National Academy of Medical Sciences of Ukraine
State Institution "The National Research Center for Radiation Medicine"

ISSN 2313-4607 (Online)
ISSN 2304-8336 (Print)

Problems of Radiation Medicine and Radiobiology



L. L. Stadnyk, O. V. Nosyk

SI źInstitute of Medical Radiology named by S.P. Grigoriev National Academy of Medical Sciences of Ukraine╗, 82 Pushkinska St., Kharkiv, 61024, Ukraine


Objective. The objective of investigation is the determination of conversion factors from measured dosimetric values to equivalent organ / tissue doses by phantom modeling of the exposure conditions and assessment the effective doses of the źstandard╗ patient for the most common types of radiographic examinations in Ukraine.
Materials and methods. The simulation of patientsĺ exposure for 7 most common types of radiographic exams and fluorography in Ukraine was carried out on a heterogeneous anthropomorphic phantom of a źstandard╗ person. For phantom modeling two groups of X-ray units (modern digital and analogue units which have been in use for more than 15 years) were used. The measurements of entrance surface and absorbed doses in organs and tissues were performed using thermoluminescent dosimetry method.
Results. The conversional factors from the entrance surface doses (ESDs) to the equivalent doses for most radiosensitive organs / tissues of the źstandard╗ patient were determined for the selected types of radiographic exams from the results of phantom simulations. The estimation of conversional factors from the ESDs to the effective doses was carried out in the working range of voltage values of two groups of X-ray units for the same radiographic examinations. A total of 116 phantom simulations were performed with 2ľ3 measurement repetitions for each irradiation model on each X-ray unit.
Conclusions. The obtained values of conversion factors from ESD to the patientsĺ effective doses for selected types of X-ray diagnostic exams can be used for assessing the effective doses of źstandard╗ patients in the various X-ray rooms and for assessing the collective doses and radiation risks of the population of Ukraine due to the most common radiographic examinations.
Key words: radiography, phantom simulation, conversion factors, equivalent and effective doses.

Problems of Radiation Medicine and Radiobiology.
2019;24:180-194. doi: 10.33145/2304-8336-2019-24-180-194

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