te ray hy 205 frets ASSEX IT Calc:lationn of Tose Rate at Tiree Feet Above A Flano Surface For point source (0.3 ~ 3,0 Nev rance) Tose rate (r/hr) = oh C = activity (curies) where TP ew fe ee SR we ee E = enerry in lev d = cistance in fect ote wwe eee Dose rate ~ GFA 27rdx he $ x2 where: A = activity/untt area h wz height above surface (feet) xX = distance in fcet Ra . a es cane 40K Tose rate = era “\ phe crus nasi we ne ee eee ee eee eeee The rcean free path for 0.7 Mev in air is cbout 3M feet co that ascentially all ef tue dose will be contributed fron a surface 1,000 feet in vadiuga, tet A= 10 x 10° crries/rt2 = 0,7 ev Tose rate = €7°(0.7)(10 x 0) raf gic by ~/ = 2,2 mcfhr Since tig forcula assures no abcocption end also a uniform plane urface, an estirate is tat 10 pele? ——>1:isfir,