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Effective Shielding Calculations for X-Ray Room Optimization

Determine lead & concrete thickness for optimal X-ray room shielding, following dose constraints and transmission coefficients. Calculation required for room usage specifications and safety compliance.

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Effective Shielding Calculations for X-Ray Room Optimization

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  1. Example Outside (Car Park and seating) Wall A 4.2m 1.3m Wall D Wall B 2.1m Offices 1.1m Waiting Area (not attended) 3.8m Operator Area Wall C Distance to ceiling from table – 2m Offices on floor above Corridor not drawn to scale

  2. Example – Exposure Details • Only two investigations in this room • AP Abdomen (patient supine on table) • DAP – 6.5 Gy.cm2 • 30 examinations per day • AP Pelvis (patient supine on table) • DAP – 5.5 Gy.cm2 • 20 examinations per day • All exposures at 100 kV • Room in use 5 days per week, 52 weeks per year

  3. Calculation required • Thickness of lead required to shield walls adequately (specify as lead code). • Thickness of concrete required to shield ceiling adequately. • (note, this is a ground floor room with no basement) • Assuming a dose constraint of 0.3mSv per annum

  4. X-ray transmission through lead

  5. X-ray transmission through concrete

  6. Coefficients for empirical formula at 100 kV

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