0.33 R/h在距離此射源5公尺之外的曝露率為0.33/(5)2=0.0132R/h=13.2mR/h
13.2mR/h x 1.2 x (0.5)n < 0.05mR/h
(0.5)n < 3.16-3
n約等於8.3,故半值層厚度=8.3 x 4.8 =39.84 cm
補充
(0.05/15.8)=0.5x
按法:0.05/15.8=按ln除以0.5按ln按=
72.已知距離活度1 Ci的137Cs點射源1公尺之外的曝露率為0.33 R/h..-阿摩線上測驗
This is a large modal.