γ辐射屏蔽理论和屏蔽技术的发展,促使γ辐射屏蔽防护更加有效、经济和简便。在许多专著中都有γ辐射的屏蔽计算图表,但大多数图表都是以通用方式编制的,必须首先计算“减弱倍数”或“减弱因子”之后才能使用。虽有少数文献将γ射束远距治疗机的工作负荷、距离、屏蔽等因素综合编制成专用的屏蔽计算用表,但没有提供相应的计算 Gamma radiation shielding theory and shielding technology, prompting γ radiation shielding more effective, economical and simple. In many monographs there are gamma radiation shielding calculation charts, but most of the charts are prepared in a general manner, you must first calculate the “reduction factor” or “attenuation factor” before use. Although a small number of documents synthesize the working tables of shielding calculation with the work load, distance and shielding of the γ-ray teletherapy machine, no corresponding calculation is provided