Method for calibrating radiometric density measuring apparatus

The invention relates to a method for calibrating a radiant device for determining and/or monitoring the density of a medium (6) located in a container (1). The method comprises the following steps preparing a precursor; and calculating according to a formula N/N0-I/I0 = c-[mu] BP1d, and when radioactive radiation passes through the empty container (1), defining the half-value thickness N/N0 to beequal to 0.5; determining a mass attenuation coefficient [mu] B of the empty container (1), wherein [mu] B is the mass attenuation coefficient, [rho] is the density of the container wall material, Dis the distance of radiation propagation or the inner diameter of the container (1), I is the measured radiation intensity, I0 is the transmitted radiation intensity, N is the measured count rate, N0is the count rate of the transmitted radiation; determining a mass attenuation coefficient ([mu] M) based on the measured intensity or count rate of the radioactive radiation after passing through thecontainer (1) when the cali