Abstract
A facility for studying the properties of bottom sediments of water bodies by optical method has been developed. From the obtained curves of dependence of density (I) on time (t) the regularities having the same nature for different radiation sources are revealed. Given the intensity of red and green rays, depending on the time, are almost the same, therefore, the effect of these radiations on the bottom sediments is similar. The curves of intensity (I) versus time (t) are satisfactorily described in the framework of the exponential (cascade-probabilistic) model proposed by the authors. Material irradiated in 2016 is less active than material irradiated in 2018. The reason for this behavior is the partial extinction of microorganisms within two years in containers. The flux of gamma radiation in turn increases the activity of the biomaterial immediately after its irradiation.