I — —_ te very nature of t.e weat ering factor maces Cis a difficclt paramter to evalvate. the pro ability of oecurre.ce of precipitation and/or winds avd to what degres “as to ive eatinated ag well as their effects on radiation levels, Leaching effects were studied on soils a out 130 miles from ground sero where fallout cad occurred during Opxiot-“not ole, Dose rate readings were insignificantly lower than tose predicted ty radiological decay according One exarple of tie effects to t72+2 arter a period of morg tan one ycar, of winds whe. was o. served during Epshot-Knoticle, The fallout from the Kare. 17, 1953 detonation was in @ long narrow pattern to tie east of ground sero, The second day after fallout a@ rather stron surface wind tlew almost at right angles across the area, for g out a period of a day. Tose rate readings were taken on t-e first and fourt> days at te same locations and t:en were Gomered, T 6 fourt: day dose rates were less, ‘y factors of tiree to six, tian tiose to ‘e expected from t.e first days readiics, Lased on rate of decay of t~1-2, (Otrer fallout measuresents indicated tiat the rate of decay of tis fallout material was not significantly different roc “tas. . /S