TUTCRIS - Tampereen teknillinen yliopisto


Radioluminescence of Alpha-Particle Excited Gases in Deep Ultraviolet Regime

Tutkimustuotos: Konferenssiesitys, posteri tai abstrakti


TilaJulkaistu - 17 toukokuuta 2016
TapahtumaOptics and Photonics days - Hotel Torni , Tampere, Suomi
Kesto: 16 toukokuuta 201618 toukokuuta 2016


ConferenceOptics and Photonics days


Alpha emitting radiation sources are hard to detect due to the short range of alpha particles in air. A remote detection of alpha radiation in air is possible by measuring ionization-induced luminescence of air molecules [1]. Alpha-induced ultraviolet (UV) light is mainly emitted by molecular nitrogen (N2) and its luminescence properties are well known. The benefit of this method comes with the long range of UV-photons in air. However, alpha-induced luminescence of N2 is typically weak compared to the solar background lighting, which makes special discrimination methods necessary [2].To develop applications for daylight conditions, the weak but detectable alpha-induced radiolumines-cence signal in the solarblind region (Lambda<300nm) has been studied. In order to achieve maximal signal intensity the radioluminescence is studied in various gas mixtures of N2, O2 and Ar.Finally, applicability of the method under normal daylight conditions is discussed. Enhancement of the solarblind transitions by active probing using pulsed laser excitation can help to circumvent the prob-lem of the background lighting.1.F. Lamadie et al., “Remote Alpha Imaging in Nuclear Installations: New Results and Prospects,” IEEE Transactions on Nuclear Science 52, 3035-3039, 20052.J. Sand, S. Ihantola, K. Peräjärvi, “Radioluminescence yield of alpha particles in air” New Journal of Physics 16, 053022, 2014