Estimation of radiation dose of emergency exposure during the hospitalized 131I therapy patient

Background : The aim of the study was to esmate the radiaon do se during emergency exposure to paents treated with iodine-131 during the isolaon period. Materials and Methods : The dose rate from a sample of 192 paents administrated by three different radioacvity of 131 I (3.7, 5.55 and 7.4 GBq) was measured, at 1 meter a+er 1, 24 and 48 hours po st dose administraon, at three different levels from the paent body (thyroid glands, abdomen and knee). The average of decay curve of the measured radiaon dose rate was plo.ed and their values were fi.ed. The medical emer gency exposure was esmated in the form of an equaon to take into acc ount the duraon and the posion of the intervenon. Results: The esmated radiaon doses received during 10 minutes of intervenon emergency at a distance of 20, 40 and 60 cm from paent a+er differentmes post dose administraon were in the range of 72.2 to 1207.5, 18.1 to 301.9 and 8.0 to 134.2 µSv, respecvely. Conclusion: During the first ten hours following paent dose administraon, the esmated emergency dose could be considered as high occupaonal dose value compared to the dose limit recommended by ICRP.