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POTENTIAL POLYCAPILLARY X-RAY OPTICS FOR HIGH ENERGY SCATTER REJECTION DEVICE

Cari1, Suparmi1, W. M. Gibson2 and C. A. MacDonald2

1Physics Department, Sebelas Maret University, Surakarta, Indonesia
Center for X-Ray Optics, Physics Department, SUNY, University at Albany, USA2

Abstract
Simulations and measurements have been performed for prototype polycapillary x-ray optics at photon energies from 20 to 80 keV to investigate the possible application for scatter rejection at higher energies. A prototype collector in collimating mode has high transmission up to 40 keV, good uniformity, and small exit divergence. The transmission of a small taper is 71% at 20 keV and close to 30% at 40 keV. The scatter transmission of the taper, measured using a 6 cm thick polyethylene phantom, was about 1% at 40 keV and is around 5% at 60 keV. Even better scatter rejection could be achieved by using lead glass capillaries. Because of the removal of scatter radiation, the measured contrast enhancement for the taper is a nearly factor of three at 40 keV. By estimating the contrast improvement factor and Signal to Noise Ratio (SNR) with the scaled up optics, this paper demonstrates the potential for polycapillary optics in various high energy applications.

Publication : Physics Journal IPS Proceeding Supplement A6 (2002) 0520
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Additional info : 5 pages, language English