Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source

Ghosh, Vinita J.; Schaefer, Charles; Kahnhauser, Henry

doi:10.1097/HP.0000000000000651

Title: Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source

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Abstract

The National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory was shut down in September 2014. Lead bricks used as radiological shadow shielding within the accelerator were exposed to stray radiation fields during normal operations. The FLUKA code, a fully integrated Monte Carlo simulation package for the interaction and transport of particles and nuclei in matter, was used to estimate induced radioactivity in this shielding and stainless steel beam pipe from known beam losses. The FLUKA output was processed using MICROSHIELD® to estimate on-contact exposure rates with individually exposed bricks to help design and optimize the radiological survey process. This entire process can be modeled using FLUKA, but use of MICROSHIELD® as a secondary method was chosen because of the project’s resource constraints. Due to the compressed schedule and lack of shielding configuration data, simple FLUKA models were developed in this paper. FLUKA activity estimates for stainless steel were compared with sampling data to validate results, which show that simple FLUKA models and irradiation geometries can be used to predict radioactivity inventories accurately in exposed materials. During decommissioning 0.1% of the lead bricks were found to have measurable levels of induced radioactivity. Finally, post-processing with MICROSHIELD® provides an acceptable secondarymore »« less

Authors:

Ghosh, Vinita J. ^[1]; Schaefer, Charles ^[2]; Kahnhauser, Henry ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States). Energy Sciences Directorate. National Synchrotron Light Source II
Brookhaven National Lab. (BNL), Upton, NY (United States). Environment Safety and Health Directorate. Radiological Control Division

Publication Date:: 2017-06-30

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1425109

Report Number(s):: BNL-200054-2018-JAAM
Journal ID: ISSN 0017-9078; TRN: US1802044

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Health Physics

Additional Journal Information:: Journal Volume: 112; Journal Issue: 6; Journal ID: ISSN 0017-9078

Publisher:: Health Physics Society

Country of Publication:: United States

Language:: English

Subject:: 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION

Citation Formats


                    Ghosh, Vinita J., Schaefer, Charles, and Kahnhauser, Henry. Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source.  United States: N. p., 2017. 
Web.  doi:10.1097/HP.0000000000000651.

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                    Ghosh, Vinita J., Schaefer, Charles, & Kahnhauser, Henry. Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source.  United States.  https://doi.org/10.1097/HP.0000000000000651

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                    Ghosh, Vinita J., Schaefer, Charles, and Kahnhauser, Henry. Fri .  
"Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source".  United States.  https://doi.org/10.1097/HP.0000000000000651.  https://www.osti.gov/servlets/purl/1425109.

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@article{osti_1425109,

  title        = {Induced Radioactivity in Lead Shielding at the National Synchrotron Light Source},

  author       = {Ghosh, Vinita J. and Schaefer, Charles and Kahnhauser, Henry},

  abstractNote = {The National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory was shut down in September 2014. Lead bricks used as radiological shadow shielding within the accelerator were exposed to stray radiation fields during normal operations. The FLUKA code, a fully integrated Monte Carlo simulation package for the interaction and transport of particles and nuclei in matter, was used to estimate induced radioactivity in this shielding and stainless steel beam pipe from known beam losses. The FLUKA output was processed using MICROSHIELD® to estimate on-contact exposure rates with individually exposed bricks to help design and optimize the radiological survey process. This entire process can be modeled using FLUKA, but use of MICROSHIELD® as a secondary method was chosen because of the project’s resource constraints. Due to the compressed schedule and lack of shielding configuration data, simple FLUKA models were developed in this paper. FLUKA activity estimates for stainless steel were compared with sampling data to validate results, which show that simple FLUKA models and irradiation geometries can be used to predict radioactivity inventories accurately in exposed materials. During decommissioning 0.1% of the lead bricks were found to have measurable levels of induced radioactivity. Finally, post-processing with MICROSHIELD® provides an acceptable secondary method of estimating residual exposure rates.},

  doi          = {10.1097/HP.0000000000000651},

  journal      = {Health Physics},

  number       = 6,

  volume       = 112,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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