DNA 1240H-2 ahR SF = —— . @3R a hep —— E ahR - a “3R (17-21) -_ * | - do where d, >» do, and dip are defined in Eqs. 1716,17-18, & 17-21, and d3p, the dose rate at a point 3 ft above the finite slab, may be expressed: R -(ux)! aap = dp oe av (r/nr) he oO (17-22) -2 It ie apparent that, when Eqs. 17-l6to17-19, 17-21 and17-22 are used, the dose-rate ratios have the following equivalences: ~ a - ) pe” (Hx) ° av (cm) Unxe oO R_ pe? (Hx) ' av \ tax? dhr ane. FS Peed ee (ux) J lnxe — (17-23) av °o R at do ste| ° bnx® he= -3 (cm) " y, Reference 54 presents curves of the quantities needed to find the shielding factors for various h and R values. Note that Reference 54 uses the following symbols: PY BEST AVAILABLE CO 17-40 ee