» B, Washington, D. 53 C. Collected at the Naval Research laboratory. Samples were taken by direct fall into galvanized tubs on the roof of one of the NRL buildings. The precipitation in inches is that reported by the local Weather Bureau station for the period of sample collection, > (See also air filter, gummed paper, and platinum screen collections made at the same location and during the same period.) Table XII Sr90 CONCENTRATION, NRL RAIN COLLECTIONS, WASHINGTON, D.C. Sample Number Precipitation Collection Period Volume* D.P.N. sr70 (Liters) Total DeP.M./ft2 CL 488-P 0,h2" rain 1045-1200, 2/11/55 10.05 61.5+ 5.1 10.61 + .88 CL 489-P 0.2" rain 130-1600, 2/22/55 3.50 ie + 209 §=7065 + 250 CL 490-P 0,61" rain 0100-1030, 2/23/55 8.37 28.2 + 2.2 4.86 + .38 CL 491-P 1.3" snow 1445-1830, 2/2h/55 3.47 26.14 1.3 50+ .22 CL 492-P 0.1)" rain 030-0900, 2/27/55 1.67 13.8+ 0.8 2.36 + .14 CL 493-P 0.23" rain 0900-1200, 3/1/55 3.28 8.04 2.9 8.27 + .50 CL L94-P 0.55" rain 2000, 3/4—0L00, 3/0/95 9096 he + 525 16.22 + 295 0.69!" rain 2300, 3/5~-1500, 3/6/55 11.3 2" snow 0.22" rain 0,09" rain CL 495-P 0,13" rain 1200-1900, 2/11/55 2015-2330, 3/3/55 1900-2100, 3/5/55 3.32 1025-1215, 3/21/55 1.70 30.2 + 261 5.21 + 436 CL 496-P 0,2" rain . 1300-1700, 3/15/55 4.20 58.5 + 3.5 10.01 + .60 0,06" rain 0530-1700, 3/16/55 0.15" 1515-15),5, rain 3/16/55 1.85 CL 497-P 0.19" rain 03),5-0815, 3/18/55 2.70 80+ 2.9 8.27 + .50 CL 498-P 0,58" rain 0230-1100, 3/21/55 8.95 60.7+ 3.0 10.48 + .52 0.36" rain 0100-0900, 3/22/55 4.50 . dl Total * Collections made collection area, 86.5 x 1,8 in two new galvanized #2 wash tubs, 5.8 square feet DOE ARCHIVES | (3!