2) In a nuclear medicine session, 131I is administered intravenously and accumulates in the thyroid. The initial source strength is 1010 Bq/g of iodine. The figure below shows the geometry of the thyroid and the surrounding neck during the session. The thyroid is a point object and is completely filled with 131I. A radiation detector is placed at the surface of the neck tissue in front of the thyroid. 131I has a half-life of 20.3 hours and emits beta particles at 606 keV and gamma rays at 364 keV. For simplicity, assume that 50% of radioactive decay events emit beta particles and 50% emit gamma rays. Compute the intensity, in units of W/cm², of gamma radiation reaching the detector. Assume the thyroid contains 10 g of iodine. Perform the computation at 0 hours and 20.3 hours after source administration. You may neglect the effects of attenuation. 1cm Thyroid Detector Tissue