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Thick mercuric iodide (HgI2) detectors are being investigated as potential room temperature gamma-ray spectrometers. This paper presents an investigation of the polarization effects and long-term spectral stability of pixelated HgI2. Pixelated HgI2 detectors have shown good stability over several months of measurements. After the first four days, the photopeak position and resolution have remained relatively constant. Current pixelated HgI2 detectors may not suffer from polarization effects that once severely limited past planar HgI2 devices, and can have good energy resolution (approximately 2% for a Cs-137 source) while using a modest electric field (∼2500 V/cm) and a relatively short shaping time (8 μs).