Liquid Scintillation Counter using U-238 to detect neutrons

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SUMMARY

This discussion focuses on the construction of a Liquid Scintillation Counter (LSC) utilizing U-238 in a non-aqueous form to detect fast neutrons emitted from a Cf-252 source. Key calculations include determining the wavelength of light emerging from the scintillating cocktail and assessing light collection efficiency and the number of photoelectrons striking the photocathode. It is noted that the wavelength cannot be directly calculated but can be referenced from scientific literature or modeling software such as PENELOPE or GEANT. Additionally, concerns regarding neutron moderation within the LSC geometry were raised.

PREREQUISITES
  • Understanding of Liquid Scintillation Counters (LSC)
  • Knowledge of neutron detection principles
  • Familiarity with U-238 properties and behavior in scintillating cocktails
  • Experience with simulation software like PENELOPE or GEANT
NEXT STEPS
  • Research the properties of U-238 in scintillation applications
  • Learn how to use PENELOPE for neutron detection simulations
  • Investigate light collection efficiency calculations in LSCs
  • Explore the geometry and design considerations for LSCs detecting fast neutrons
USEFUL FOR

Researchers and engineers involved in nuclear detection, radiation safety professionals, and anyone developing or optimizing Liquid Scintillation Counters for neutron detection applications.

Priyo
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I'm trying to make a LSC with U-238 (non-aqueous form) dipped in the scintillating cocktail to detect fast neutrons (no thermals or epithermals, only fast) from a Cf-252 source. How do I calculate the wavelength emerging from the cocktail (assuming U-238 does not react with the cocktail)? Also, how do I calculate the light collection efficiency, and the number of photoelectrons hitting the photocathode?

All the help that I can get, much much appreciated!
 
Priyo said:
I'm trying to make a LSC with U-238 (non-aqueous form) dipped in the scintillating cocktail to detect fast neutrons (no thermals or epithermals, only fast) from a Cf-252 source. How do I calculate the wavelength emerging from the cocktail (assuming U-238 does not react with the cocktail)? Also, how do I calculate the light collection efficiency, and the number of photoelectrons hitting the photocathode?

All the help that I can get, much much appreciated!

I don't understand the geometry. Don't the neutrons get moderated in the LSC before absorption in the 238?

You can't calculate the wavelength emerging from the cocktail, but you can look it up in a paper, or it may be built into some of the modeling programs like PENELOPE or GEANT.
 
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