Estimating the AmLi Neutron Spectrum from Measured Ring Ratios [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 539.7 Atomic and nuclear physics
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: 14 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268090
• Chủ đề: 1. 07 isotope and radiation sources; 2. 46 instrumentation related to nuclear science and technology; 3. 98 nuclear disarmament, safeguards, and physical protection; 4. Neutron spectra; 5. Radioisotope neutron sources

Tóm tắt

 These are a set of slides on estimating the AmLi neutron spectrum from measured ring ratios. The IAEA uses an AmLi source in the Uranium Neutron Coincidence Collar (UNCL) to verify compliance with nonproliferation treaties. The UNCL requires calibration with known uranium samples. The AmLi spectrum isn?t known well enough to allow simulated calibrations. Alphas lose energy traveling through AmO<
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  particle of unknown size. Energy reduction below Li threshold enhances O contribution. Unknown Li matrix material affects neutron production and thermalization. There is large variation in spectra from each element. Other topics covered include: applications, physics considerations, current spectra, measurement overview, measurement results - variation between sources, simulations, spectra fitting, other simulations, and conclusions.