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Example

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. Example – Exposure Details.

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Example

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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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