Scintillation materials with reduced afterglow and method of preparation
OwnerCharles Brecher, Vivek Nagarkarinventors
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Abstract
Scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, and a variety of second dopants (co-dopants). In another embodiment, the scintillation materials of this invention have an alkali halide host material, a (first) scintillation dopant of various types, a variety of second dopants (co-dopants), and a variety of third dopants (co-dopants). Co-dopants of this invention are capable of providing a second auxiliary luminescent cation dopant, capable of introducing an anion size and electronegativity mismatch, capable of introducing a mismatch of anion charge, or introducing a mismatch of cation charge in the host material.
Claims2
A radiation detector comprising:
- a scintillator, said scintillator comprising:
- a cesium iodide host material;
- a first dopant comprising a thallium cation, a molar concentration of said first dopant being less than about 10%;
- and
- a second dopant comprising a europium cation;
- the second dopant resulting in the scintillator having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1% and substantially 10%.
A penetrating radiation imaging/analysis device comprising:
- at least one radiation detector, said at least one radiation detector comprising:
- a scintillator, said scintillator comprising:
- a cesium iodide host material;
- a first dopant comprising a thallium cation, a molar concentration of said first dopant being less than about 10%;
- and
- a second dopant comprising a europium cation;
- the second dopant resulting in the scintillator having substantially reduced afterglow;
- a molar concentration of said second dopant being between substantially 0.1% and substantially 10%;
- and
- a photodetector, said photodetector receiving electromagnetic radiation emanating from said scintillator.
Dependencies are inferred from the claim text.