3.2 Deposited Matcrial in Compartments A survey of each ventilated compartment will be made under the supervision of Program 6.4d subsequent to rccovery of samples. It is intended that specific points be measured during this survey and that these points be delineated by some suitable marking prior to the actual test. If each point is measured at the same distance from the surfacc, then the relative distribution of active material throughout each compart~ ment could be plotted as a function of position in the compartment. In addition, the surface distribution of the Condition II com- partment will be supplemented by a matcrial balance between the last air sampler in the intake duct and the air sampler in the cxhaust duct. Presumably, the diffcrence betwecn the total activities recorded by these two samplers would represent the amount of activity lost to the room, provided the quantity of activity depositcd inside the intervening duct- work is obscrved to be negligible. 3.3 Airborne Activity in Compartments In the ventilated compartments information relating to the airborne activity will stem from two sources--particle collectors (Tab E-6) mounted in each compartment and air samplers (Tab E-5) located in the exhaust ducts from each compartment. Méllipore filtcrs obtained from the particle collectors will be radioautographed and the active particles will be measured to obtain an estimate of the particle size available for inhalation and ingestion. Total gamma and beta activity per unit volume of air cxhausted from the room as a function of time will be estimated from a count of the activity on the filtcr paper removed from the exhaust duct air samplers. 3.4 Nature of Active Matcrial in Ducts and Spaces 4, See Tab E~ll1. ADMINISTRATIVE AND LOGISTICAL MATTERS (Test Prevaration,Support & Rollup) .l Pretest Work at USNRDL h.l.1 Filter Paper Investigations A number of different filtering elements have been tested for pressure drop characteristics and general adequacy for use in the air sampler. Results of these tests are given in Tab E~3. 4.1.2 Model Construction and Testing ST. LGUIS FRC Air flow characteristics and deposition sitcs have been investigated by means of a reduced~scale boiler model and a full~scale 5 vee 9