Journal of Radioanalytical and Nuclear Chemistry

, Volume 249, Issue 2, pp 407–412 | Cite as

Estimation of background interference in prompt-gamma neutron activation using MCNP

  • R. J. ShypailoEmail author
  • K. J. Ellis


Prompt-gamma neutron activation (PGNA) is used to measure total-bodynitrogen and hydrogen in humans. Background interference in the gamma spectraarises from both subject and shielding. A Monte Carlo simulation program (MCNP4B2)was used to examine the neutron and gamma signals in the PGNA system ( 241AmBe source). N and H peak regions were assessed in the presenceand absence of calibration phantoms. The simulations suggested extracorporealH peak contributions of up to 30%, depending on subject body habitus. MostN background could be attributed to detector pileup events. The MCNP resultsallowed us to improve shielding design and develop background correction algorithmsto improve measurement precision.


Hydrogen Physical Chemistry Inorganic Chemistry Monte Carlo Simulation Measurement Precision 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers/Akadémiai Kiadó 2001

Authors and Affiliations

  1. 1.USDA/ARS Children's Nutrition Research Center, Department of PediatricsBaylor College of MedicineHoustonUSA

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