Beta particle energy spectra shift due to self-attenuation effects in environmental sources

Alton, Thomas Theakston and David Monk, Stephen and Cheneler, David (2017) Beta particle energy spectra shift due to self-attenuation effects in environmental sources. Nuclear Engineering and Technology, 49 (7). pp. 1483-1488. ISSN 1738-5733

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Abstract

In order to predict and control the environmental and health impacts of ionising radiation in environmental sources such as groundwater, it is necessary to identify the radionuclides present. Beta-emitting radionuclides are frequently identified by measuring their characteristic energy spectra. The present work shows that self-attenuation effects from volume sources result in a geometry-dependent shift in the characteristic spectra which needs to be taken into account in order to correctly identify the radionuclides present. These effects are shown to be compounded due to the subsequent shift in the photon spectra produced by the detector, in this case an inorganic solid scintillator (CaF2:Eu) monitored using a Silicon Photomultiplier (SiPM). Using tritiated water as an environmentally relevant, and notoriously difficult to monitor case study, analytical predictions for the shift in the energy spectra as a function of depth of source have been derived. These predictions have been validated using Geant4 simulations and experimental results measured using bespoke instrumentation.

Item Type:
Journal Article
Journal or Publication Title:
Nuclear Engineering and Technology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2104
Subjects:
ID Code:
86277
Deposited By:
Deposited On:
17 May 2017 08:56
Refereed?:
Yes
Published?:
Published
Last Modified:
03 Jun 2020 03:41