Using ALISA for high-speed classification of the components and their concentrations in mixtures of radioisotopes

David Portnoy; Peter Bock; Peter C. Heimberg; Eric T. Moore

doi:10.1117/12.555833

26 October 2004 Using ALISA for high-speed classification of the components and their concentrations in mixtures of radioisotopes

David Portnoy, Peter Bock, Peter C. Heimberg, Eric T. Moore

Author Affiliations +

Proceedings Volume 5541, Penetrating Radiation Systems and Applications VI; (2004) https://doi.org/10.1117/12.555833
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

An ALISA Vector Module (AVM) is trained on the discrete gamma-ray emission spectra of 61 commonly occurring radioisotopes generated by an analytical model. The trained AVM is then used to decompose the spectra captured from actual sources in the field using low-resolution thallium-activated sodium-iodide (NaI) detectors and/or high-resolution high-purity germanium (HPGe) detectors using QR Factorization to find the optimal least-squares solution for an over-specified system of equations, even if inconsistent. For low-resolution NaI detectors, formal experiments conducted under carefully controlled laboratory conditions yield average classification (spectral decomposition) errors less than 6% in mixtures with up to 10 components in test samples consisting of 1,000 photonic events, which requires just a few seconds to obtain in typical situations. Preliminary experiments with the high-resolution HPGe detector yield dramatically smaller errors than with the NaI detector. Further improvements in the accuracy and precision of the training data, as well as fusion with other powerful classification methods, are expected to reduce the error without prohibitively increasing the computation time.

Citation Download Citation

David Portnoy, Peter Bock, Peter C. Heimberg, and Eric T. Moore "Using ALISA for high-speed classification of the components and their concentrations in mixtures of radioisotopes", Proc. SPIE 5541, Penetrating Radiation Systems and Applications VI, (26 October 2004); https://doi.org/10.1117/12.555833

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available