TY - GEN
T1 - Fourth-generation microstructured semiconductor neutron detector (MSND)-based 3He replacement (HeRep) for high pressure 3He detectors
AU - Ochs, Taylor R.
AU - Bellinger, Steven L.
AU - Fronk, Ryan G.
AU - Henson, Luke C.
AU - Huddleston, David E.
AU - Schlaikier, Graham E.
AU - Sobering, Timothy J.
AU - Van Bergeijk, Adam
AU - McGregor, Douglas S.
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2017/10/16
Y1 - 2017/10/16
N2 - Two fourth-generation 3He replacement (HeRep Mk IV) detectors based on microstructured semiconductor neutron detector (MSND) technology have been fabricated and characterized against a 0.75-in diameter by 3.0-in long, 10-atm 3He neutron proportional counter. The HeRep Mk IV detectors have a 0.75-in by 0.75-in square form factor with one HeRep Mk IV measuring 3.1-in long and the other measuring 6.1-in long. Each HeRep Mk IV was populated with 15 DS-MSNDs that have an intrinsic thermal-neutron detection efficiency of approximately 50%. The void spaces between adjacent detectors in the 6.1-in long HeRep Mk IV were filled with HDPE moderator. The 3.1-in long HeRep Mk IV recorded 92.8 ± 1.8% of the count rate of the 10-atm 3He detector for bare 26.5-ng 2S2Cf, bare detector and 82.2 ± 0.9% for moderated 2S2Cf source, moderated detector configurations. The 6.1-in long HeRep Mk IV count rate was 108.5 ± 2.0% and 113.8 ± 1.2% of the count rate of the 10-atm 3He detector for bare 2S2Cf, bare detector and moderated 282Cf, moderated detector, respectively. The gamma-ray rejection ratio was determined for 137Cs at a dose rate of 50 mR/hr. The gamma-ray rejection ratio was 1:1.5x108 and 1:4.6x108 for the 3.1-in long and 6.1-in long HeRep Mk IV, respectively. The HeRep Mk IVs exhibit a 116% (3.1-in long) and 33% (6.1-in long) improvement in intrinsic detection efficiency over the 0.75-in diameter by 4.5-in long HeRep Mk III for moderated 282Cf at 25 cm.
AB - Two fourth-generation 3He replacement (HeRep Mk IV) detectors based on microstructured semiconductor neutron detector (MSND) technology have been fabricated and characterized against a 0.75-in diameter by 3.0-in long, 10-atm 3He neutron proportional counter. The HeRep Mk IV detectors have a 0.75-in by 0.75-in square form factor with one HeRep Mk IV measuring 3.1-in long and the other measuring 6.1-in long. Each HeRep Mk IV was populated with 15 DS-MSNDs that have an intrinsic thermal-neutron detection efficiency of approximately 50%. The void spaces between adjacent detectors in the 6.1-in long HeRep Mk IV were filled with HDPE moderator. The 3.1-in long HeRep Mk IV recorded 92.8 ± 1.8% of the count rate of the 10-atm 3He detector for bare 26.5-ng 2S2Cf, bare detector and 82.2 ± 0.9% for moderated 2S2Cf source, moderated detector configurations. The 6.1-in long HeRep Mk IV count rate was 108.5 ± 2.0% and 113.8 ± 1.2% of the count rate of the 10-atm 3He detector for bare 2S2Cf, bare detector and moderated 282Cf, moderated detector, respectively. The gamma-ray rejection ratio was determined for 137Cs at a dose rate of 50 mR/hr. The gamma-ray rejection ratio was 1:1.5x108 and 1:4.6x108 for the 3.1-in long and 6.1-in long HeRep Mk IV, respectively. The HeRep Mk IVs exhibit a 116% (3.1-in long) and 33% (6.1-in long) improvement in intrinsic detection efficiency over the 0.75-in diameter by 4.5-in long HeRep Mk III for moderated 282Cf at 25 cm.
UR - https://www.scopus.com/pages/publications/85041709475
U2 - 10.1109/NSSMIC.2016.8069930
DO - 10.1109/NSSMIC.2016.8069930
M3 - Conference contribution
AN - SCOPUS:85041709475
T3 - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
BT - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
Y2 - 29 October 2016 through 6 November 2016
ER -