ON THE SELECTION OF STOPPING-POWER AND MASS ENERGY-ABSORPTION COEFFICIENT RATIOS FOR HIGH-ENERGY X-RAY DOSIMETRY
ON THE SELECTION OF STOPPING-POWER AND MASS ENERGY-ABSORPTION COEFFICIENT RATIOS FOR HIGH-ENERGY X-RAY DOSIMETRY
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DOI：
10.1118/1.595643
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发表时间：
1984-01-01
期刊：
影响因子：
3.8
通讯作者：
SCHULZ, RJ
中科院分区：
文献类型：
--
作者：
CUNNINGHAM, JR;SCHULZ, RJ
一种选择平均停止本领的方法。**图形**。和能量吸收系数。**图形**。制定了比率。 X 射线束的质量通过水中 20 厘米和 10 厘米深度处的电离室读数的比率来表征。**图形**。为了方便起见，在实验.**图形**之间建立了关系。以及加速器的标称加速电位（MV）。实验性.**图形**。与.**图形**相关。和.**图形**。分三步进行。首先，使用 60Co 至 45 MV 范围内的实验和理论光谱，.**图形**。计算了初级和首次散射光子，以及实验与计算的图表。**图形**。对于构建的这些相同的光谱。第二，.**图形**。和.**图形**。计算了大量主要光谱[其中大部分是实验性的。**图形**。不可用]并构建了一个将这些数量与.**图形**相关的图表。对于这组光谱按上述方法计算。第三，使用前面步骤中的图表，与计算的图表相关。**图表**。和.**图形**。具有实验性的.**图形**。被建造。提供了水、聚苯乙烯、丙烯酸、石墨、A-150、C-552、电木和尼龙的数据，梁的标称加速势在 2-45 MV 范围内。
A method for the selection of average stopping-power .**GRAPHIC**. and energy-absorption coefficient .**GRAPHIC**. ratios was developed. The quality of the X-ray beam is characterized by the ratio of ionization chamber readings at depths of 20 and 10 cm in water .**GRAPHIC**. For convenience, a relationship is established between experimental .**GRAPHIC**. and the nominal accelerating potential (MV) of the accelerator. Experimental .**GRAPHIC**. are related to .**GRAPHIC**. and .**GRAPHIC**. in a 3-step process. First, using experimental and theoretical spectra in the range 60Co to 45 MV, .**GRAPHIC**. were calculated for primary and first-scatter photons, and a graph of experimental vs. calculated .**GRAPHIC**. for these same spectra as constructed. Second, .**GRAPHIC**. and .**GRAPHIC**. were calculated for a large number of primary spectra [for most of which experimental .**GRAPHIC**. were not available] and a graph constructed that related these quantities and .**GRAPHIC**. calculated as above for this group of spectra. Third, using the graphs from the preceding steps, graphs relating the calculated .**GRAPHIC**. and .**GRAPHIC**. with experimental .**GRAPHIC**. were constructed. Data are presented for water, polystyrene, acrylic, graphite, A-150, C-552, Bakelite, and nylon for beams with nomimal accelerating potentials in the range 2-45 MV.