NCRP Report #147 - Radiation Shielding for Medical Instalations

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CT Scanner Shielding: Overview• Estimate unshielded weekly kerma in occupiedarea near scanner, K un– Use DLP and # patients to state workload• Know P/TP / T• Barrier requires transmission B =K• Get barrier thicknessun– Simpkin Health Phys 58, , 363-7: 1990 (refit inNCRP-147)• More from Bob Dixon tomorrow40
Result: CT Scanner in a Shielding CaveLight-weightconcrete floors/ceilings are oftentoo thin!“Normal” wallshielding to 2.1 mADD Pb to ceiling(~1 mm)CTScannerADD Pb towall above2.1 m (~1mm)typ 3 mADD Pb to floor(~1 mm)41
Page 1 and 2: RSMI 2009Session II - General Conce
Page 3 and 4: Preliminaries• “Thank You” to
Page 5 and 6: Madeline Jean Simpkin, born July15,
Page 7 and 8: I’m No Philosopher• I’m here
Page 9 and 10: Background…And this place is back
Page 11 and 12: NCRP Report #147• NCRP Report #14
Page 13 and 14: NCRP-491976Design Goal, PControlled
Page 15 and 16: P=0.1 1 mGy/y for Uncontrolled area
Page 17 and 18: NCRP Statement 10 (2004)• In Stat
Page 19 and 20: NCRP-147 Recommended TOffices, labs
Page 21 and 22: X-ray Beam Transmission•For a giv
Page 23 and 24: Archer Equation for Transmission Cu
Page 25 and 26: Archer Equation for Transmission Cu
Page 27 and 28: Workload, W• W is a measure of th
Page 29 and 30: Workload, W• To determine W used
Page 31 and 32: Workload Survey• Found total W to
Page 33 and 34: Workload Distribution, W(kVp)• Ge
Page 35 and 36: General Radiographic RoomWorkload D
Page 37 and 38: NCRP-147 Models for DiagnosticX-Ray
Page 39: The Three Models In NCRP 147• cf
Page 43 and 44: Surveys of X-ray Shielding• After
Page 45 and 46: NCRP Report #147 Conclusions I• D
Page 47: NCRP Report #147 Conclusions III•

NCRP Report #147 - Radiation Shielding for Medical Instalations

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