Performance data of optically stimulable irradiated materials (doped alkali halides) oriented for imaging and dosimetry purposes

Aija Tale; Irena Plavina; A. Kalnins; Anatoli I. Popov

doi:10.1117/12.266512

4 February 1997 Performance data of optically stimulable irradiated materials (doped alkali halides) oriented for imaging and dosimetry purposes

Aija Tale, Irena Plavina, A. Kalnins, Anatoli I. Popov

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Proceedings Volume 2967, Optical Inorganic Dielectric Materials and Devices; (1997) https://doi.org/10.1117/12.266512
Event: International Conference on Advanced Optical Materials and Devices, 1996, Riga, Latvia

Abstract

Performance characteristics of a doped alkali halide (KBr:In)-based imaging plate (IP) and dosemeter (D) both the devices utilizing optically stimulated luminescence (OSL) and suitable for UV-light and x-ray energy recording are described. By exploiting (silicon) photodiode array as a photodetector, the detective quantum efficiency of 0.1 for IP (KBr:In) can be achieved. A very wide dynamic range, 10¹⁰:1 for UV (6.35 eV) and 10¹¹:1 for x-ray (44 kV tube voltage) OSL recording at the spatial resolution of 1 mm², is favorable for digital imaging and considerably improves image quality. These possibilities are illustrated by presenting available information capacities, energy consumption per bit as a function of the spatial resolution, and signal contrast ratio as a function of the input energy if using the KBr:In material with optimum characteristics (the activator concentration of 10¹⁷ cm^-3, the 245 nm UV-light sensitization of UV detecting, minimum concentration of Ca⁺² ions, etc.). Both the radiation dose storage is stable only up to 18 degrees Celsius and 200 s after an x-bremsstrahlung write at this temperature. When used for dose measuring, KBr-In monocrystals can be exploited for low-intensity x-ray detection and provide a possibility of the space background measuring in a second time interval.

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Aija Tale, Irena Plavina, A. Kalnins, and Anatoli I. Popov "Performance data of optically stimulable irradiated materials (doped alkali halides) oriented for imaging and dosimetry purposes", Proc. SPIE 2967, Optical Inorganic Dielectric Materials and Devices, (4 February 1997); https://doi.org/10.1117/12.266512

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KEYWORDS

X-rays

Spatial resolution

Quantum efficiency

Signal to noise ratio

Ultraviolet radiation

Information operations

Photodetectors

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