PT - JOURNAL ARTICLE AU - Simmons, Guy TI - Structural Shielding Design and Evaluation for Medical Use of X-Rays & Gamma Rays of Energies Up to 10 meV. NCRP Report No. 49 DP - 1978 Feb 01 TA - Journal of Nuclear Medicine PG - 228--228 VI - 19 IP - 2 4099 - http://jnm.snmjournals.org/content/19/2/228.short 4100 - http://jnm.snmjournals.org/content/19/2/228.full SO - J Nucl Med1978 Feb 01; 19