Some Target Assay Uncertainties for Passive Neutron Coincidence Counting PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
This paper provides some target assay uncertainties for passive neutron coincidence counting of plutonium metal, oxide, mixed oxide, and scrap and waste. The target values are based in part on past user experience and in part on the estimated results from new coincidence counting techniques that are under development. The paper summarizes assay error sources and the new coincidence techniques, and recommends the technique that is likely to yield the lowest assay uncertainty for a given material type. These target assay uncertainties are intended to be useful for NDA instrument selection and assay variance propagation studies for both new and existing facilities. 14 refs., 3 tabs.
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
This paper provides some target assay uncertainties for passive neutron coincidence counting of plutonium metal, oxide, mixed oxide, and scrap and waste. The target values are based in part on past user experience and in part on the estimated results from new coincidence counting techniques that are under development. The paper summarizes assay error sources and the new coincidence techniques, and recommends the technique that is likely to yield the lowest assay uncertainty for a given material type. These target assay uncertainties are intended to be useful for NDA instrument selection and assay variance propagation studies for both new and existing facilities. 14 refs., 3 tabs.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Using passive thermal neutron coincidence counting techniques, the accuracy of nondestructive assays of fertile material can be improved significantly using a two-ring detector. It was shown how the use of a function of the coincidence count rate ring-ratio can provide a detector response rate that is independent of variations in neutron detection efficiency caused by varying sample moderation. Furthermore, the correction for multiplication caused by SF- and (.cap alpha., n)-neutrons is shown to be separable into the product of a function of the effective mass of 24°Pu (plutonium correction) and a function of the (.cap alpha., n) reaction probability (matrix correction). The matrix correction is described by a function of the singles count rate ring-ratio. This correction factor is empirically observed to be identical for any combination of PuO2 powder and matrix materials SiO2 and MgO because of the similar relation of the (.cap alpha., n)-Q value and (.cap alpha., n)-reaction cross section among these matrix nuclei. However the matrix correction expression is expected to be different for matrix materials such as Na, Al, and/or Li. Nevertheless, it should be recognized that for comparison measurements among samples of similar matrix content, it is expected that some function of the singles count rate ring-ratio can be defined to account for variations in the matrix correction due to differences in the intimacy of mixture among the samples. Furthermore the magnitude of this singles count rate ring-ratio serves to identify the contaminant generating the (.cap alpha., n)-neutrons. Such information is useful in process control.
Author: International Atomic Energy Agency Publisher: ISBN: Category : Business & Economics Languages : en Pages : 948
Book Description
Proceedings of a symposium organized in co-operation with ANS, ESARDA, INMM and the Nuclear Society International (Moscow), Vienna, 14-18 March 1994. Presented at this symposium were: the findings in Iraq by the Action Team established under United Nations Security Council resolutions, South Africa's decision to join the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), details of the IAEA-Argentina-Brazil-ABACC Quadripartite Safeguards Agreement, and measures following the break-up of the former USSR into newly independent States. Special emphasis was given to the verification of a State's declaration as well as detection of undeclared activities. In addition to covering recent developments, the symposium considered fundamental changes stemming from converging relationships between nuclear arms reductions and the civil use of plutonium, unattended computer based verification systems and other safeguards concepts for the future, and the review and extension of the NPT in 1995.
Author: International Atomic Energy Agency Publisher: IAEA ISBN: Category : Business & Economics Languages : en Pages : 188
Book Description
Over the past decade significant progress has been achieved in the development of waste characterization and control procedures and equipment as a direct response to ever-increasing requirements for quality and reliability of information on waste characteristics. Failure in control procedures at any step can have important, adverse consequences and may result in producing waste packages which are not compliant with the waste acceptance criteria for disposal, thereby adversely impacting the repository. The information and guidance included in this publication corresponds to recent achievements and reflects the optimum approaches, thereby reducing the potential for error and enhancing the quality of the end product. -- Publisher's description.
Author: Christian W. Fabjan Publisher: Springer Nature ISBN: 3030353184 Category : Elementary particles (Physics). Languages : en Pages : 1083
Book Description
This second open access volume of the handbook series deals with detectors, large experimental facilities and data handling, both for accelerator and non-accelerator based experiments. It also covers applications in medicine and life sciences. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
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Author: Ludovic Christophe-Alexandre Bourva
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Author: International Atomic Energy Agency
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Author: International Atomic Energy Agency
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Author: Christian W. Fabjan