Angular distributions of photoelectrons ejected from uranium by 1.118 MeV gamma rays |
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| Affiliation: | 1. Department of Internal Medicine, En Chu Kong Hospital, New Taipei City 237, Taiwan;2. School of Medicine, Fu Jen Catholic University, New Taipei City 242, Taiwan;3. Institute of Occupational Medicine and Industrial Hygiene, College of Public Health, National Taiwan University, Taipei 10020, Taiwan;4. Department of Public Health, College of Public Health, National Taiwan University, Taipei 10020, Taiwan;5. Department of Environmental and Occupational Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei 10002, Taiwan;6. Department of Laboratory Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan;7. Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei 10002, Taiwan;8. Department of Health Services Administration, College of Public Health, China Medical University, Taichung 404, Taiwan;9. Department of Internal Medicine and Cardiovascular Center, National Taiwan University Hospital, Taipei 10002, Taiwan;1. Department of Biomedical and Diagnostic Sciences, The University of Tennessee Knoxville College of Veterinary Medicine, 2407 River Drive, Knoxville, TN 37996, USA;2. Department of Large Animal Clinical Sciences, The University of Tennessee, College of Veterinary Medicine, 2407 River Drive, Knoxville, TN 37996, USA |
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| Abstract: | At a gamma-ray energy of 1118 keV, we have studied longitudinal angular distributions of photoelectrons ejected from the K-, L-, and M+N+…-shells of uranium. The application of these angular functions to the calculation of the photoelectric correction factor ƒ is discussed. It is important to obtain ƒ at an energy such as 1.118 MeV to increase the accuracy, around 1 MeV, in the curve of ƒ versus energy. A smooth-curve relationship, in a log-log diagram, has been found between the gamma-ray energy hv and the angle θm of maximum photoelectric cross-section. It is pointed out that the Swedish computer BESK now undertakes calculations of ƒ at four gamma-ray energies: 412, 662, 1118 and 1332 keV (assuming rectangular symmetry and taking source size into account). This new calculation increases the accuracy of ƒ values such that the overall accuracy in ƒ between 400 and 1400 keV is now considered to be of the order of 1 %. |
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