NCRP-147 Shielding Models 147 Shielding Models - Radiation ...

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New Leakage Model • Estimate thickness of tube housing by using primary beam output at leakage technique factors as model for unhoused leakage radiation. 1931 mGy/hr 100 mR/hr = 0.873 mGy/hr 1 m Tube operated at 150 kVp, 3.3 mA 1 m “unhoused” tube Tube housing = 2.32 mm Pb thick 1 m 1 m 1931 mGy/hr 1931 mGy/hr 30
New Leakage Model • Write ratio of leakage kerma rates at any kVp to L at kVp max • and knowing that at a given kVp, workload W(kVp) is the time integral of the tube current: W ( kVp) = ∫ I dt •then unshielded d leakage kerma K L (at 1 m) at that kVp is K L (0, kVp) = L kVp 2 (1 −U ) W 2 ( kVp) B housing kVp I B ( housing max ) max max kVp ( kVp) 31
Page 1 and 2: RSMI 2009 Session III Diagnostic X-
Page 3 and 4: The Three Models for Diagnostic X-r
Page 5 and 6: Primary, Scatter, and Leakage Must
Page 7 and 8: 1 st principle extensions to NCRP 4
Page 9 and 10: 1 st principle extensions to NCRP 4
Page 11 and 12: Unshielded Primary Beam Kerma KW (
Page 13 and 14: Primary Radiation: i The Old NCRP-4
Page 15 and 16: Primary Radiation: A Conservative,
Page 17 and 18: 1E+0 Primary Transmission Through P
Page 19 and 20: x pre for Radiographic Room Workloa
Page 21 and 22: Scatter Radiation patient 21
Page 23 and 24: Scaled Normalized Scatter Fraction
Page 25 and 26: Leakage Radiation Radiation origina
Page 27 and 28: Leakage radiation • These leakage
Page 29: New Leakage Model • For tube oper
Page 33 and 34: How far off is NCRP-49’s leakage
Page 35 and 36: NCRP-147 Shielding Model No. 2 •
Page 37 and 38: NCRP-147 Shielding Model No. 2 Seco
Page 39 and 40: Shielding Model No. 2 • Get the u
Page 42 and 43: B=0.0047 x=1.2 mm Pb 42
Page 44 and 45: Shielding Model No. 3 for “Repres
Page 46 and 47: Representative Radiographic Room 46
Page 48 and 49: Representative Radiographic Room Ch
Page 50 and 51: “Representative R&F Room” Chest
Page 52 and 53: • Method: “Representative Room
Page 55: NT/Pd 2 curves have been fit •The
Page 58 and 59: Equivalency of Shielding Materials

NCRP-147 Shielding Models 147 Shielding Models - Radiation ...

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