EPJ Web Conf.
Volume 170, 2018ANIMMA 2017
|Number of page(s)||3|
|Section||Safeguards, homeland security|
|Published online||10 January 2018|
New perspectives for undoped CaF2 scintillator as a threshold activation neutron detector
National Centre for Nuclear Research (NCBJ), Otwock, 05-400 poland
CEA Saclay, LIST, Sensors and Electronic Architectures Laboratory, F-91191 Gif-Sur-Yvette, France.
CAEN S.p.A., Via Vetraia 11, 55049 - Viareggio (LU) – Italy.
University of Padua, Department of Physics and Astronomy, Via Marzolo 8, 35131 Padua - Italy
Published online: 10 January 2018
In this paper we present the prompt photofission neutron detection performance of undoped CaF2 scintillator using Threshold Activation Detection (TAD). The study is carried out in the frame of C-BORD Horizon 2020 project, during which an efficient toolbox for high volume freight non-intrusive inspection (NII) is under development. Technologies for radiation monitoring are the part of the project. Particularly, detection of various radiological threats on country borders plays an important significant role in Homeland Security applications. Detection of illegal transfer of Special Nuclear Material (SNM) - 235U, 233U and 239Pu - is particular due to the potential use for production of nuclear weapon as well as radiological dispersal device (RDD) V known also as a “dirty bomb”. This technique relies on activation of 19F nuclei in the scintillator medium by fast neutrons and registration of high-energy β particles and γ-rays from the decay of reaction products. The radiation from SNM is detected after irradiation in order to avoid detector blinding. Despite the low 19F(n,α)16N or 19F(n,p)19O reaction cross-section, the method could be a good solution for detection of shielded nuclear material. Results obtained with the CaF2 detector were compared with the previous study done for BaF2 and 3He detector. These experimental results were obtained using 252Cf source and 9 MeV Varian Linatron M9 linear accelerator (LINAC). Finally, performance of the prompt neutron detection system based on CaF2 will be validated at Rotterdam Seaport during field trails in 2018.
Key words: photofission / neutron detection / threshold activation detection / TAD / CaF2 / BaF2 / scintillators / fluorine / border monitoring / SNM / nuclear material / uranium / MCNP
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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