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Multiple doping of CsI:Tl crystals and its effect on afterglow
E E Ovechkina1, V Gaysinskiy, S R Miller
1Radiation Monitoring Devices, Inc., 44 Hunt Street, Watertown, MA 02472, USA.
Radiation Measurements
|May 2, 2008
Summary
Researchers investigated codopants to reduce afterglow in Cesium Iodide: Thallium (CsI:Tl) scintillators. They found that secondary additives, like iodine and oxides, significantly impact the effectiveness of Europium (Eu2+) in suppressing afterglow for improved imaging.
Area of Science:
- Materials Science
- Nuclear Instrumentation
- Solid-State Physics
Background:
- Cesium Iodide doped with Thallium (CsI:Tl) is a widely used scintillator.
- A significant afterglow in CsI:Tl hinders high-speed imaging applications like radiography and radionuclide imaging.
- Afterglow causes issues such as pulse pileup, reduced energy resolution, and reconstruction artifacts.
Purpose of the Study:
- To investigate methods for suppressing the afterglow in CsI:Tl scintillators.
- To evaluate the impact of codopants, specifically Europium (Eu2+), on CsI:Tl afterglow.
- To understand the influence of secondary additives on the afterglow suppression efficacy of Eu2+.
Main Methods:
- Modification of CsI:Tl crystals with codopants.
- Characterization of scintillation decay properties.
- Analysis of the effects of secondary additives, including elemental iodine and oxidic species.
Main Results:
- Europium (Eu2+) codoping significantly reduced CsI:Tl afterglow intensity by nearly two orders of magnitude.
- The effectiveness of Eu2+ in afterglow suppression was found to be highly dependent on the presence of other additives.
- Secondary codopants, such as iodine and various oxides, were identified as influencing the suppressive effect.
Conclusions:
- Codoping CsI:Tl with Eu2+ is a promising strategy for mitigating afterglow.
- Careful control of secondary additives is crucial for optimizing Eu2+ based afterglow suppression.
- Further research into the role of these secondary codopants is necessary for advanced scintillator development.
