Studies of Limits on Uncontrolled Heavy Ion Beam Losses for Allowing Hands-On Maintenance

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Dose rates from accelerator components activated by 1 W/m beam losses are obtained semiempirically for a 1 GeV proton beam and by use of Monte Carlo transport codes for the proton beam and for 777 MeV/u 3He, 500 MeV/u 48Ca, 86Kr, 136Xe, and 400 MeV/u 238U ions. The dose rate obtained by the semi-empirical method, 0.99 mSv/h (99 mrem/h) at 30 cm, 4 h after 100 d irradiation by a 1-GeV proton beam, is consistent with studies at several accelerator facilities and with adopted hands-on maintenance dose rate limits. Monte Carlo simulations verify this result for protons and extend studies ... continued below

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1.7 Megabytes; 47 pages

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Ronningen, Reginald M. & Remec, Igor September 11, 2010.

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Dose rates from accelerator components activated by 1 W/m beam losses are obtained semiempirically for a 1 GeV proton beam and by use of Monte Carlo transport codes for the proton beam and for 777 MeV/u 3He, 500 MeV/u 48Ca, 86Kr, 136Xe, and 400 MeV/u 238U ions. The dose rate obtained by the semi-empirical method, 0.99 mSv/h (99 mrem/h) at 30 cm, 4 h after 100 d irradiation by a 1-GeV proton beam, is consistent with studies at several accelerator facilities and with adopted hands-on maintenance dose rate limits. Monte Carlo simulations verify this result for protons and extend studies to heavy ion beam losses in drift-tube linac and superconducting linac accelerating structures. The studies indicate that the 1 W/m limit imposed on uncontrolled beam losses for high-energy proton beams might be relaxed for heavy ion beams. These studies further suggest that using the ratio of neutrons produced by a heavy ion beam to neutrons produced by a proton beam along with the dose rate from the proton beam (for thin-target scenarios) should allow an estimate of the dose rates expected from heavy ion beam losses.

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1.7 Megabytes; 47 pages

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  • Report No.: DOE/ER/41475
  • Grant Number: FG02-07ER41475
  • DOI: 10.2172/988186 | External Link
  • Office of Scientific & Technical Information Report Number: 988186
  • Archival Resource Key: ark:/67531/metadc1014599

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

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  • September 11, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 2, 2017, 3:08 p.m.

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Ronningen, Reginald M. & Remec, Igor. Studies of Limits on Uncontrolled Heavy Ion Beam Losses for Allowing Hands-On Maintenance, report, September 11, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc1014599/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.