Road blocks were establicied on Ficghways 93 and 91 following shots numbers eeven and nine ef Upshot-Enothole, ‘The hifhest reading on a private muitomobile was 100 mr/hr (gamma) inside and 110 mr/hr outside at H plus 3$ hours, About 75 oars were washed (rovghly 1/8 of the total monitored). All of the ears that were washed except the one mentioned stove, had ovtaice Gose rate readings less than half of the hig-est. ‘The ratio of dose rate readings on the outside of the oar to inside varied from unity to about h/l, Probably one of the important factors here is the difference betwee; driving with windows and/or ventilators opened or closed, One bus read 250 ar/hr outaide and average ef 100 mr/nr inaide with a high inside reading ever the rear seat of 110 mr/hr at © plus & 3/1], hours. Considering the amount of time one normally spends i: an autono ile, these dose rates do uot necessarily represent a health hagard in terns of gavza doses, What is provably @ more limiting factor is the direct contan- ination one mignt acquire by rubbing against the outside of the car, especially When changing a tire, — Tt is assumed that monitoring will be accomplished outside a general radiation field. Theoretical ealowlations (Appendix D) indicate that garzma dose rate readings taken at four inoces from a surface will te 51%, hot, and 27% of those by a meter at three feet acove an equally contaminated infinite fleld wien the redii of contamination are respectively 3 feet, 2 feet, ant 1 foot. these data gucrest that wien t.e gamma dose rate readi-:g at four inctes fron @ geverally contaminated car is atout ons half t.at for an infinite pla-e taken at three feet, t.e degree of co:taninstio.: per unit °-2°50> pee pio cuenta ae 7