primary beam energy [物] 一次束能量

primary beam transport 初始束流输送

absorption of primary beam 一次射线束的吸收

non-primary beam 非主射束

primary beam theory 初等梁理论

primary beam shaping 初始束流成形

degraded primary beam 减量原射线

primary beam divergence 原束发散度

primary beam attenuation 主束衰减