Investigations of surface coatings to reduce memory effect in plastic scintillator detectors used for radioxenon detection
2011 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 656, no 1, 84-91 p.Article in journal (Refereed) Published
In this work Al(2)O(3) and SiO(2) coatings are tested as Xe diffusion barriers on plastic scintillator substrates. The motivation is improved beta-gamma coincidence detection systems, used to measure atmospheric radioxenon within the verification regime of the Comprehensive Nuclear-Test-Ban Treaty. One major drawback with the current setup of these systems is that the radioxenon tends to diffuse into the plastic scintillator material responsible for the beta detection, resulting in an unwanted memory effect. Here, coatings with thicknesses between 20 and 900 nm have been deposited onto plastic scintillators, and investigated using two different experimental techniques. The results show that all tested coatings reduce the Xe diffusion into the plastic. The reduction is observed to increase with coating thickness for both coating materials. The 425 nm Al(2)O(3) coating is the most successful one, presenting a diffusion reduction of a factor 100, compared to uncoated plastic. In terms of memory effect reduction this coating is thus a viable solution to the problem in question.
Place, publisher, year, edition, pages
2011. Vol. 656, no 1, 84-91 p.
Radioxenon, Gas diffusion barrier, Plastic scintillator, Comprehensive Nuclear-Test-Ban Treaty, Atomic layer deposition, Plasma enhanced chemical vapor deposition
Natural Sciences Inorganic Chemistry
Research subject Chemistry with specialization in Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-161431DOI: 10.1016/j.nima.2011.07.038ISI: 000296129100011OAI: oai:DiVA.org:uu-161431DiVA: diva2:457023