High resolution

gamma spectrometry

Gamma Spectrometry is a widely used technique for the qualitative and quantitative determination of radionuclide concentration of gamma emitters in samples in test samples.


The method boasts numerous possible applications: from environmental radioactivity monitoring, to internal contamination control in health physics, to the characterization of materials to be released during the dismantling of a nuclear power plant, in radiochemistry, and to nuclear material controls.


For the determinations of interest, LB Servizi uses only high resolution gamma spectrometric systems consisting of:

  • Screen shield made of an external layer of 10 cm Pb coupled with additional internal shades of cadmium, copper and brass;

  • Germanium detector cooled to about 80 ° K with liquid nitrogen or refrigerant systems;

  • Digital signal acquisition system consisting of preamplifier, high voltage generator, digital signal processor, multichannel memory;

  • Software package dedicated to acquisition, calculation and measurement management.


LB Servizi is able to identify and quantify the presence of radionuclides within all materials that, after proper treatment, return homogeneous samples such as:

  • Biological samples;

  • Industrial samples;

  • waste;

  • effluents;

  • Food matrices;

  • Environmental matrices;

  • Building materials.

The scope includes all radionuclides characterized by emission of gamma photons with energy ranging from 5 keV to 3000 keV.


After receipt at our laboratories, the sample to be tested is prepared by the LB Servizi technicians in order to ensure the homogeneity and the possibility of being transferred to the container selected for analysis by reducing it to qualified geometry. Elements that could cause obvious heterogeneity of the sample are previously removed and measured separately, fractionating, for example, the sample, based on the granulometry or the phases that compose it.


The treatments used to prepare the sample ensure the integral preservation of the analyte: heat treatments, in particular, are carried out at lower temperatures than the evaporation of the analyte being investigated.


The test report issued by LB Servizi collects in a single document:

  • Sample identification data;

  • Reference to the test method used;

  • The test results, and the relative uncertainties indicated by the coverage factor,
    for all radionuclides identified in the sample;

  • The detection limit for interest rate radionuclides that have not been identified
    in the sample.

Download Radiological

Characterization Activities