1b bh. Period 2100, Arril 1), 1955 to 1630, April 29, 1955 CL 562—P Cl. 563-P 5. 53.5 + 3.3 don total 3hekb + 1.5 " CL 517-P Open teh é7 = 7 dom total CL 619-—{P Wiet" ub 72.0 9 Covered tub 34 Q 4 " YOO dan total Period 1190, May 13, 1955 to 1139, a 23, OL 527.2 SL GP8.P 7. Covered tub Period 1800, April 22, 1955 te 0°30, Hay 13, 1965 CJ. S18-P 6. Open tb Oman tub Covered tb SO + 5 dm total 7O+ © " Period 1700, Mav 23, 1955 to 1930, due 6, 1°55 CL 68 CL CUS CL 6h4 Goon trib Covered ub "Yet" two 210 + € ha total e390 x 12" " Zod = & " The asreement in total Sr°O activity collected by each of the several wtanors is ratifrinz. The only signific :nt diserevency is the lov value for CL 563-P * ich micht be explained by tie occurrence of a very hoavy rainzall “th a possinle resultant loss of sanple due to snlashing off the >olastic cover, Another nossibility is the oceurrerce of arv fallowt which conld heve been bloym off the plastic cover by surface winds. It asnears that the Sr7? ic weter svlwile at the time of collection and is net absorved on the walls the vessels, It is further indicated that once cenosited in rains, the Sr7O Yellout does not blow around si ieantliv, « NYOO These results testify to the adequacy of the water collection and cienical seraration vwrecetures used and indicate tnat an cnen tub provides for rejliarle colicetion of vreei-itaticn for extended rericds of time. Since the Sr acti- vity is ewmarentiv cuite soluble, large voiune coilecticns can .e se aliguotted to reduce the saanle shivme-t vroblem, Thus, the collection of orecinitation an ears to be a practicabl: metiod to aug-rent, or even revlace, the sticky paper collector as a general inthod of vorld -ride monitoring Ss