Labels:text | screenshot | black | black and white OCR: ulated to The carcinogenic risk factor has been cal rs. The be one per cent per 1Gy (100rad) in 20 ye 's, or even latent period is approximately 10 - 20 ye ted in longer. Occasional cases have been repo irradiated adults. to the Therapeutic sterilising doses of radiation ent of thyroid (for example radiological treatm Graves' laryngeal carcinoma or 1311 treatment o duction; in disease) are not associated with cancer i fact, such patients are liable to develop hypothyroidism.