’ ten eeepeg rpm ' ‘ “ae — ard ate, OI OTTepee eee“Seeee EE pate scans pee ere —— eee 2 0 Me ag Pe tt nee See eee wa Th te eee SeemFe RR aR UE RNA A RTENea ON IN CE weye wy Legk ke Thats po te esl wees se ae Deed Ls topes dineeataee wen Pel let dat og he A Milipore Liter aus added asa ft Stage t@ Collect ary partic’ S ttat might stull be entrained im the airstream. . The caileciten characteristics of the campilng head were Eateruatzedo adjusiing ihe airflow threagh the head to 2.0 ft'/raia and exposing it to necosols of cioety! pittalate for several rarsow Fangs of particie sine (Figure 2.5). Wall lossec were determinedhy cxpooure cf the camper to an xerpeol doving a wide range of particle sizes anJ tagged wih radizactivity. These 221i losses werefezad to be approximately 4 pereeat of the total activity passing through 2 samplicg beet, teorder tu asistcs sir vetositios through cath stage equal te che calibsativa volor2t i was necosacry to uc2 aw oaction antl thet wuld maintaia the calibration ativw od 7.6 HSy/aaiia oves the renge of pressure drop caused by fier leading. The A.C. Schmidt 2-AFR coratant- flow suction unit with 2 capacity af 1.5 12/min (Figure 2.4) vas weed for this purpose. The | suction unlt was adjusted prior to shot time to pump 1.0 tein as measured by a Flowrator, which waspreviously caliwated with a wet-iest meter. The principle of ereration of the Schmiet constant-flow axit is the sarce 25 that of the NRDL 1O-RYroin coaciam-flow suction unit (Figure 2.3). . Fee ees wer noe wre yee eee ~ we ge st eee eeene cremeee me meee . aan oe ee ne etcn nee ae A typical incremental air sampler atation #s shown in Figare 22. The 12 liter/mta perp ieee? f and battery-powered sarepiershown were Inetalled but did ant operate. The supporting irame+ work for each station was shack-mounted, and sampling orifices were nypreniraately 4 feet 2484 4 Antrals. " Getnoa pigs znd izice were used for the inbabition stuxtics. “the ainimests were approdi catefy 3 actos ald at the (base of expoewre. * The avecacge weight of tie cvirea ’ pigs was agiraxizately 205 crams. The average weinht of the mice eas approximaisly 1S Grass, A t.icd of 142 gainea pigs ar 2 116 vateJc wore shinee’ by air fo the tect site, where Ciey Weise “sued taa Fortrble facilites| T= ky Ge by J-fon tacts 2 tks) under couirciles _ COaditions of temeratere and humidity. A stmlinr mait was ited ta bonne ee contracted anfecwis afier renwvasy. Exch aniges! ctatien [“.2-re 2.9) consistad of tarce ergts, each pustitioned ints foor coctions, A Brine pig was pinecd in each @ ES ecctions, Ave mice in exch of tho temeinivy tum erections, The cages in the four clarad campartments were cquizped wit’a a cooling system Cesigned te . pass chilled weter taroogh tubing wgtapiatied on the twa golid-siie pancis of each cage. A ‘emperature-sensing elet.ert was moznted ia the center caze cl each sintios to control the water cirevlation. Yigure 2.3 is a echematic dlagram of the coding sysiem, which alse cesved al GITR cootitg cots. This method of ccoling was atopted£6 22 29 persall the aulmuls to iese body heat by co.iuction, elimirating the need for endewirable -<> nooversent. Drip-type water bovtles, whith required toe animals to Lick each-crep from the ~d of 2 small tute, were InStalled in eack cage tm each 2 roanner as to ratniivize coutuminction of the water supzly. Tu ” ensure that luterii2} contamination could resull cnly from inhelslion, xo food was previc d for the animals. The znalmal cages were mounted approriiaaisly 4 feet above the deck. This height was dictated by practical mounting considerations. . 2.1.5 Surface Samplers. Strips of salt-water-sensitive film (4, by ¥ inch) were affixed to -metal plates the size cf microscope slides (1 by 3 inches}. Two 'j-iach circular holes were cat fu each plate to permit examination cf the film under a micrescops. The plate-gnd-film “units were attached to deck, bulkhead, and crerhecd surfaces with tape. The sampting area’ - Was approximately 2 fot. Details of film preparation and eciibratioa for drop size determina~ tion are given in Reference 19. 2.1.6 Temperatere-Iamidity Recorder and Courting Apparatas. Berdixn Fries hygrothermogvaphs, wilaa temperziure range of 16° to 110° F and a relative bumicity range of 0 to 100 percent were inslailed tn each test corpartment. These are stock instra nents requiring fm | power; the recorder drum is driven by 2 7-day clock rerchanism., : ° . .