Evaluation of permissible level of soluble I-131 containing fission products for design of protective measures in livestock industry

Among soluble radioactive products of uranium nuclear fission entering a body iodine radioisotopes are the main radiation hazards. The impact selectively accumulated by thyroid on depends absorbed dose to gland, they can cause hypothyroidism or athyreosis. Athyreosis non-radiation origin is characterized metabolism decline, fatigue, bradycardia, cessation hair growth, roughness skin, alopecia, reduced animal productivity with increased fat deposition and possible death embryos in initial stages pregnancy. Therefore veterinary service has opportunity time arrange necessary activities order minimize adverse byproducts dairy cattle territories contaminated radionuclides. Thyroid irradiation at 100 Gy does not impairment cows reproductive traits. animals bring full-fledged offspring, their further use should be decided after examination service. Irradiation gland heifers 30 resulted phase changes hormone levels. Subsequent studies hormonal status demonstrated recovery trend. No immunological reactivity were observed animals. It was found that below did disturbance This cow registered introduction 333 MBq I-131. activity corresponds 5,000 MBq/animal different during 10-hours fission. Similar safe doses obtained an experiment lactating cows, received 6,475 MBq/animal. If contribution total known, it assess appropriateness start grazing soon accident.