SNM Neutron Detection Using a Time-gated Synthetic Aperture Hybrid Approach
Title | SNM Neutron Detection Using a Time-gated Synthetic Aperture Hybrid Approach PDF eBook |
Author | Matthew P. Molinar |
Publisher | |
Pages | |
Release | 2013 |
Genre | Computer simulation |
ISBN |
This work focuses on using forward and adjoint transport in a hybrid application of 3-D deterministic (PENTRAN) and Monte Carlo (MCNP5) codes to model a series of neutron detector blocks. These blocks, or “channels, †contain a unique set of moderators with 4 atm He-3 proportional detectors tuned to detect and profile a gross energy spectrum of a passing neutron (SNM) source. Ganging the units together as a large area system enables one to apply time gating the source-detector response to maximize signal to noise responses from a passing source with minimal background; multiple units may be positioned as a collective synthetic aperture detector array to be used as a way of performing real time neutron spectroscopy for detecting special nuclear materials in moving vehicles.
Modern essays
Title | Modern essays PDF eBook |
Author | |
Publisher | |
Pages | 97 |
Release | 1936 |
Genre | |
ISBN |
Neutron Detection
Title | Neutron Detection PDF eBook |
Author | William D. Allen |
Publisher | |
Pages | 0 |
Release | 1969 |
Genre | |
ISBN |
SNM Detection with an Optimized Water Cherenkov Neutron Detector
Title | SNM Detection with an Optimized Water Cherenkov Neutron Detector PDF eBook |
Author | |
Publisher | |
Pages | 6 |
Release | 2012 |
Genre | |
ISBN |
Special Nuclear Material (SNM) can either spontaneously fission or be induced to do so: either case results in neutron emission. For this reason, neutron detection performs a crucial role in the functionality of Radiation Portal Monitoring (RPM) devices. Since neutrons are highly penetrating and difficult to shield, they could potentially be detected escaping even a well-shielded cargo container. If the shielding were sophisticated, detecting escaping neutrons would require a highly efficient detector with close to full solid angle coverage. In 2008, we reported the successful detection of neutrons with a 250 liter (l) gadolinium doped water Cherenkov prototype--a technology that could potentially be employed cost effectively with full solid angle coverage. More recently we have built and tested both 1-kl and 3.5-kl versions, demonstrating that very large, cost effective, non-flammable and environmentally benign neutron detectors can be operated efficiently without being overwhelmed by background. In our paper, we present a new design for a modular system of water-based neutron detectors that could be deployed as a real RPM. The modules contain a number of optimizations that have not previously been combined within a single system. We present simulations of the new system, based on the performance of our previous detectors. These simulations indicate that an optimized system such as is presented here could achieve SNM sensitivity competitive with a large 3He-based system. Moreover, the realization of large, cost effective neutron detectors could, for the first time, enable the detection of multiple neutrons per fission from within a large object such as a cargo container. Such a signal would provide a robust indication of the presence of fissioning material, reducing the frequency of false alarms while increasing sensitivity.
Neutron Detection
Title | Neutron Detection PDF eBook |
Author | William Douglas Allen |
Publisher | |
Pages | 278 |
Release | 1960 |
Genre | Science |
ISBN |
Directional Fast Neutron Detection Using a Time Projection Chamber
Title | Directional Fast Neutron Detection Using a Time Projection Chamber PDF eBook |
Author | |
Publisher | |
Pages | 13 |
Release | 2010 |
Genre | |
ISBN |
Nuclear Medicine: The Requisites
Title | Nuclear Medicine: The Requisites PDF eBook |
Author | Harvey A. Ziessman, MD |
Publisher | Elsevier Health Sciences |
Pages | 466 |
Release | 2013-03-21 |
Genre | Medical |
ISBN | 0323082998 |
Get the essential tools you need to make an accurate diagnosis with Nuclear Medicine: The Requisites! The newest edition of his bestselling volume by Drs. Harvey Ziessman, Janis O'Malley, and James Thrall delivers the conceptual, factual, and interpretive information you need for effective clinical practice in nuclear medicine imaging, as well as for certification and recertification review. Prepare for the written board exam and for clinical practice with critical information on nuclear medicine physics, detection and instrumentation, SPECT and PET imaging, and clinical nuclear medicine imaging. Get the best results from today's most technologically advanced approaches, including hybrid imaging, PET/CT, and SPECT/CT, as well as recent developments in instrumentation, radiopharmaceuticals, and molecular imaging. Clearly visualize the findings you're likely to see in practice and on exams with nearly 200 vibrant new full-color images. Access the fully searchable text and downloadable images online at www.expertconsult.com.