Exposure Of Other Personnel

The distance from patient to personnel has a strong effect on the absorbed radiation dose. According to the inverse square law, exposure to radiation diminishes with the square of the distance. So, doubling the distance from the source will result in a reduction of exposure by 75%. According to international regulations, no additional safety measures are required if the dose rate is below 0.5 |j,Sv/h. At that rate, the annual dose will remain below 1 mSv (0.5 |j,Sv/h X 40 h X 50 weeks = 1000 |j,Sv = 1 mSv). Except for the surgeon and, possibly, his first assistant, other employees in the operating room will usually be at a distance of more than 1 m from the patient and will fall within this dose rate (Table 2). The radiation dose to the pathologist will also be low compared with that of the surgeon because of only a brief contact with the specimen, and usually after a delay of many hours following operation.

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