The maximum permissible workday dose for occupational exposure to radiation is 18 mrem.A 54-kg laboratory technician absorbs 2.6 mJ of 0.30-MeV gamma rays in a work day.The relative biological effectiveness (RBE)for gamma rays is 1.00.What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage?

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Quizplus · Accepted Answer

The equivalent dosage is the absorbed dose multiplied by the RBE. The absorbed dose is the energy deposited per unit mass, and the RBE is a factor that accounts for the different biological effects of different types of radiation. In this case, the absorbed dose is 2.6 mJ / 54 kg = 48.1 mGy, and the equivalent dosage is 48.1 mGy * 1.00 = 48.1 mSv. The ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage is 48.1 mSv / 18 mSv = 0.27.

The Maximum Permissible Workday Dose for Occupational Exposure to Radiation