Question

A patient with hyperthyroidism is estimated to a have a thyroid gland with a mass of 65 g. This patient is given a 740 MBq dose of sodium iodide orally. Assuming an RBE of 1.4 for the beta particles, determine the equivalent dose in the thyroid gland in milli-sievert, mSv.
A. 1.6 mSv
B. 0.17 mSv
C. 0.35 mSv
D. 0.49 mSv
E. 0.24 mSv

Answer 1

the equivalent dose in the thyroid gland = (2 * mass * RBE)/(dose of sodium)

                                                                 = (2 * 65 * 1.4)/740

                                                                =   0.24 mSv