METHOD OF CALIBRATION AND STABILIZATION OF γ-RADIATION SPECTROMETER PARAMETERS Russian patent published in 2019 - IPC G01T1/40 

FIELD: physics.

SUBSTANCE: use for calibration and stabilization of spectrometer parameters γ-radiation. Summary of invention consists in the fact that calibration and stabilization are performed from the same reference point built in the unit γ-radiation, in form of radionuclide Th²³² with activity of not more than 10³ Bq, procedure is carried out continuously during the entire operation of the detection unit in accordance with specially developed software by cyclic execution of iterations, when performing stabilization, the found position of the highest-energy peak of full absorption of a reference source corresponding to energy of 2,614 keV is monitored, location of which is determined by approximating a portion of the spectrum with a Gauss function, augmented with a linear function for accounting for the background γ-radiation by least-squares method, wherein prior to correcting the gain, performing checking the found peak to validity criteria, which are the minimum area under the approximating curve minus the background and the full width at half height (FWFF) of the approximating curve, where the change in amplification ratio is achieved by matching the peak position with the channel number determined during calibration, after the iteration completion, the next, e amplification factor, which is determined in the previous one with change in the amplification coefficient is started, achieving the position of the peak corresponding to the channel number determined during calibration, when the iteration is completed, the spectrum in the buffer memory area is reset and the next iteration is started with the gain defined in the previous iteration.

EFFECT: automatic correction of the readings of the spectrometric channel of the detection unit γ-radiation under conditions of varying external factors.

1 cl, 2 dwg