can be assigned to such groups which at present is not understood the importance in the process of metabolism Numerous studies indicate that isotope content This group in plant and animal organisms depends on the isotope concentration in the environment. Therefore, in the ashes of plants grown on ordinary soil, The average uranium content is 3 g/kg. and in the ashes of plants grown on the ground which is enriched with uranium is equal to 103 g/kg. In addition, it should be noted that the relative efficiency