title: [Biological cycle of radionuclides and dynamics of cattle leukemia in the Orenburg region].
abstract: Global technogenic radionuclides pollution of environment, migration of radionuclides from soil into animal feeds stimulate additional contamination doses. Concentration of natural and of technogenic radionuclides in the investigated objects was determined as result of radiochemical and radiometric studies. It was established that maximum concentrations of 40K, 232Th, 226Ra (Bk/kg) radionuclides in the soil of the eastern zone was 391.6 +/- 77.64; 20.8 +/- 0.71; 16.7 +/- 0.8 (respectively) without exceeding permissable levels. It is also found that the density of soil pollution with 137Cs in the western zone is 0.28 +/- 0.075 mBk/m2 (76.8 +/- 20.4 mKi/km2), such soils are to be considered as locally polluted soils. The number of cattle infected with cattle leucosis is obviously higher in ecologically unsafe areas: 19.3% on the western farms, 12.95% in the central areas and 9.70% on the farms of the eastern zone. Long-term exposure to ecologically unsafe conditions may lead to the reduction of populations immune status expressed in lower disease resistance and in incidence of carcinogenic pathology.
authors.forename: I S
authors.initials: IS
authors.lastname: Ponomareva
mesh_terms: D000821:Animal Feed / Q000032:analysis / Q000592:standards; D000818:Animals; D002417:Cattle; D003627:Data Interpretation, Statistical; D016583:Enzootic Bovine Leukosis / Q000453:epidemiology / Q000209:etiology*; D001909:Leukemia Virus, Bovine / Q000302:isolation & purification; D011834:Radiation Monitoring / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis* / Q000633:toxicity; D012426:Russia / Q000453:epidemiology; D012990:Soil Pollutants, Radioactive / Q000032:analysis* / Q000633:toxicity
chemical_list: D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive