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Figure 2: (a) Leksell Gamma Knife system with collimator 18 mm, (b) special cassette in the middle of spherical phantom for calibration of thermoluminescent dosimeters

Figure 2: (a) Leksell Gamma Knife system with collimator 18 mm, (b) special cassette in the middle of spherical phantom for calibration of thermoluminescent dosimeters