Williams P C
Phys Med Biol. 1980 Jan;25(1):77-84. doi: 10.1088/0031-9155/25/1/007.
The absorbed dose conversion factors, C lambda, were introduced, by Greene and Massey, as an interim measure until a primary standard for high energy photon dosimetry could be established. The theoretical basis of these factors has been discussed extensively and a more rigorous definition has emerged. Experiments have been carried out to determine the values of C lambda, for a Tufnol walled, Baldwin-Farmer ionisation chamber over a range of energies from cobalt-60 to 12 MV. The experimental results, based on measurements with a calorimeter, presented here support the more rigorous definition but it is shown that the values obtained depend, to a small extent, on the assumptions made about the detailed construction of the ionisation chamber for which C lambda is measured.
吸收剂量转换因子Cλ由格林和梅西引入，作为一种临时措施，直至能够建立高能光子剂量测定的 primary 标准。这些因子的理论基础已得到广泛讨论，并出现了更严格的定义。已开展实验来确定在从钴 - 60 到 12 MV 的一系列能量范围内，用于涂覆 Tufnol 壁的鲍德温 - 法默电离室的Cλ值。此处给出的基于量热计测量的实验结果支持更严格的定义，但结果表明，所获得的值在一定程度上取决于对测量Cλ时所用电离室详细构造所做的假设。 （注：原文中“primary standard”未明确其准确中文含义，暂保留英文，可根据具体专业领域进行准确翻译，比如“原标准”等 ）
