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

Leakage radiation
• NCRP-147 calculations (and shielding methods
2 and 3) use
– 3.33 mA at 150 kVp
– worst case leakage rates
– (Subsequently, we’ve found that assuming 4 mA at
125 kVp leakage technique factors specifies
barriers that are 10-20% thicker than in the report)
– However, actual leakage rates are 0-30% of the
maximum leakage so we don’t see a problem
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