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

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NCRP-147 Shielding Model No. 2 • For single kVp operation cf. Simpkin and Dixon Health Phys. 74(3), (), 350–365 for secondary kerma per workload at 1 m at single kVp operation • All other data is available in NCRP 147 – But be careful reading scientific notation: 1.234 x 10 1 = 12.34 38
Shielding Model No. 2 • Get the unshielded kerma, K(0), by scaling the kerma per patient at 1 m, K 1 , by – N patient procedures (suggested values of N are in Table 4.3) or, equivalently – total workload W tot (where workload/pat = W norm ) – can tweak W tot by a QE-specified different workload per patient, W site • Kerma is then 1 K U N K( 0) = = 2 d K – (where U is replaced dby 1 for secondary barriers) d 1 2 U W W tt tot norm 39
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 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: NCRP-147 Shielding Model No. 2 Seco
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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