What dose equivalent in will the gland receive in the first hour?

131 I undergoes beta-minus decay with a subsequent gamma emission from the daughter nucleus. Iodine in the body is almost entirely taken up by the thyroid gland, so a gamma scan using this isotope will show a bright area corresponding to the thyroid gland with the surrounding tissue appearing dark. Because the isotope is concentrated in the gland, so is the radiation dose, most of which results from the beta emission. In a typical procedure, a patient receives 0.050 mCi of 131 I. ume that all of the iodine is absorbed by the 0.15 kg thyroid gland. Each 131 I decay produces a 0.97 MeV beta particle. ume that half the energy of each beta particle is deposited in the gland.