Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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Neutron Measurements• Bonner sphere system to measure thefluence from which the neutronspectrum is deconvolved.Howell et al (2006)
Neutron Measurement Cautions• Gold foil activation – not for everyone.• NIST traceability• Still the “gold” standard• Low doses = very low rdgs.• Increase in uncertainty <strong>of</strong> measurements• Long exposure times• Need for multiple rdgs. along patient plane.• Measurement variability among the differentneutron dosimeters• Difficulty measuring the neutron dose at depth ina patient
Page 1 and 2: Appropriate Planning inRadiation On
Page 3 and 4: Secondary Cancer Risk in Radiation
Page 5 and 6: Calculations of Risk withEarly IMRT
Page 7 and 8: Dose Levels in RT Patients (3D CRT
Page 9 and 10: Two Ways to Determine Absorbed Dose
Page 11 and 12: 3D VIP-Man Model fromthe Visible Hu
Page 13 and 14: Comparison of Calculated and Measur
Page 15 and 16: Results: Total (Photon + Neutron) O
Page 17 and 18: Monte-Carlo Calculations: Summary
Page 19 and 20: Most Recent Measurements• Anthrop
Page 21 and 22: Pediatric Procedures• Pediatric C
Page 23: Neutron Measurements• Neutron flu
Page 27 and 28: Risk (%) of Secondary Cancer perCom
Page 29 and 30: Dose Equivalent and Risk (%) perCom
Page 31 and 32: How significant can this be?Stray R
Page 33 and 34: Comparison of the doses in the pedi
Page 35 and 36: Take Home Message• Biggest uncert

Out of Field Dose Reduction by Geoffrey Ibbott, PhD

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