Development of TlBr arrays for hard x- and gamma-ray spectroscopy

Alan Owens; Marcos Bavdaz; Vladimir Gostilo; Roland H. den Hartog; Alex G. Kozorezov; I. Lisjutin; Anthony J. Peacock; Sergey Zatoloka

doi:10.1117/12.453819

10 January 2003 Development of TlBr arrays for hard x- and gamma-ray spectroscopy

Alan Owens, Marcos Bavdaz, Vladimir Gostilo, Roland H. den Hartog, Alex G. Kozorezov, I. Lisjutin, Anthony J. Peacock, Sergey Zatoloka

Author Affiliations +

Proceedings Volume 4784, X-Ray and Gamma-Ray Detectors and Applications IV; (2003) https://doi.org/10.1117/12.453819
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

TlBr is relatively unique amongst semiconductors, in view of its very high density coupled with its large band-gap. In fact, its density (7.5 g cm^-3) is comparable to bismuth germanate and thus it has excellent absorbing power for hard X- and gamma rays. For example, a 1 mm thick detector, has a usable efficiency of ~10% at 500 keV. Its lowest energy of operation is set by leakage currents at typically 1 keV. Such a wide dynamic range is ideally suited for a range of applications, such as gamma-ray astronomy, isotopic measurements for environmental redemption and particularly nuclear medicine, where small size and large stopping power are highly desirable attributes. Additionally, its band-gap energy of 2.7 eV is large enough to ensure low noise performance at room or even elevated temperatures. In this paper we assess the suitability of using TlBr arrays for X- and gamma-spectroscopy and specifically for nuclear medicine applications. For example, it is shown that the attributes of TlBr make it an ideal material for the production of intra-operative, radio-guided surgical probes, which operate in the hard X- and low energy gamma-ray regions. By using a segmented or pixelated anode design and tailoring the geometry to promote the near-field effect, most of the negative material attributes normally associated with TlBr (e.g. poor hole transport) can be largely negated.

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Alan Owens, Marcos Bavdaz, Vladimir Gostilo, Roland H. den Hartog, Alex G. Kozorezov, I. Lisjutin, Anthony J. Peacock, and Sergey Zatoloka "Development of TlBr arrays for hard x- and gamma-ray spectroscopy", Proc. SPIE 4784, X-Ray and Gamma-Ray Detectors and Applications IV, (10 January 2003); https://doi.org/10.1117/12.453819

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KEYWORDS

Sensors

Gamma radiation

Nuclear medicine

Photons

Absorption

Diffusion

Near field

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