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LXeGRIT is the first prototype of a novel Compton telescope for MeV gamma-rayastrophysics based on a Liquid Xenon Time Projection Chamber (LXeTPC),sensitive in the energy band of 0.15-10 MeV. In this homogeneous, 3D positionsensitive detector, gamma rays with at least two interactions in the sensitivevolume of 2800 cm$^{3}$, are imaged as in a standard Compton telescope.Gamma-rays with a single interaction cannot be imaged and constitute abackground which can be easily identified and rejected. Charged particles andlocalized beta-particles background is also easily suppressed based on the TPClocalization capability with millimeter resolution. A measurement of the totalgamma-ray background rate in near space conditions and the background rejectionpower of the LXeTPC was a primary goal of the LXeGRIT balloon flight program.We present here a preliminary analysis addressing this question, based onballoon flight data acquired during the Oct 4-5, 2000 LXeGRIT balloon flightfrom Ft. Sumner, NM. In this long duration (27 hr) balloon experiment, theLXeGRIT TPC was not surrounded by any gamma-ray or charged particle shield.Single site events and charged particles were mostly rejected on-line at thefirst and second trigger level. The remaining count rate of single-site \g-rayevents, at an average atmospheric depth of 3.2 g cm$^{-2}$, is consistent withthat expected from atmospheric and diffuse gamma-ray background, taking intoaccount the instrument mass model and response.Comment: 13 pages, 12 figures, SPIE 2002 Proceedings, Conf. Vol. 4851 - 151;  corrected reference

On the background rate in the LXeGRIT Instrument during the 2000 Balloon Flight