Fig. 2From: Less radiation in a radiology department than at homeBreak-even dose as a function of the local residential radon concentration (line), with the break-even dose defined as the model-based estimate of the personal dose equivalent to be incurred from x-rays that undoes the decrease in radiation dose from natural sources within the hypothetical department. Hp(10) due to external radiation in our department was 0.32 mSv/year, in dwellings 0.88 mSv/year. Ratio of the ventilation rates in the department and dwellings was set to 3. Thecirclerepresents our hospital using the average Dutch radon concentration of 13.5 Bq/m3; thesquare corresponds to the worldwide average of 40 Bq/m3. Computations were done for a full-time job and wearing an apron and thyroid collar with a protection factor of 10 mSv/mSv during all x-ray exposuresBack to article page