<prompt> 36 year old lady was diagnosed with Papillary carcinoma thyroid , total thyroidectomy was done but whole body iodine scan came out to be positive . What should be the next step in management ?Re-explorationRadio-iodine ablationUSG-neckBi-annual follow-up  <response>: Radio Active Iodine Ablation I 131 emits beta- rays 90 and gamma- rays 10 Beta rays are responsible for therapeutic effects Depth of penetration of beta rays -0.5 mmAblates only thyroid, even parathyroids are safe Gamma rays are responsible for side effects Indications of RAI Ablation Elderly Patients Patient with surgical co-morbidities Recurrence after surgery Absolute contraindicationbecause gamma rays are emitted Pregnancy Lactation 