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Suppression of Afterglow in Microcolumnar CsI:Tl by Codoping With Sm: Recent Advances
Vivek V Nagarkar1, Samta C Thacker, Valeriy Gaysinskiy
1Radiation Monitoring Devices, Inc., Watertown, MA 02472 USA. ( VNagarkar@rmdinc.com ; VGaysinskiy@rmdinc.com ; LOvechkina@rmdinc.com ; SMiller@rmdinc.com ; SCool@rmdinc.com ; SThacker@rmdinc.com .).
IEEE Transactions on Nuclear Science
|September 28, 2011
Summary
Samarium-doped cesium iodide (CsI:Tl) films significantly reduce afterglow and hysteresis in X-ray imaging sensors. These enhanced CsI:Tl, Sm films offer improved brightness and performance for digital X-ray applications.
Area of Science:
- Materials Science
- Medical Physics
- Solid State Physics
Background:
- Microcolumnar Cesium Iodide doped with Thallium (CsI:Tl) is a preferred sensor for digital X-ray imaging due to high spatial resolution and efficiency.
- However, CsI:Tl sensors suffer from persistent afterglow and hysteresis, limiting their use in clinical and high-speed imaging.
Purpose of the Study:
- To develop and evaluate codoped microcolumnar CsI:Tl, Sm films.
- To combine the excellent properties of CsI:Tl with reduced afterglow and hysteresis.
Main Methods:
- Fabrication of codoped microcolumnar CsI:Tl, Sm films.
- Characterization of film properties including afterglow, hysteresis, and brightness.
- Comparison with standard CsI:Tl films.
Main Results:
- Codoped CsI:Tl, Sm films show a factor of 7 improvement in afterglow reduction.
- Brightness increased by 150% compared to standard CsI:Tl films.
- Significant reduction in hysteresis was observed.
Conclusions:
- Codoped CsI:Tl, Sm films offer a promising solution for advanced digital X-ray imaging.
- These enhanced films mitigate key limitations of traditional CsI:Tl sensors.
- Further development in film growth and imaging applications is warranted.
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