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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:59 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Applied Nuclear Physics
Title:
Advances in complex gamma-ray spectra analysis
Authors:
R. Suvaila (1), O. Sima (2)
Affiliation:
(1) National Institute for Physics and Nuclear Engineering
(2) University of Bucharest - Faculty of Physics
E-mail
rsuvaila@nipne.ro
Keywords:
Germanium detectors, detection limits, Bayesian inference, Monte Carlo simulation, complex spectra
Abstract:
The gamma ray spectrometry laboratory of the University of Bucharest was designed for the analysis of low-level radioactivity samples. High efficiency shielded HPGe detectors are used. Efficiency calibration is achieved by complementing experimental calibration with Monte Carlo computation carried out using GESPECOR, also applied for the evaluation of coincidence summing corrections. Efficiency transfer method and newly developed response matrix procedure are applied. Low detection and decision limits are challenging, and the method to respond to this situation is presented. Using a blank sample in the same experimental conditions as the actual sample turns out benefic for precise peak subtraction. Procedures for peak finding were developed, which include analysis of the peak area/FWHM ratios, hypergeometric alert, in order to establish confidence limits concerning the actual existence of a certain peak in the spectrum. The method is oriented to numeric solutions rather than developing complex fitting functions that might not be appropriate. Development of a software insuring retrospective predictability and asking for human intervention in controversial situations is in progress.
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