Abstract
Alpha emitting radiation sources are typically hard to detect due to the short range of alpha particles in air (4cm). A remote detection of alpha radiation in air is possible by imaging the ionization-induced fluorescence (radioluminescence) of air molecules [1]. The alpha-induced ultraviolet light is mainly emitted by molecular nitrogen as fluorescent light with wavelengths in the regime of 297–405 nm. The main benefit of this method is the long range of UV-photons in air, which allows for remote detection of alpha emitting radiation sources. However, in many applications background lighting caused by sunlight with a spectrum reaching down to ~300 nm makes the fluorescence signal difficult to isolate [2]. Under environmental conditions radioluminescence in wavelength regimes <300 nm (the solar blind spectral region) by molecules other than N2 is not detectable.
© 2017 IEEE
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