Evaluation of effective and equivalent dose derived from veterinary radiology applications using the Monte Carlo method.

The objective of the present study was to evaluate effective dose and equivalent dose values for x-ray equipment operators and the tutors of small animals during veterinary radiology procedures, using simulations via the Monte Carlo method with the heavy ion transport code system and MESH-type phantoms, as described in International Commission on Radiological Protection, Report 145. Scenarios of conventional and dental veterinary radiology were analysed, considering variations in beam incidence angle, tube voltage (kV), and the use or not of backscatter shield accessories. The results demonstrate that the use of the backscatter shield significantly reduces the doses received by the operator and the tutor, in addition to reinforcing the importance of safe practices. Adopting the appropriate parameters, kV and current-time product (mAs), adherence to radiological protection recommendations, and training professionals minimises exposures. All data reinforce the need for good practices; although the dose values are below the limits established in radiological protection, they should not be neglected. In dental radiographs, the absence of the backscatter shield can increase doses by up to 30 times. Thus, strict adherence to radiological protection standards, manufacturer's instructions, and international recommendations is essential for maintaining exposures as low as possible.