Title: Alpha Radiation-Induced Luminescence by Am-241 in Aqueous Nitric Acid Solution
Authors: KERST THOMASMALMBECK RIKARDBANIK NIDHUTOIVONEN JUHA
Citation: SENSORS vol. 19 no. 7 p. 1602
Publisher: MDPI
Publication Year: 2019
JRC N°: JRC119118
ISSN: 1424-8220 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC119118
DOI: 10.3390/s19071602
Type: Articles in periodicals and books
Abstract: When exposed to air, alpha particles cause the production of light by exciting the molecules surrounding them. This light, the radioluminescence, is indicative of the presence of alpha radiation, thus allowing for the optical sensing of alpha radiation from distances larger than the few centimeters an alpha particle can travel in air. While the mechanics of radioluminescence in air and other gas compositions is relatively well understood, the same cannot be said about the radioluminescence properties of liquids. Better understanding of the radioluminescence properties of liquids is essential to design methods for the detection of radioactively contaminated liquids by optical means. In this article, we provide radioluminescence images of Am-241 dissolved in aqueous nitric acid (HNO3) solution and present the recorded radioluminescence spectrum with a maximum between 350nm and 400nm, and a steep decrease at the short wavelength side of the maximum. The shape of the spectrum resembles a luminescence process rather than Cerenkov light, bremsstrahlung, or other mechanisms with broadband emission. We show that the amount of light produced is about 150 times smaller compared to that of the same amount of Am-241 in air. The light production in the liquid is evenly distributed throughout the sample volume with a slight increase on the surface of the liquid. The radioluminescence intensity is shown to scale linearly with the Am-241 concentration and not be affected by the HNO3 concentration.
JRC Directorate:Nuclear Safety and Security

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