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

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1 st principle extensions to NCRP 49 • The models for primary, scatter, and leakage in NCRP-147 are extensions to what’s in NCRP- 49 (1976): – x-ray tubes operating over ranges of potentials (“workload distribution”) – new model for image receptor attenuation – new model for leakage 6
1 st principle extensions to NCRP 49 • These primary, scatter, and leakage radiations may be from multiple x-ray sources (or tube positions) • So, simply add up all the contributions to the kerma, K, from all these sources in the occupied area behind a barrier of thickness x, K ( x) = ( K ( x) + K ( x) K ( x) ) ∑ ∑ + tubes kVp P S L 7
Page 1 and 2: RSMI 2009 Session III Diagnostic X-
Page 3 and 4: The Three Models for Diagnostic X-r
Page 5: Primary, Scatter, and Leakage Must
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 and 30: New Leakage Model • For tube oper
Page 31 and 32: New Leakage Model • Write ratio o
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
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