Gamma-Ray spectrometry with a Ge detector: an importance of instrument function on a new energy calibration method

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Abstract

The instrument function deals with the new scope that the centroid of a normal distribution folded in the instrument function, instead of the position of the peak maximum (the peak position ×p), is the intrinsic position corresponding to the reference energy basing on laser wavelength with the voltage-wavelength conversion factor of 1.239842244 × 10−6 eV m ± 0.3 ppm. Deviation of the measured energy is expressed in terms of the peak index, δpeak(E) = (xpcW)/E - 1, where cW is the apparent channel width in keV/channels. Transition energies measured by HPGe/Ge(Li) detectors include a definite methodology deviation around −700 to −10 ppm in comparison with those measured by a crystal diffraction spectrometer based on the wavelength by an I2-stabilized He-Ne laser, or with theoretical values.

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