Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session D13: Instrumentation: Rare Event and Low-Level Signal Measurements
9:00 AM–11:45 AM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kona 2-3
Chair: Phillip Barbeau, Duke University
Abstract: D13.00001 : First results of trace-uranium detection using newly developed γ-γ coincidence neutron activation analysis
9:00 AM–9:15 AM
Presenter:
Dmitry Chernyak
(University of Alabama)
Authors:
Dmitry Chernyak
(University of Alabama)
Andreas Piepke
(University of Alabama)
Raymond Hei Man M Tsang
(University of Alabama)
Sean W Finch
(Duke University)
Ryan MacLellan
(University of Kentucky)
Timothy V Daniels
(University of North Carolina Wilmington)
To meet this challenge, we developed a new counting scheme for NAA which makes use of gamma cascades emitted in 239Np decay, the neutron activation product of 238U. The new counting scheme is expected to improve the detection limit of 238U in sapphire by a factor of 8, compared to single-γ counting achieving about 10 ppt sensitivity. We re-activated a previously studied sapphire sample at the MIT research reactor. The measurements were performed using two HPGe detectors at the Triangle Universities Nuclear Laboratory (TUNL). In this talk, I will present first results of γ-γ coincidence NAA for sapphire and compare them to previously obtained single-γ NAA results.
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