水穿透厚度分数
water penetration thickness fraction
X射线穿透法
X-ray transmission method
γ射线穿透法
Gamma- ray penetration method
穿透法
Through transmission technique
transmission technique
transmission method
低能γ射线穿透法
Single low-energy r-ray transmission techniques
电磁波穿透法
electromagnetic-wave penetration method
矿井电穿透法
mine electrical penetration methods
侵彻不贯穿厚度
thickness of targets required to prevent perforation
双能γ射线穿透法
Dual energy r-ray transmission techniques
大厚度法兰
Flange with Large thickness
等间距厚度法
Equal-spaced thickness method