Measurement of absorbed dose by 7-GeV bremsstrahlung in a PMMA phantom |
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| Affiliation: | 1. Molecular Immunopharmacology and Drug Discovery Laboratory, Department of Immunology, Tufts University School of Medicine, Boston, Massachusetts;2. School of Graduate Biomedical Sciences, Program in Pharmacology and Experimental Therapeutics, Tufts University, Boston, Massachusetts;3. Department of Internal Medicine, Tufts University School of Medicine and Tufts Medical Center, Boston, Massachusetts;4. Department of Psychiatry, Tufts University School of Medicine and Tufts Medical Center, Boston, Massachusetts;1. Yunnan Scientific Observation Station for Cultivated Land Conservation of the Ministry of Agriculture and Rural Affairs, Yunnan Agriculture University, Kunming, 650201, China;2. Plant Germplasm and Genomics Center, The Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650201, China;3. Development of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA;1. Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Room Y921, 9/F, Lee Shau Kee Building, Hung Hom, Kowloon, Hong Kong, China;2. Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Room Y914, 9/F, Lee Shau Kee Building, Hung Hom, Kowloon, Hong Kong, China;1. Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7A, FI-90220 Oulu, Finland;2. Université de Lille, CNRS, UMR 8576-UGSF-Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France |
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| Abstract: | High-energy 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 synchrotron radiation facilities, where beamlines are channeled out of the storage ring, a continuous bremsstrahlung spectrum, with a maximum energy of the stored particle beam, will be present. At the advanced photon source (APS), where the stored beam energy is 7 GeV, bremsstrahlung generated in the straight sections of the insertion device beamlines, which are a total of 15.38 m in length, can be significant. The contribution from each bremsstrahlung interaction adds up to produce a narrow mono-directional bremsstrahlung beam that comes down through the insertion device beamlines. The resulting absorbed dose distributions by this radiation in a 300 mm×300 mm×300 mm tissue substitute cube phantom were measured with LiF:Mg,Ti (TLD-700) thermoluminescent dosemeters. The 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 7-GeV bremsstrahlung spectrum. |
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