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<br />TABLE 1 <br /> <br />. <br /> <br />FLOW CONVERSION CONSTANT <br /> <br />Prior to 19 April 1969 <br /> <br />-1 <br />Velocity thru tunnel 10 mph = 448 em see <br /> <br />Tunnel diameter - 14" = 35. 5 em <br /> <br />2 <br />Area = 990 em <br /> <br />5 3 -1 <br />Volume flow = 4.43 x 10 em see <br /> <br />Subsequent to 19 April 1969 <br /> <br />-1 <br />Velocity = 6 mph = 269 em see <br />5 3 -1 <br />Volume flow = 2. 66 x 10 em see <br /> <br />magnitude with a mean output of about 1010 n~clei see -1 <br /> <br />'" <br /> <br />No definite trends of outputs with ambient conditions are noted, although the <br />tests were made under conditions ranging from 63"F and clear skies to 260F <br />and snowing. The results of one series of tests from the 1967 -68 season <br />are presented in Table 3. Note that the nuclei liter-1 values for -20"C and <br />a 1 cc sample are of the same order of magnitude (335) as the results ob- <br />tained for a 1 ce sample during the tests of 1969. <br /> <br />Figure 8 displays a plot of an earlier test run, as well as the calibra- <br />tions of the Park Range Project generators done at CSU. The field test <br />values from 1969 at 1010 nuclei seeond-1, if correct, fall well below the <br />1012 -1013 nuclei second-1 values determined in the laboratory calibrations. <br />As in the tests during the 1967 -68 season, a few tests rurr at -15"C with the <br />same technique used at -20"C produced no count levels significantly above <br />background. These results are apparently due to characteristics of the <br />nuclei counter at these temperatures. Other evidence, from downwind nu- <br />clei and precipitation sampling, indicates however, that actual release <br />rates did approach 1013 nuclei sec -1. <br /> <br />~ <br /> <br />15 <br />