BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Current Tendencies in the Development of Neutron and X-ray (Gamma) Detectors for Common Use DTSTART;VALUE=DATE-TIME:20161014T080000Z DTEND;VALUE=DATE-TIME:20161014T083000Z DTSTAMP;VALUE=DATE-TIME:20260713T091938Z UID:indico-contribution-709@cern.ch DESCRIPTION:Speakers: Vitalii Mikerov (NRNU MEPhI\, FSUE VNIIA)\nThe paper is a brief review of activities of National Research Nuclear University “MEPhI”\, and Federal State Unitary Enterprise “VNIIA” in the deve lopment of radiation detectors for common use. It describes design and ope rating characteristics of the following neutron and X-ray (Gamma) detector s.\n\n1) Radiographic detectors for imaging X-rays and neutrons [1-9]:\n\n - detectors for fast neutron radiography with a cone beam\;\n- detector fo r simultaneous imaging fast neutrons and X-rays\;\n- detector for pulsed r adiography with a plasma focus generator.\n\n2) Segmented 3-D arrays of sc intillation detectors [10].\nThe 3-D array of scintillation detectors is a three dimensionally configured system consisting of scintillation element s coupled with photoreceivers and front-end electronics. The considered co ncept of highly segmented 3-D arrays of scintillation detectors is based o n the application of crossed wavelength shifting (WLS) fibers reading out scintillation bursts generated in scintillation elements. The scintillatio n location (corresponding scintillation element) is being fixed by the int ersection point of two crossed WLS fibers generating optical signals at th eir ends practically at the same time. The application of the crossed WLF fibers enables the large volume 3-D arrays design. One of the most importa nt features of 3-D arrays is the capability of radiation source detection and imaging. At that 3-D arrays allow to:\n\n- identify the radiation sour ce\;\n- determine the source position\;\n- measure the source activity\;\n - discriminate neutrons and gamma rays in mixed radiation fields\;\n- reje ct background\, and to improve sensitivity of interrogation systems.\n\n3) Multi-energy X-ray sensors [11].\nThe operation of the described multi-en ergy sensor (MES) is based on the relationship between the spatial distrib ution of scintillation signal generated in a scintillation plate\, stretch ed along the radiation beam\, and the radiation spectrum. For that\, the s cintillation plate consists of a number of scintillators placed one after another with effective atomic charge increasing along the plate.The scinti llators and their sequence are chosen in such a way that the radiation hit ting any scintillator does not contain X ray quanta with the energy corres ponding to the K-edge of the photo-absorption band and to the production o f electron-positron pairs in this scintillator. MES can be used to measure X-ray energy distribution in the range of 15 keV-1 MeV.\n\n4) Position se nsitive detectors for well logging devices [12].\nPosition sensitive detec tors have been invented for registering spatial distribution of both neutr ons and gammas in a well while well logging. They consist of cylinder-shap ed coaxial arrays of elongated scintillators. The opposite ends of each sc intillator are connected to two photoreceivers. The arrays each provides r egistering a specific radiation. The scintillator type in an array and arr ays positional relationship are accordingly chosen to register different r adiation at the same time. Detectors axial resolution is supported by the amplitude comparison of two scintillation signals received by photoreceive rs. Detectors azimutal resolution is privided by arrays segmention. Measur ements of neutron and gamma spatial distributions provide more precise com puting formation density and porosity\, fixing the boring tool position in regard to the formation boundaries\, as well.\n\n5) Neutron electrometric al sensors [13].\nNeutron electrometric sensors (NES) are based on accumul ating electric charge when irradiated by neutrons. They contain the emitte r and the absorber of charged particles. The absorbed charge can be measur ed in a variety of ways using\, for example: the frequency of the emitter and the absorber electric locking\, their displacement\, the deformation o f the elastic element (in the presence)\, electric field strength in the g ap between the emitter and the absorber. NES may be used\, for example\, i n control systems of nuclear reactors and subcritical assemblies\, for mea suring pulsed neutron flux\, in scientific investigations\, as well.\n\n## References ##\n\n1. V.I. Mikerov\, A.P. Koshelev\, O.V. Ozerov\, A.S. Svi ridov\, and D.I. Yurkov\, Two Dimensional and Linear Scintillation Detecto rs for Fast Neutron Imaging – Comparative Analysis\, 2014 JINST 9 C05003 .\n\n2. E. Bogolubov\, A. Koshelev\, V. Mikerov\, An Estimation of Efficie ncy and Spatial Resolution of Radographic Detectors for Fast Neutrons\, Nu clear Physics and Engineering\, Vol. 1\, #4 (2010) 319-325 (in Russian).\n \n3. Yu.N. Barmakov\, E.P. Bogolubov\, V.I. Mikerov\, G.A. Smirnov\, Neutr on Radiography on the basis of Generator Sources\, Nuclear Physics and Eng ineering\, Vol. 1\, #1 (2010) 61-69 (in Russian).\n\n4. E.P. Bogolubov\, M .V. Koltunov\, B.D. Lemeshko\, V.I. Mikerov et al.\, Application of a Plas ma Focus-based Source for Fast Neutron and X-ray Radiography\, NIM A 605 ( 2009) 62–64.\n\n5. V. Mikerov\, E. Bogolubov\, V. Samosyuk\, S. Verushki n\, Fast Neutron Imaging with CCD Detectors and Imaging Plates\, POS (FNDA 2006) 007.\n\n6. V. Mikerov\, V. Samosyuk\, S. Verushkin\, Detectors Based on Imaging Plates for Fast Neutron Radiography\, NIM A 542 (2005) 192–1 96.\n\n7. E. Bogolubov\, O. Bugaenko\, S. Kuzin\, V. Mikerov et al.\, CCD Detectors for Fast Neutron Radiography and Tomography with a Cone Beam\, N IM A 542 (2005) 187–191.\n\n8. Yu. Barmakov\, E. Bogolubov\, A .Koshelev \, V. Mikerov\, V. Ryzhkov\, Detection Quantum Efficiency and Spatial Reso lution of Neutron CCD-detectors\, NIM B 213 (2004) 241-245.\n\n9. V. Miker ov\, I. Zhitnik\, A. Ignat’ev et al.\, Neutron Tomography with High Spat ial Resolution\, Physica Scripta 57 (1995) 190-195.\n\n10. E. Bogolubov\, A. Koshelev\, V. Mikerov\, and A. Sviridov\, Specific Features of 3-D Dete ction Arrays of Plastic Scintillators\, NIM A 652 (2011) 99-102.\n\n11. V. Mikerov\, A. Koshelev\, O. Ozerov\, A. Sviridov\, and D. Yurkov\, Multi-E nergy X-ray Sensors Based on Pixilated Scintillators - Conceptual Study\, IEEE Transactions on Nuclear Science\, Vol. 60\, Issue 2 (2013) 963-967.\n \n12. Patents RF for invention: # 2574322\, # 2574323\, # 2574415\, # 2574 416\; patent RF for utility model # 153278.\n\n13. E. Bogolubov\, A. Koshe lev\, V. Mikerov\, and A. Sviridov\, Electrometric Sensors for Neutron Rad iation: Conceptual Study\, 2012 JINST 7 C03026.\n\nhttps://indico.particle .mephi.ru/event/4/contributions/709/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/709/ END:VEVENT END:VCALENDAR