Neutron Source Strength Estimates from (a, n) Reactions in Binary Mixtures of Actinide Particles and Light Element Particles

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The cumulative distribution of package dose rates, based on the 18 batches of historical PuO{sub 2} particle size distributions, is shown in Fig. 6 for ''Hanford 10-13% Pu-240'' plutonium. The calculated dose rates for all batches range from about 50 mrem/h to about 2,200 mrem/h, with over 50% of the batches being less than the 200 mrem/h limit for public transportation. A more refined analysis would show that almost all of the batches would be less than 200 mrem/h, but some could exceed this limit as seen by the distribution shape. Without detailed characterization of the BeO particle size distribution, ... continued below

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12 p. (0.5 MB)

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Boles, J L; Hafner, R S & Fischer, L E May 6, 2005.

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Description

The cumulative distribution of package dose rates, based on the 18 batches of historical PuO{sub 2} particle size distributions, is shown in Fig. 6 for ''Hanford 10-13% Pu-240'' plutonium. The calculated dose rates for all batches range from about 50 mrem/h to about 2,200 mrem/h, with over 50% of the batches being less than the 200 mrem/h limit for public transportation. A more refined analysis would show that almost all of the batches would be less than 200 mrem/h, but some could exceed this limit as seen by the distribution shape. Without detailed characterization of the BeO particle size distribution, additional analysis would not remove the uncertainty in these calculations. Because the actual amount of beryllium contamination is likely to be much less than 500 g, the dose rates would be expected to be much lower than those shown here. Based on the particle size distribution analysis of the 18 batches analyzed, it is also likely that most of the 3013 cans to be loaded in the 9975 Package will have dose rates that are less than the 200 mrem/h limit for the package surface. However, extra care will be required in performing, and verifying, the dose rate measurements at the surface of the package, prior to shipment.

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12 p. (0.5 MB)

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PDF-file: 12 pages; size: 0.5 Mbytes

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  • Presented at: 2005 ASME Pressure Vessels and Piping Division Conference, Denver, CO, United States, Jul 17 - Jul 21, 2005

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  • Report No.: UCRL-CONF-212717
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877795
  • Archival Resource Key: ark:/67531/metadc875757

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  • May 6, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • April 13, 2017, 3:45 p.m.

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Boles, J L; Hafner, R S & Fischer, L E. Neutron Source Strength Estimates from (a, n) Reactions in Binary Mixtures of Actinide Particles and Light Element Particles, article, May 6, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875757/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.