Advanced alpha spectrum analysis based on the fitting and covariance analysis of dependent variables

The correct handling of statistical uncertainties is crucial especially when unfolding alpha spectra that contain a low number of counts or overlapping peaks from different nuclides. For this purpose, we have developed a new spectrum analysis software package called ADAM, which performs a full covar...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-11, Vol.656 (1), p.55-60
Main Authors: Ihantola, S., Pelikan, A., Pöllänen, R., Toivonen, H.
Format: Article
Language:English
Subjects:
Alpha spectrometry
Covariance
Covariance calculus
Detectors
Fittings
Materials handling
Multiplet fitting
Spectra
Spectrometers
Spectrum analysis
Uncertainty
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Summary:The correct handling of statistical uncertainties is crucial especially when unfolding alpha spectra that contain a low number of counts or overlapping peaks from different nuclides. For this purpose, we have developed a new spectrum analysis software package called ADAM, which performs a full covariance calculus for alpha-particle emitting radionuclides. By analyzing a large number of simulated and measured spectra, the program was proved to give unbiased peak areas and statistically correct uncertainty limits. This applies regardless of the peak areas and the number of unknown parameters during the fitting. In addition, ADAM performs reliable deconvolution for multiplets, which opens the way for the determination of isotope ratios, such as 239Pu/240Pu.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2011.07.005