Nonproportionality Studies in Single Crystal Scintillators: Towards Improved Energy Resolution for Nuclear and Radiological Detectors
•
2 likes•304 views
Nonproportionality Studies in Single Crystal Scintillators: Towards Improved Energy Resolution for Nuclear and Radiological Detectors. Bi-annual Spanish Conference in Physics. Santander, Sept. 24th, 2011
More Related Content
Viewers also liked
Similar to Nonproportionality Studies in Single Crystal Scintillators: Towards Improved Energy Resolution for Nuclear and Radiological Detectors
Similar to Nonproportionality Studies in Single Crystal Scintillators: Towards Improved Energy Resolution for Nuclear and Radiological Detectors (20)
More from Martin Gascon
More from Martin Gascon (8)
Recently uploaded
Recently uploaded (20)
Nonproportionality Studies in Single Crystal Scintillators: Towards Improved Energy Resolution for Nuclear and Radiological Detectors
- 9. M. Gascón, S. Lam, R. Gaumé, R. Feigelson AOCL Stanford University Sept. 26th, 2011 9 Modeling: Pressure DSSSD Large Nonproportionality LuAlO 3 conduction band valence band Small Nonproportionality K2LaCl5 valence band conduction band dip: ↑ NPno dip: ↓ NP Difference in charge carrier mobilities.
- 10. M. Gascón, S. Lam, R. Gaumé, R. Feigelson AOCL Stanford University Sept. 26th, 2011 10 Light Yield Nonproportionality: Modeling DSSSD Observation of band structure of YAlO3 (YAP) and LuAlO3 (LuAP). YAP and LuAP have the same crystal structure, but exhibit very different nonproportionality. good proportionality poor proportionality Similar band dispersion except for the presence of “dip” in conduction band minimum (CBM) of LuAP as indicated with the arrow valence band X Y Z U R T S 1st Brillouin Zone
- 11. M. Gascón, S. Lam, R. Gaumé, R. Feigelson AOCL Stanford University Sept. 26th, 2011 11 Motivation: Pressure experiment Mobilities of charge carriers better matched
- 12. M. Gascón, S. Lam, R. Gaumé, R. Feigelson AOCL Stanford University Sept. 26th, 2011 12 Isostatic pressure http://harwoodeng.com/ Specifications: Pressure range: 0<Piso<1 GPa Large sample volume: >5 cm3 Operated at ambient temperature Compatible with hygroscopic materials Good pressure stability
- 16. M. Gascón, S. Lam, R. Gaumé, R. Feigelson AOCL Stanford University Sept. 26th, 2011 16 Conclusions Adequate detection and identification of radioactive material require scintillators with good light yield proportionality and energy resolution Light yield proportionality requires an effective mass ratio of 1 (well matched charge carrier mobilities) Nonproportionality and carrier mobility can be probed through application of high pressure and low temperature This program is funded by the USA Domestic Nuclear Detection Office (DNDO) and Dept. of Homeland Security (DHS).