Determination of the ~(137)Cs and ~(90)Sr radioisotope activity concentrations found in digestive organs of sheep fed with different feeds

摘要

In this study, 12 weanling lambs were fed for 6 months at the Vetenary Control and Research Institute of Elazig in Turkey. Sheep were divided into two groups according to feeding type. Each group of sheep was fed a different amount of feed. The activity concentrations of ~(137)Cs and ~(90)Sr were determined in rumen, small intestine and large intestine tissue samples of sheep fed various feeds and quantities. Transfer coefficients and concentration ratios were estimated. The highest average ~(137)Cs and ~(90)Sr activity concentrations were 82 ± 22 Bq kg~(-1) fw in the straw group small intestine sample and 74 ± 9.0 Bq kg~(-1) fw in the fresh lucerne group rumen sample, respectively. Radioactivity levels for ~(137)Cs and ~(90)Sr are under the maximum permitted radioactive pollution level for all the samples. The transfer coefficient of ~(137)Cs and ~(90)Sr in the samples of sheep ranged from 1.0 × 10~(-1) to 2.1 × 10~0 d kg~(-1) and 1.7 × 10~(-1) to 2.3 × 10~0 d kg~(-1), respectively. Calculated transfer coefficients of ~(90)Sr and ~(137)Cs in the samples of sheep were higher than the expected values. Geometric means of F_f and CR for ~(137)Cs were maximum in the fresh lucerne group large intestine sample. Geometric means of F_f and CR for ~(90)Sr were maximum in the fresh lucerne group small intestine sample.