PRECISE DETERMINATION OF GE DETECTOR EFFICIENCY CURVE FOR OBTAINING ACTIVITIES IN RADIONUCLIDES GAMMA-EMITTERS

Jose U. Delgado, Maria Cd. M. de Almeida, Roberto Poledna

Abstract

An efficiency curve obtained in a gamma-ray spectrometric system using a high purity germanium detector and radioactive standards of ¹³³Ba, ¹⁵²Eu and ^166mHo in an energy range of 50 to 1400 keV was established for metrological purposes. To do this, the efficiency response of the detector was used considering 29 different energies. This allowed calibrating various gammaemitter radioactive point sources, within of a 50 kBq to 550 MBq activity range, with expanded uncertainties below 2.5% at two-sigma confidence level (<i>k</i>=2). The obtained activity value for ²²Na was validated by sum-peak coincidence method.

Keywords

efficiency curves, gamma-emitters, Ge detector

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DOI

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IMEKO TC

TC7 - Measurement Science

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