کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5493468 1526286 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-resolution gamma-ray spectrometry for an information barrier based on a multi-criteria template-matching approach
ترجمه فارسی عنوان
طیف سنجی گامای اشعه با وضوح پایین برای یک مانع اطلاعات مبتنی بر یک رویکرد تطبیق چند معیار الگو
کلمات کلیدی
طیف سنج گاما، مانع اطلاعات رویکرد الگو، تأیید کلاهک هسته ای، خلع سلاح هسته ای، کنترل تسلیحات هسته ای، تجزیه و تحلیل فعال سازی گاما سریع،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
چکیده انگلیسی
Gamma-ray spectrometry has been successfully employed to identify unique items containing special nuclear materials. Template information barriers have been developed in the past to confirm items as warheads by comparing their gamma signature to the signature of true warheads. Their development has, however, not been fully transparent, and they may not be sensitive to some relevant evasion scenarios. We develop a fully open template information barrier concept, based on low-resolution measurements, which, by design, reduces the extent of revealed sensitive information. The concept is based on three signatures of an item to be compared to a recorded template. The similarity of the spectrum is assessed by a modification of the Kolmogorov-Smirnov test to confirm the isotopic composition. The total gamma count rate must agree with the template as a measure of the projected surface of the object. In order to detect the diversion of fissile material from the interior of an item, a polyethylene mask is placed in front of the detector. Neutrons from spontaneous and induced fission events in the item produce 2.223 MeV gamma rays from neutron capture by hydrogen-1 in the mask. This peak is detected and its intensity scales with the item's fissile mass. The analysis based on MCNP Monte Carlo simulations of various plutonium configurations suggests that this concept can distinguish a valid item from a variety of invalid ones. The concept intentionally avoids any assumptions about specific spectral features, such as looking for specific gamma peaks of specific isotopes, thereby facilitating a fully unclassified discussion. By making all aspects public and allowing interested participants to contribute to the development and benchmarking, we enable a more open and inclusive discourse on this matter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 840, 21 December 2016, Pages 139-144
نویسندگان
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