Graduate Calculate neutron dose rate from a reactor to an object

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SUMMARY

This discussion focuses on calculating the neutron dose rate to an object, specifically 1g of quartz (SiO2), within a research reactor's neutron flux. The average kinetic energy of the reactor neutrons is 2 MeV, with thermal and fast neutron fluxes of 1E13 n/cm²/sec and 1E12 n/cm²/sec, respectively. The participant seeks clarity on how to account for varying neutron energies and the application of NIEL (non-ionizing energy loss) values, which are typically normalized to 1 MeV neutrons. The conversation highlights the scarcity of resources for calculating neutron doses to materials other than humans.

PREREQUISITES
  • Understanding of neutron flux measurements
  • Knowledge of neutron energy spectra
  • Familiarity with NIEL (non-ionizing energy loss) concepts
  • Basic principles of radiation dose calculations
NEXT STEPS
  • Research neutron dose calculation methods for materials other than humans
  • Study the impact of neutron energy variations on dose rates
  • Explore the use of NIEL values in radiation damage assessments
  • Learn about neutron cross-sections relevant to silicon and quartz
USEFUL FOR

Researchers in nuclear engineering, radiation safety professionals, and materials scientists interested in neutron interactions with various materials.

Eibbor
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So, I'd like to calculate the dose rate to an object, say 1g of quartz (SiO2) placed into a research reactor neutron flux. The average kinetic energy of research reactor neutrons is 2 MeV but individual neutron energies vary dramatically. Say the thermal neutron flux is 1E13 n/cm2/sec and the fast neutron flux is 1E12 n/cm2/sec. I'm confused as to how to properly take the different ranges of energies into account, or whether to use average energy. I see a lot of information for calculating neutron dose to humans but not much for calculating neutron dose to anything else. Any helpful info or formulas I'm missing would be appreciated. I don't expect you to look up all the cross-sections or anything, just any helpful info would be great. Thanks!
 
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Chances are good the reactor operators have some value for NIEL (non-ionzing energy loss), where they integrated over the energies to normalize everything to 1 MeV neutrons. This is typically done for silicon, other materials might have different energy/damage relations, often those are not well-known.
 

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