Evaluation of radiation exposure of the worker caring for a patient after application of radionuclide I-131 based on the Monte Carlo method

In the paper using the Monte Carlo method ( code MCNPX) were calculated absorbed doses in organs caregivers, from which thereafter was set the value of the equivalent dose in these organs by appropriate formulas and then effective doses in selected geometries using protective shielding devices. The results show that using of shielding aprons equivalent of 1 mm of lead will reduce the exposure of workers caring for patients after administration of the radionuclide I-131 by about 30%. If the caregiver without protective shielding aprons is located between two patients, the gamma rays will be reduced by about 18% due to averted body of caregiver, while the worker's personal dosimeter located at the chest will register approximately 40% lower value of personal dose equivalent. (author)