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2. National Council on Radiation Protection and Measurements (2005) Structural shielding design and evaluation for megavoltage X- and gamma-ray radiotherapy facilities. NCRP Rep. 151, Bethesda.
http://www.ncrppublications.org
3. National Council on Radiation Protection and Measurements (2004) Structural shielding design for medical X-ray imaging facilities. NCRP Rep. 147, Bethesda.
http://www.ncrppublications.org