Irradiation Effects for the Pulsed Fast Neutron Analysis (PFNA) Cargo Interrogation System

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At the request of Safety and Ecology Corporation of Tennessee, radiation effects of the proposed Pulsed Fast Neutron Analysis (PFNA) Cargo Interrogation System have been examined. First, fissile cargo were examined to determine if a significant neutron signal would be observable during interrogation. Results indicated that ample multiplication would be seen for near critical bare targets. The water-reflected sphere showed relatively little multiplication. By implication, a fissile target shielded by hydrogenous cargo might not be detectable by neutron interrogation, particularly if reliance is placed on the neutron signal. The cargo may be detectable if use can be made of the ... continued below

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554 pages

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Slater, C.O. February 2, 2001.

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Description

At the request of Safety and Ecology Corporation of Tennessee, radiation effects of the proposed Pulsed Fast Neutron Analysis (PFNA) Cargo Interrogation System have been examined. First, fissile cargo were examined to determine if a significant neutron signal would be observable during interrogation. Results indicated that ample multiplication would be seen for near critical bare targets. The water-reflected sphere showed relatively little multiplication. By implication, a fissile target shielded by hydrogenous cargo might not be detectable by neutron interrogation, particularly if reliance is placed on the neutron signal. The cargo may be detectable if use can be made of the ample increase in the photon signal. Second, dose rates were calculated at various locations within and just outside the facility building. These results showed that some dose rates may be higher than the target dose rate of 0.05 mrem/h. However, with limited exposure time, the total dose may be well below the allowed total dose. Lastly, estimates were made of the activation of structures and typical cargo. Most cargo will not be exposed long enough to be activated to levels of concern. On the other hand, portions of the structure may experience buildup of some radionuclides to levels of concern.

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554 pages

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  • Other Information: PBD: 2 Feb 2001

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  • Report No.: ORNL/TM-2000/352
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/777672 | External Link
  • Office of Scientific & Technical Information Report Number: 777672
  • Archival Resource Key: ark:/67531/metadc724564

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 2, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 29, 2016, 7:54 p.m.

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Slater, C.O. Irradiation Effects for the Pulsed Fast Neutron Analysis (PFNA) Cargo Interrogation System, report, February 2, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc724564/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.