Abstract
Electron storage rings generate energetic bremsstrahlung photons through radiative interaction of the particle beam with the residual gas molecules and other components inside the storage ring. At the Advanced Photon Source (APS), where the stored beam energy is 7 GeV, bremsstrahlung generated in the straight sections of the insertion devices comes down through the beamlines. The resulting absorbed dose distributions by this radiation in a 300 mm × 300 mm × 300 mm tissue substitute phantom were measured with LiF:Mg, Ti (TLD-700) thermoluminescent dosimeters. The average normalized absorbed dose, in a cross sectional area of 100 mm2 at a depth of 150 mm of the PMMA phantom, was measured as 3.3 × 106 mGy h−1W−1 for a 7-GeV bremsstrahlung spectrum.
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