The dependence on averaged time of near-Earth concentration of radionuclides ejected from stacks

Experimental values of relations of near-earth concentration of radionuclides averaged during different periods are given. The analytical form of the concentration dependence on averaged time and necessity of this dependence consideration when determining the meteorological factor of dilution for a radioactive impurity released into the atmosphere from tall sources are discussed. The results obtained may be used when establishing discharge standards of detrimental substances from stacks of enterprises into the atmosphere