way li, 1954 ANNEX IT valovlatigns of Tose Gate at Three Feet jibove A Flane Surface Fer point source (0.3 = 3.0 Kev range) Dose rate (r/hr) 2 Bs C = wheres activity (ouries) Re energy in Kev d = distance in feet naeedquwwFeeuneeFewes hn“ Ss a2@ S&S = + |S we ww + ‘where: : = notivity/unit area = height above sarface (feet) xX = distance in feet. Nose rate fea 277 xix $h Ry : serialh2 gn? eS eue Gewese @27 &=s SB eS BS _@ wes B&B ws — oe SS ws Fo The mean free path fer 0.7 Wev in air is about 360 feet a0 that essentially a1) of tne dese will‘be con tributed from a surface 1,006 feet in radius, “ let 4210 x 10° crtes/tt? | . fe Ot Nev . 3 fose rate = 677(0,9)(20 x 6} Tn |. 3 Ze2 ar/hr Sines this formla assumes no absorption and alse a nnifors plane ourface, an ostinate ie that 10 po/tt? —— > 1 ar/hr, assesgeen sooo 714