VENT ANT relationship to the surface qose and depth close as does the air dose measured iia “pont scarce beam in the elime or laberatory. b DRS RTP EO GN © X POSED GROUPS mtg Pte ope re Pet Wollics [: fee gf PER CENT AIR DOSE AT SURFACE Lee H. -- = 4 oe zor cutk, Grroup PV oo. lle ee wor oe ce ee ve 100 ~ oo . — — 260 9 0.2222) Rongertk, (rroup PLD hat the miucdline cose, rather than dose measured ioaie. waadd de the 100 enim air doses with comparable bio- etfect ire Gbtaamed : Ronyelup. (rroup To. -Lilingraae, Grroup [IL-2 appear under these cirewistam es and in riost experimental conditions 9 cee yo ({ am : dee 477 EXPOSURE, MANY SOURCES 35 arn 6 BILATERAL EXPOSURE, DIVERGING SOURCE 39% 7 XN “ | 1g thin 9 se 5 10 i$ 20 | 4 23 30 tf ~ ™ 36 CM MASON! EF DEPTH DOSE DISTRIBUTION IN CYLINORICAL PHANTOM, co FACILITY, (NMR 1} FIGURE j.¢—'omtpariwon of depth foe onrpes in maroniuec Milatera: erposure tu a vingle powd saucre. ninitipl: eoureos Uith a wpRherions better common pariumete! i fermis of whieh t predict biological «ect. (op fais assumption the air dose values -tated in Table 1... stroula tye multiphed by approxwm: LEeTV oc. 1b order ot compare their effects 1 those of a given air dose from a “point sour o beam eometry Ge livered dilateraily. If ais os ddone. assume wu fallout of Ie 381712 O a6 Hours. he fe Tow mer ot pean phantoms from mad ximultaneous exposure to fuattr ation aretnd the phantom. Poe seometry of radiation from a fallout held not jdenrical either to the geometry of bicateral point sources or spherically distributed «curves since the plane source delivers the radiaerazing angle. However, the varge dy ato mit tetal iesd situation is better approximated by 4fothuaby pline geometry. lxposure geomrs.) pu diouetive cloud would be spherical. hon