van der Linden P M
Strahlentherapie. 1979 Jul;155(7):470-6.
The dose distribution in water around a CDC.J 137Cs tube is calculated with a computer. In the transverse direction the calculated dose rates showed to be almost unsusceptible for the value of the platinum absorption coefficient. In the longitudinal direction, however, the value of the linear absorption coefficient plays a more prominent role. An effective absorption coefficient for the filter material was determined by measurement, using a photographic film. This was done by relating the filmdensity along the source axis with the filmdensity along the transverse axis, where the dose rate is well known. In this way an effective linear absorption coefficient for platinum was obtained which gives a good agreement between the experimental and theoretical results. For use in a computer program for clinical use, the dose distribution around a cesium tube has been calculated in a specific spherical coordinate system using 101 radii.
利用计算机计算了一个CDC.J 137Cs管周围水中的剂量分布。在横向方向上，计算得到的剂量率显示出对铂吸收系数的值几乎不敏感。然而，在纵向方向上，线性吸收系数的值起着更显著的作用。通过使用摄影胶片进行测量，确定了过滤材料的有效吸收系数。这是通过将沿源轴的胶片密度与横向轴上剂量率已知的胶片密度相关联来完成的。通过这种方式获得了铂的有效线性吸收系数，它使实验结果与理论结果之间取得了良好的一致性。为了用于临床的计算机程序，已经在一个特定的球坐标系中使用101个半径计算了铯管周围的剂量分布。
