Assessment of medical radiation exposure to patients and ambient doses in several diagnostic radiology departments

摘要

In many countries diagnostic medical exposures typically account for a very large fraction of the collective effective dose that can be assigned to anthropological sources and activities. This in part flags up the question of whether sufficient steps are being taken in regard to potential dose saving from such medical services. As a first step, one needs to survey doses to compare against those of best practice. The present study has sought evaluation of the radiation protection status and patient doses for certain key radiological procedures in four film-based radiology departments within Sudan. The radiation exposure survey, carried out using a survey meter and quality control test tools, involved a total of 299 patients their examinations being carried out at one or other of these four departments. The entrance surface air kerma (ESAK) was determined from exposure settings using DosCal software and an Unfors-Xi-meter. The mean ESAK for x-ray examination of the chest was 0.30 +/- 0.1 mGy, for the skull it was 0.96 +/- 0.7 mGy, for the abdomen 0.85 +/- 0.01 mGy, for spinal procedures 1.30 +/- 0.6 mGy and for procedures involving the limbs it was 0.43 +/- 0.3 mGy. Ambient dose-rates in the reception area, at the closed door of the x-ray room, recorded instantaneous values of up to 100 pSv/h. In regard to protection, the associated levels were found to be acceptable in three of the four departments, corrective action being required for one department, regular quality control also being recommended.