Aviation gamma energy disperse spectroscopy spectrum stabilization method based on energy spectrum reconstitution technology

Abstract

The invention discloses an aviation gamma energy disperse spectroscopy spectrum stabilization method based on the energy spectrum reconstitution technology. The aviation gamma energy disperse spectroscopy spectrum stabilization method is characterized in that a linear relation between the change rate of characteristic peak position track addresses, measured by a NaI gamma energy disperse spectroscopy, of energy incidence gamma rays at different temperatures to the characteristic peak position track address of corresponding energy incidence gamma rays at the standard temperature and the temperatures is obtained in an experiment chamber so as to serve as a standard reference system, an energy nonlinearity rule actually measured at the standard temperature is used in a combined mode, and impulse amplitudes generated by the different energy incidence gamma rays at the different temperatures are corrected into impulse amplitudes corresponding to the specific energy linearity at the standard temperature; the corrected impulse amplitudes within a set measurement time interval are counted in a classified mode according to the specific impulse amplitude interval, and reconstitution energy spectra of the energy linearity are obtained. The problems that the NaI gamma energy disperse spectroscopy measurement energy scopes are not coincident due to spectrum shifting, a single reference point cannot conduct spectrum stabilization within a full-measurement energy scope due to energy nonlinearity, and delaying of the spectrum stabilization operation is caused are solved.

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 NaI probes, only the reference energy peaks in the energy spectrum 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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