Ing H, Shore R A
Med Phys. 1982 Jan-Feb;9(1):34-6. doi: 10.1118/1.595067.
Monte Carlo calculations have been made to determine the energy delivered to a phantom by neutrons escaping from the head of a Varian Clinac 35 medical accelerator at an SSD of 1 m. The energy was sorted into two regions: inside and outside a volume defined by a circular beam of area 100 and 600 cm2. For the two beam sizes, the energies outside the treatment volume were 12 and 8.7 g-rad (per photon rad) respectively. Room scattering increased these values by about 20%. These energies are smaller than those delivered by scattered photons by more than ten times.
已进行蒙特卡罗计算，以确定在源皮距为1米时，从瓦里安Clinac 35医用加速器头部逸出的中子传递到模体的能量。能量被分为两个区域：在面积为100平方厘米和600平方厘米的圆形射野所定义的体积内外。对于这两种射野尺寸，治疗体积外的能量分别为12和8.7克镭当量（每光子拉德）。机房散射使这些值增加了约20%。这些能量比散射光子传递的能量小十多倍。
