NCRP Report #147 - Radiation Shielding for Medical Instalations

More documents

Recommendations

Info

Workload, W• The shielding methods in <strong>NCRP</strong>-147 (and,indeed, <strong>NCRP</strong>-49, -34, etc, back to the1950s) are based on a presumption of theworkload of the x-ray source• Cl Calculation lti scheme:– Given the workload & distance, predict theunshielded kerma in the occupied area– Given the transmission, determine the barrierthickness that decreases this to P/T26
Workload, W• W is a measure of the x-ray tube’s use• W = the time integral of the tube current• Units: mA·min per week (= mAs/60)• W ∝ # electrons hitting x-ray tube anode• To be useful, must know or assume theoperating potential l(kV (kVp) at which htheworkload occurs27
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: Archer Equation for Transmission Cu
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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?