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Title: A Directional Detector Response Function for Anisotropic Detectors

Journal Article · · Nuclear Science and Engineering
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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For a radiation detector that is not isotropic, a directional detector response is needed to accurately account for the variation in a detector’s behavior depending on the incoming particle direction. The concept of the detector response function has been extended to include particle direction using a set of pregenerated detector responses based on the orientation of the incoming radiation and the detector. This directional detector response function (DDRF) then can be applied to the flux and current tallies computed by a Monte Carlo simulation. Validation of the new approach has been done by comparing simulated count rates processed with the DDRF to measured count rates taken with a 5.08 × 10.16 × 40.64-cm NaI(Tl) detector. The comparisons show that the applied method produces good agreement with both background and source measurements with a 137Cs source. Furthermore, separation of the detector response generation from Monte Carlo particle transport calculations provides greater flexibility in locating single or multiple detectors without any interference in the model and also enables simulation of various models using the same detector response without the need for generating additional detector responses if the same detector is being used.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1545218
Journal Information:
Nuclear Science and Engineering, Vol. 193, Issue 12; ISSN 0029-5639
Publisher:
American Nuclear Society - Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

References (6)

Response functions for sodium iodide scintillation detectors journal October 1972
Monte Carlo Shielding Analysis Capabilities with MAVRIC journal May 2011
Initial MCNP6 Release Overview journal December 2012
A Methodology for Determining the Concentration of Naturally Occurring Radioactive Materials in an Urban Environment journal April 2018
Multiagency Urban Search Experiment Detector and Algorithm Test Bed journal July 2017
A new Monte Carlo assisted approach to detector response functions journal January 2004

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