Large area alpha sources with a lip: Integral counting and spectral distortions.

Autor: King L; Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8642, USA., Fitzgerald R; Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8642, USA. Electronic address: ryan.fitzgerald@nist.gov., Tosh RE; Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8642, USA.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2018 Apr; Vol. 134, pp. 376-379. Date of Electronic Publication: 2017 Aug 31.
DOI: 10.1016/j.apradiso.2017.08.030
Abstrakt: The detection efficiency for large area alpha sources with adjustable heights of a raised lip around the edge were measured by 2π gas-filled proportional counter. The variations in low-energy spectral shape were modeled using a Geant4 radiation and charge transport Monte Carlo simulation, to enable extrapolation of the spectrum to zero energy. COMSOL Multiphysics finite-element analysis was used to explore changes in the spectrum gain in the presence of a lip. It qualitatively reproduced an increase in peak height due to an increasing height of the source lip. A spectrum analysis procedure was developed to perform integral counting on sources with a lip. The experimental results were used to validate the model, which was then used to predict the changes in 2π counting efficiency for other source-lip geometries.
(Published by Elsevier Ltd.)
Databáze: MEDLINE
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