Gamma Attribute Measurements - Pu300, Pu600, Pu900

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Gamma rays are ideal probes for the determination of information about the special nuclear material that is in the transparency regime. Gamma rays are good probes because they interact relatively weakly with the containers that surround the SNM under investigation. In addition, gamma rays carry a great deal of information about the material under investigation. We have leveraged these two characteristics to develop three technologies that have proven useful for the measurements of various attributes of plutonium. These technologies are Pu-300, Pu-600 and Pu-900. These technologies obtain the age, isotopics and presence/absence of oxide of a plutonium sample, respectively. Pu-300 ... continued below

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Luke, S.J. & Archer, D.E. June 29, 2000.

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Gamma rays are ideal probes for the determination of information about the special nuclear material that is in the transparency regime. Gamma rays are good probes because they interact relatively weakly with the containers that surround the SNM under investigation. In addition, gamma rays carry a great deal of information about the material under investigation. We have leveraged these two characteristics to develop three technologies that have proven useful for the measurements of various attributes of plutonium. These technologies are Pu-300, Pu-600 and Pu-900. These technologies obtain the age, isotopics and presence/absence of oxide of a plutonium sample, respectively. Pu-300 obtains the time since the last {sup 241}Am separation for a sample of plutonium. This is accomplished by looking at the {sup 241}Am/{sup 241}pu ratio in the energy region from 330-350 keV, hence the name Pu-300. Pu-600 determines the isotopics of the plutonium sample under consideration. More specifically, it determines the {sup 240}Pu/{sup 239}Pu ratio to determine if the plutonium sample is of weapons quality or not. This analysis is carded out in the energy region from 630-670 keV. Pu-900 determines the absence of PuO{sub 2} by searching for a peak at 870.7 keV. If this peak is absent then there is no oxide in the sample. This peak arises from the de-excitation of the first excited state of {sup 17}O. The assumption being made is that this state is populated by means of the {sup 17}O({alpha},{alpha}{prime}) reaction. The first excited state of {sup 17}O could also be populated by means of the {sup 14}N({alpha},p) reaction, which might indicate that this is not a good signature for the absence of PuO{sub 2}, however in the samples we have measured this peak is visible in oxide samples and is absent in other samples. In this paper we will discuss the physics details of these technologies and also present results of various measurements.

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512 Kilobytes pages

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  • 41st Annual Meeting of the Institute of Nuclear Materials Management, New Orleans, LA (US), 07/15/2000--07/20/2000

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  • Report No.: UCRL-JC-139448
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 792530
  • Archival Resource Key: ark:/67531/metadc741399

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  • June 29, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 3:54 p.m.

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Luke, S.J. & Archer, D.E. Gamma Attribute Measurements - Pu300, Pu600, Pu900, article, June 29, 2000; California. (digital.library.unt.edu/ark:/67531/metadc741399/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.