Radiation Spectroscopy

In this paper, we study a novel method of radioactive spectrum aquisition called Seeded Localized Averaging (SLA).  SLA provides the ability to reduce noise in the spectrum in real-time.  The abstract of the paper is as follows:

Seeded Localized Averaging (SLA) is a spectrum acquisition method that averages pulse-heights in dynamic windows. SLA sharpens peaks in the acquired spectra. This work investigates the transformation of the original probability density function (PDF) in the process of applying the SLA procedure. We derive an analytical expression for the resulting probability density function after an application of SLA. In addition, we prove the following properties: 1) for symmetric distributions, SLA preserves both the mean and symmetry. 2) for unimodal symmetric distributions, SLA reduces variance, sharpening the distributions peak. Our results are the first to prove these properties, reinforcing past experimental observations. Specifically, our results imply that in the typical case of a spectral peak with Gaussian PDF the full width at half maximum (FWHM) of the transformed peak becomes narrower even with averaging of only two pulse-heights. While the Gaussian shape is no longer preserved, our results include an analytical expression for the resulting distribution. Examples of the transformation of other PDFs are presented.

You can also view a talk on seeded localized averaging.

Papers

Nedialko B. Dimitrov, Valentin T. Jordanov. Probability Density Function Transformation Using Seeded Localized Averaging. IEEE Transactions on Nuclear Science, January 2012, doi:10.1109/TNS.2011.2177861

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