The calibration of a Ge(Li) gamma-ray spectrometer for energy and relative intensity measurements

Abstract

Two aspects of Ge(Li) gamma-ray spectrometry are discussed. The non-linearity of an amplifier-analyzer system was measured using a precision pulser and was checked with gamma-ray standards. The overall accuracy was 2 parts in 104. The relative detection efficiency of gamma-ray full-energy peaks was determined using sources with well measured relative gamma-ray emission rates. Two Ge(Li) detectors with active volumes of 3 cm 2 × 0.5 cm and 4 cm 2 × 0.5 cm were calibrated in the energy range 80-3200 keV. An overall accuracy of 5 % in the energy region from 500-3200 keV and an accuracy of 10% over the entire range was obtained. The relative areas of the single escape peak and double escape peak to the full energy peak as a function of energy are included. The relative intensities of the 569.6, 1063.6 and 1771 keV gamma-rays following the decay of Z°VBi were measured.

The level scheme of 171Tm

“…The resolution of the system was 3.5 keV at 733 keV for the coaxial detector and 3.0 keV at 733 keV for the trapezoidal detector. The non-linearities in the system were accounted for using the method of Donnelly et al 19). This method gives a measure of the non-linearity associated with the entire electronic system.…”

The decay of 140La to levels in 140Ce

“…A detailed description of the calibrations for energy and intensity measurements is given in ref. 22).…”

“…For the purpose of energy determinations, the centroid of the peak area was taken as the definition of the peak position [discussed in ref. 22)]. Gamma-ray energies between 919.5 and 2548.6 keV were determined using the 487.03 and 815.80 keV ?-ray lines in the spectrum for the calibration.…”

Innere Konversion der 161 keV- und 223 keV-Übergänge in133Cs

“…Die Linien der anderen Pdiparate (Refs. [12][13][14][15][16][17]) werden nach dem ,,pair point"-Verfahren nach Donnelly et al [12] in die Kurve eingepagt. Die Megwerte sind in Fig.…”