Alpha Spectrometry 2015: Paradigm Shift in Nuclear Spectrum Analysis
In this paper by Dr. W. Westmeier and K. Siemon, a paradigm shift in nuclear spectrum analysis is discussed, presenting new programming strategies and incorporating fuzzy logic techniques for improved analysis accuracy. The ALPS software is highlighted for its ability to quantify complex and overlapping peaks, enabling quantitative isotope activities and tracer analysis. Various case examples demonstrate the software's capability in extreme analyses, allowing for the quantitative separation of peaks and precise fitting of complex spectra.
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Presentation Transcript
Alpha spectrometry 2015 A Paradigm Shift in nuclear spectrum analysis Paper By Dr. W. Westmeier, K. Siemon, IEEE Transactions on Nuclear Science, Vol. 59/4 (2012) 1296 New programming strategies : Physics, no Numerology for: - peakshapes - shape of baseline - shape of background - resolution function (no SQRT) - true coincidence losses - ..other Fuzzy logic for: - regioning - height of BGND before and after region - peaksearch - peakfit - repeated fit - various methods (Gauss, AWMI, Sieder, ..) - nuclide assignment - ..other
Alpha spectrometry 2015 -particle spectrometry ALPS software can quantify even very complex and overlapping peaks yields quantitative isotope activities tracer analysis is integrated in the software a very complete library (390 nuclides with 1270 lines) is available
Alpha spectrometry 2015 After our Paradigm Shift extreme analyses became possible Quantitative separation of peaks from239Pu and240Pu
Alpha spectrometry 2015 Quantitative separation of peaks from239Pu and240Pu
Alpha spectrometry 2015 Fit of very complex and overlapping peak multiplett Example: old231Pa source with all its progeny
Alpha spectrometry 2015 Fit of dried drop sample from river water Example: 1l river water preconcentrated to 1 ml, 200 l drops dried on sample plate. 238U and (234U+230Th+226Ra) are found. 238U contents in river is 0.8 Bq/l
Alpha spectrometry 2015 Fit of powdered granite sample, grain size 80 m Example: approx. 1 gram of granite powder was measured in a gridded ionisation chamber for over five days. 238U and232Th progeny is completely quantified
Alpha spectrometry 2015 Fit of filter paper sample from city air at main road Example: 1 dia. filter paper was loaded for 1 day and measured directly after 42h waiting time. 212Bi and212Po are quantified yielding the220Rn (thoron) concentration in the air. Note - coincidences above channel 450
Alpha spectrometry 2015 Fit of ALGADE air sampler filter paper (1 month sampling) Example: filter paper was loaded for 1 month and measured directly with PIPS. 238U and all progeny are quantified - no chemistry, no sample preparation
Alpha spectrometry 2015 Modern -spectrometry can do it all with ALPS High-precision analysis of spectra from thin samples Quantitative data through use of tracer nuclides Separation of peaks that were impossible before Analysis of spectra from thick samples Quantification through calculated efficiency Very simple sample preparation - drying of drop samples - ashing of organic material - grinding of solids
