Gonadal shielding with 0.5 mm lead-equivalent shields reduces gonadal radiation dose by approximately what percent?

Gonadal shielding with 0.5 mm lead-equivalent shields reduces gonadal radiation dose by approximately what percent?

• A. 55%
• B. 92%
• C. 80%
• D. 100%

Answer: (B)

Gonadal shielding works by attenuating the X-ray photons that reach the gonads. A shield of 0.5 mm lead-equivalent is thick enough to block a large portion of the diagnostic photons, especially the scatter that contributes significantly to gonadal dose during many exams. Under typical diagnostic-beam conditions, this thickness reduces the gonadal dose by about nine-tenths, with 92% being a representative value you’ll see cited. Of course the exact percentage can vary with beam quality, field size, and how the shield is positioned, but 0.5 mm Pb commonly yields roughly a 90–95% reduction.

Gonadal shielding works by attenuating the X-ray photons that reach the gonads. A shield of 0.5 mm lead-equivalent is thick enough to block a large portion of the diagnostic photons, especially the scatter that contributes significantly to gonadal dose during many exams. Under typical diagnostic-beam conditions, this thickness reduces the gonadal dose by about nine-tenths, with 92% being a representative value you’ll see cited. Of course the exact percentage can vary with beam quality, field size, and how the shield is positioned, but 0.5 mm Pb commonly yields roughly a 90–95% reduction.