NCRP Report #147 - Radiation Shielding for Medical Instalations

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Occupancy Factor, T• Shield designers allow <strong>for</strong> partial occupancyin shielded areas, with T the “occupancy”factor• T is the fraction of the beam-on time ashielded area is occupied by an individual• A barrier is acceptable if it decreases thekerma behind the barrier to P/T• Note: If T
<strong>NCRP</strong>-147 Recommended TOffices, labs, pharmacies, receptionist areas, attendedwaiting rooms, kids’ play areas, x-ray rooms, film1reading areas, nursing stations, x-ray control roomsPatient exam & treatment roomsCorridors, patient rooms, employee lounges, staff restrooms½1/5Corridor doors 1/8Public toilets, vending areas, storage rooms, outdoorareas w/ seating, unattended waiting rooms, patient1/20holdingOutdoors, unattended parking lots, attics, stairways,1/40unattended ddelevators, janitor’s closets19
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: NCRP Statement 10 (2004)• In Stat
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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