Spectrum Stabilization Method for Aeronautical γ Spectrometer Based on Spectrum Reconstruction Technology

Abstract

The invention discloses a method for stabilizing the spectrum of an airborne gamma energy spectrometer based on energy spectrum reconstruction technology, which is characterized in that the characteristic peaks of incident gamma rays of various energies at different temperatures measured by the NaI gamma energy spectrometer are obtained in the laboratory The peak position relative to the linear relationship between the change rate of the peak position and the temperature of the characteristic peak position corresponding to the energy incident γ-ray at the reference temperature and take it as a reference frame, combined with the energy nonlinear law measured at the reference temperature, will be different The pulse amplitudes generated by incident gamma rays at different energies at different temperatures are corrected to the pulse amplitudes linearly corresponding to the specified energy at the reference temperature; within the set measurement time interval, the corrected pulse amplitudes are classified and counted according to the specified pulse amplitude intervals, and the results are obtained. Energy linear reconstruction of the spectrum. It avoids the problems of inconsistent measurement energy range of each NaIγ energy spectrometer caused by spectral drift, and the inability of a single reference point to stabilize the spectrum of each energy in the full measurement energy range caused by energy nonlinearity and the delay of the stabilization operation.

Description

technical field [0001] The invention relates to research and development technology of airborne energy spectrum exploration instruments, in particular to a spectrum stabilization method for airborne gamma energy spectrometers based on energy spectrum reconstruction technology. Background technique [0002] The essence of aeronautical geophysical prospecting is to use an aircraft as a vehicle to load geophysical detection instruments to complete geophysical information collection in the air. Aeronautical spectroscopy is an airborne geophysical method for obtaining information on the earth's radioactive field. Because at a flying height of 120m, there are very few γ-rays in the small solid angle detection range, and the measurement time interval is short (0.5s or 1s), so the NaI γ-spectrometer with high detection efficiency is used by experts at home and abroad as an aeronautical energy spectrometer. The first choice for exploration equipment - airborne gamma energy spectrome...

AI Technical Summary

Problems solved by technology

However, due to the non-linear and different energy of the NaI probes, only the reference energy peaks in the energy spectra measured by each NaI γ spectrometer will be the same, and the positions of the characteristic peaks before and after the reference energy peak will be shifted to varying degrees. Bits, even large enough to distort the combined spectrum and affect the accuracy of the measurement results

[0004] Although some experts proposed to use the offline multi-energy point nonlinear interpolation spectral drift correction method, only the synthetic spectrum is corrected, ignoring the premise ②, and the stabilization effect is difficult to guarantee

At the same time, the current spectrum stabilization methods are based on the previous measurement results to stabilize the next measurement, which has a delay, and often produces distorted gamma energy spectrum output when the external environmental conditions change drastically.

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