METHOD OF DOSE RATE MEASUREMENT IN MIXED APPARATUS GAMMA-RADIADION SPECTRUM Russian patent published in 2017 - IPC G01T1/20 

FIELD: agriculture.

SUBSTANCE: invention relates to nuclear engineering, namely to methods of measurement of absorbed dose rate of gamma radiation using scintillation detectors. To measure the dose rate in the mixed apparatus gamma-radiation spectrum, the apparatus shape of the line of energy spectra of reference radiation sources, taken for reference, is calculated, and the position of total radiation absorption peaks in the energy scale of the dosimeter-spectrometer is determined; the dosimeter-spectrometer is calibrated, establishing the linear correspondence between the values of the numbers of the dosimeter-spectrometer channels of the total absorption peaks maximums and photon energies of reference sources of ionizing radiation. Next, the apparatus gamma radiation spectrum of unknown composition is registered, and the total absorption peak corresponding to the maximum value of the gamma-ray energy Emax, is determined in it. According to the reference dependence, the gamma rays energy Emax of the detected peak of total absorption is determined, and the radionuclide corresponding to this energy is identified. Next, the dose rate of photon radiation from the component i with the energy Emax is calculated by means of secondary registration of flux density of the gamma-particles with the energy Emax. After that, for every channel the apparatus spectrum of the detected radionuclide is subtracted from the measured apparatus spectrum of the gamma radiation of unknown composition. The actions are repeated as long as the dose rates of photon radiation from all the components of the mixed apparatus gamma-radiation spectrum will be calculated.

EFFECT: invention reduces the measurement errors of the absorbed and exposure dose rate in the mixed spectrum of gamma radiation.

9 cl, 1 dwg