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Authors = Carmelo Marchetta

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15 pages, 10468 KiB  
Article
6LiF Converters for Neutron Detection: Production Procedures and Detector Tests
by Antonio Massara, Simone Amaducci, Luigi Cosentino, Fabio Longhitano, Carmelo Marchetta, Gaetano Elio Poma, Martina Ursino and Paolo Finocchiaro
Instruments 2023, 7(1), 1; https://doi.org/10.3390/instruments7010001 - 23 Dec 2022
Cited by 7 | Viewed by 3145
Abstract
Several methods to detect thermal neutrons make use of the naturally occurring 6Li isotope, as it has a rather high cross-section for neutron capture followed by a decay into an alpha particle and a triton. Due to the high chemical reactivity of [...] Read more.
Several methods to detect thermal neutrons make use of the naturally occurring 6Li isotope, as it has a rather high cross-section for neutron capture followed by a decay into an alpha particle and a triton. Due to the high chemical reactivity of lithium, the use of the stable isotopic salt 6LiF is generally preferred to the pure 6Li. The typical method for depositing thin layers of 6LiF on suitable substrates, therefore creating so-called neutron converters, is evaporation under vacuum. The evaporation technique, as well as a newly developed chemical deposition process, are described along with their benefits and drawbacks, and the results of neutron detection tests performed with the two types of converters coupled to silicon diodes show convenient performances. Full article
(This article belongs to the Special Issue Feature Papers in Instruments 2021–2022)
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22 pages, 11042 KiB  
Article
SiLiF Neutron Counters to Monitor Nuclear Materials in the MICADO Project
by Luigi Cosentino, Quentin Ducasse, Martina Giuffrida, Sergio Lo Meo, Fabio Longhitano, Carmelo Marchetta, Antonio Massara, Alfio Pappalardo, Giuseppe Passaro, Salvatore Russo and Paolo Finocchiaro
Sensors 2021, 21(8), 2630; https://doi.org/10.3390/s21082630 - 8 Apr 2021
Cited by 14 | Viewed by 3282
Abstract
In the framework of the MICADO (Measurement and Instrumentation for Cleaning And Decommissioning Operations) European Union (EU) project, aimed at the full digitization of low- and intermediate-level radioactive waste management, a set of 32 solid state thermal neutron detectors named SiLiF has been [...] Read more.
In the framework of the MICADO (Measurement and Instrumentation for Cleaning And Decommissioning Operations) European Union (EU) project, aimed at the full digitization of low- and intermediate-level radioactive waste management, a set of 32 solid state thermal neutron detectors named SiLiF has been built and characterized. MICADO encompasses a complete active and passive characterization of the radwaste drums with neutrons and gamma rays, followed by a longer-term monitoring phase. The SiLiF detectors are suitable for the monitoring of nuclear materials and can be used around radioactive waste drums possibly containing small quantities of actinides, as well as around spent fuel casks in interim storage or during transportation. Suitable polyethylene moderators can be exploited to better shape the detector response to the expected neutron spectrum, according to Monte Carlo simulations that were performed. These detectors were extensively tested with an AmBe neutron source, and the results show a quite uniform and reproducible behavior. Full article
(This article belongs to the Section Physical Sensors)
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