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|Title:||Stand-Off Radioluminescence Mapping of Alpha Emitters Under Bright Lighting|
|Authors:||SAND Johan; NICHOLL Adrian; HRNECEK Erich; TOIVONEN H.; TOIVONEN Juha; PERÄJÄRVI K.|
|Citation:||IEEE TRANSACTIONS ON NUCLEAR SCIENCE vol. 63 no. 3 p. 1777 - 1783|
|Publisher:||IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC|
|Type:||Articles in periodicals and books|
|Abstract:||Remote detection of alpha emitters is achieved by measuring the secondary radioluminescence light (air fluorescence) that is induced by alpha particles when absorbed in air. A telescope was used to collect the radioluminescence photons to a photomultiplier tube, which is operated in the photon counting mode. Careful matching of photocathode response and filter passband allows the sensing of a faint radioluminescence emission in a brightly illuminated environment, which is essential for operative use. A minimum detectable alpha activity of 4 kBq was reached at 1 m distance in 10 s time, when ultraviolet-free lighting is present, and 800 kBq under bright fluorescent lighting. These sensitivities are realized using an ultra-bialkali and cesiumtelluride photocathodes in the aforementioned environments respectively. The presented approach is a robust and affordable solution to remotely detect and localize moderate alpha activities in a field environment, providing a means for automated alpha contamination mapping. Moreover, it is shown that a signal increase of more than two orders of magnitude (150–420) can be achieved in deep ultraviolet (close to 260 nm), if nitrogen or argon purge are used to enhance the detection.|
|JRC Directorate:||Nuclear Safety and Security|
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