TY - JOUR
T1 - Metal-Latticed Collimators for Radiation Portal Monitors
AU - Wever, Ethan
AU - Webb, Collin
AU - Bae, Jung Hyun
AU - Bean, Robert
AU - Tognini, Stefano
AU - Cantonwine, Paul
AU - Enders, Alex
N1 - Publisher Copyright:
© 2024 American Nuclear Society. All rights reserved.
PY - 2024
Y1 - 2024
N2 - Detecting illicit material moving through RPMs is in the interest of national security. Eliminating background counts increases the possibility of detecting a source passing through the RPM as determined by an increased SNR. The numerical approximation of the analytical solution provided expected values for the MCNP model and demonstrated that geometry and tallies were configured correctly. The MCNP model allowed numerous parameters to be changed easily to maximize the SNR. The ideal rectangular mesh configuration resulted in a 109% increase in SNR when the source was present somewhere centered on the detectors. When the source was outside of the RPM, then the SNR decreased significantly, but because the RPM alarm system would be triggered by only one inflated count output, the RPM would have a much higher SNR when the collimator is used. The ability to enhance the sensitivity to point-like sources (vs. distributed sources) can be a useful RPM feature. This increased SNR indicates that when implemented, metal lattice collimators can enhance the performance of existing deployed RPMs with no other modifications necessary.
AB - Detecting illicit material moving through RPMs is in the interest of national security. Eliminating background counts increases the possibility of detecting a source passing through the RPM as determined by an increased SNR. The numerical approximation of the analytical solution provided expected values for the MCNP model and demonstrated that geometry and tallies were configured correctly. The MCNP model allowed numerous parameters to be changed easily to maximize the SNR. The ideal rectangular mesh configuration resulted in a 109% increase in SNR when the source was present somewhere centered on the detectors. When the source was outside of the RPM, then the SNR decreased significantly, but because the RPM alarm system would be triggered by only one inflated count output, the RPM would have a much higher SNR when the collimator is used. The ability to enhance the sensitivity to point-like sources (vs. distributed sources) can be a useful RPM feature. This increased SNR indicates that when implemented, metal lattice collimators can enhance the performance of existing deployed RPMs with no other modifications necessary.
UR - http://www.scopus.com/inward/record.url?scp=85215619411&partnerID=8YFLogxK
U2 - 10.13182/T131-45822
DO - 10.13182/T131-45822
M3 - Conference article
AN - SCOPUS:85215619411
SN - 0003-018X
VL - 131
SP - 848
EP - 851
JO - Transactions of the American Nuclear Society
JF - Transactions of the American Nuclear Society
IS - 1
T2 - 2024 Transactions of the American Nuclear Society on Winter Conference and Expo, ANS 2024
Y2 - 17 November 2024 through 21 November 2024
ER -