A - Prevents beta radiation from reaching the film 防止贝塔射线投射在胶片上
B - Provides electricity needed to heat the filament 为加热灯丝提供电源
C - Removes less-energetic x-ray from primary beam 将初始射线中能量较弱的部分移除
D - Decreases production of scatter radiation 降低散射线的产生
E - Maintains a vacuum environment 保证环境真空