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Polaris CdZnTe Gamma-Ray Imaging Spectrometer Systems

Polaris CdZnTe Gamma-Ray Imaging Spectrometer Systems. On behalf of the Orion group. Zhong He. ISOE International ALARA Symposium Tokyo, Japan, 27-29 August, 2013. Polaris Systems. Eighteen 221.5 cm 3 CdZnTe detectors ( 108 cm 3 , 648 grams = 1.43 lb). .

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Polaris CdZnTe Gamma-Ray Imaging Spectrometer Systems

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  1. PolarisCdZnTe Gamma-Ray Imaging Spectrometer Systems On behalf of the Orion group Zhong He ISOE International ALARA Symposium Tokyo, Japan, 27-29 August, 2013

  2. Polaris Systems Eighteen 221.5 cm3 CdZnTe detectors (108 cm3, 648 grams = 1.43 lb)  Performance GoalsE/E  1% FWHM (at 662 keV)Real-time  Imaging + isotope I.D.   E2 E1 Number of photons: 18 97 2033 3 4 1 2

  3. Polaris 1.1 (GMI ASIC) – August 2010

  4. 137Cs Energy Spectra of the 1stPolaris system #1.1(From all 18 detectors of Polaris, 24oC, uncollimated 137Cs) • 1-pixel events • 2-pixel events • 3-pixel events • 4-pixel events 662 keV 1.44% FWHM All events Counts Energy (keV)

  5. 2nd-GenerationPolaris System #2.1 (BNL ASIC)(From all 18 detectors, room-temperature, uncollimated 137Cs) 662 keV Single-pixel events 0.61% (4.0 keV) FWHM

  6. 2nd-GenerationPolaris System #2.1 (BNL ASIC)(From all 18 detectors, room-temperature, uncollimated 137Cs) 662 keV All events – no selection July 2012 0.86% (5.7 keV) FWHM Peak-to-Compton ratio 20.5

  7. Next-Generationdigital3-D CdZnTe detectors (VAD_UM digital ASIC, Room-temperature, uncollimated 137Cs) 662 keV Energy resolutions (FWHM) of all events measured on best detectors 0.46% FWHM Counts E/E is stilllimited by ASIC noise ! Peak-to-Compton ratio 22.5 ( 25.1 if no event selection) Energy (keV)

  8. 228Th Energy Spectra Polaris-2 D.E. 2614keV S.E. Counts Energy (keV)

  9. Yuefeng Zu Willy Kaye He Weiyi Wang 22Na 60Co Chris Wahl 137Cs 137Cs Target specific -Spec. Polar Angle 23 min. data EIID Azimuthal Angle

  10. Real-Time Combined Coded Aperture and Compton Imaging for Locating Sources From all18 detectors Isotope selected: 57Co,22Na,137Cs 122 keV 662 keV 511 keV 1275 keV

  11. Detection Sensitivity of Polaris Image of 650  E  674 keV SBP with 2 – 4 pixel events 208Tl 583.2 Source Present 214Bi 609.3 • Background • 137Cs present A 30 Ci Cs-137 source behind a wall at ~4m 40K 1461 A 12-hour “background” Measurement All events

  12. Today and Tomorrow

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