NCRP Report #147 - Radiation Shielding for Medical Instalations

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NCRP Report #147 has methods to limitiradiation levels to the “Design Goal” P• P = permitted radiation level in theoccupied area. P is a variable.• For the report, P must be consistent withdose limits in NRCP Report 116, which setsthe maximum effective dose equivalent– Which can’t be measured– Is highly photon energy-dependent• P in NCRP-147 is a kerma value12
NCRP-491976Design Goal, PControlled AreaUncontrolled Area50 MGY/Y5 MGY/Y= 1 MGY/WKFraction ( =½) ofNCRP-116’s 10 mGy/ylimit for new operations2004 = 5 mGy/y (~matchesfetal dose limit)= 01 0.1 mGy/wkNCRP-147EffectFactor of 10decrease= 0.1 MGY/WK1 mGy/y yy= 0.02 mGy/wkFactor of 5decrease13
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: NCRP Report #147• NCRP Report #14
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 and 40: The Three Models In NCRP 147• cf
Page 41 and 42: Result: CT Scanner in a Shielding C
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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