In treatment of papillary carcinomas thyroid, radioiodine destroys the neoplastic cells predominantly by:: (A) X-rays, (B) Beta rays, (C) Gamma rays, (D) Alpha particles
Answer is B. Ans. (b) Beta raysRef: Schwartz 10th edition, Page 1546* I-131 emits Beta radiation and penetrates the thyroid tissue up to 0.5mm without damaging the adjacent structures like parathyroid.