Groth M J
Department of Diagnostic Physics, Royal Brisbane Hospital.
Australas Phys Eng Sci Med. 1996 Sep;19(3):160-7.
Empirical dose rate shielding design data for lead and concrete barriers are presented for the radio-nuclides Tc-99m, I-131, Ga-67, T1-201, and Mo-99 for calculating occupational radiation exposures in Australian nuclear medicine facilities. These data have shown that the radiation dose rates received from stored radio-pharmaceuticals can be substantially higher than those calculated using the radiation dose rate and attenuation data provided in most nuclear medicine texts. The primary causes of the increased radiation dose rates are forward scattering (all nuclides), radiation hardening by selective absorption of low energy photons in lead shielding (Ga-67, Mo-99 and I-131) and contamination by radio-nuclides emitting high energy photons (T1-200 in T1-201).
给出了用于澳大利亚核医学设施中计算职业辐射暴露的针对放射性核素锝-99m、碘-131、镓-67、铊-201和钼-99的铅和混凝土屏蔽层的经验剂量率设计数据。这些数据表明，从储存的放射性药物接收的辐射剂量率可能大大高于使用大多数核医学教材中提供的辐射剂量率和衰减数据计算出的剂量率。辐射剂量率增加的主要原因是前向散射（所有核素）、铅屏蔽层中低能光子的选择性吸收导致的辐射硬化（镓-67、钼-99和碘-131）以及发射高能光子的放射性核素的污染（铊-201中的铊-200）。
