the mAs as well as increasing tube voltage increases the scattering radiation and vice versa.
Studying the angle of scattering radiation confirmed the backscatter theory where the photons reflect to the direction from which they came (Fig.
3).
In the direction test it was noticed that the patients’ own body absorbs some of the scattering radiation.
Therefore the most scattering happened to the side of the patient and least at the overhead and below the patient.
Decreasing the field size 30% decreased the scattered radiation by 30-40%.