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Show TABLE 1 FLOW CONVERSION CONST ANT Prior to 19 April 1969 Velocity thru tunnel 10 mph = 448 cm sec -1 Tunnel diameter - 14'' = 35. 5 cm Area = 990 cm Volume flow= 4. 43 x 10 2 5 cm 3 sec-l Subsequent to 19 April 1969 Velocity = 6 mph = 269 cm sec Volume flow = 2. 66 x 10 magnitude with a mean output of about 10 10 5 cm 3 -1 sec~ 1 nuclei sec -l No definite trends of outputs with ambient conditions are noted, although the tests were made under conditions ranging from 63°F and clear skies to 26°F and snowing. The results of one series of tests from the 1967-68 season are presented in Table 3. Note that the nuclei liter- 1 values for -20°C and a 1 cc sample are of the same order of magnitude (335) as the results obtained for a 1 cc sample during the tests of 1969. Figure 8 displays a plot of an earlier test run , as well as the calibrations of the Park Range Project generators done at CSU. The field test values from 1969 at 10 10 nuclei second- 1 , if correct, fall well below the 1012 -1013 nuclei second- 1 values determined in the laboratory calibrations. As in the tests during the 1967-68 season, a few tests run at -15°C with the same technique used at -20°C produced no count levels significantly above background. These results are apparently due to characteristics of the nuclei counter at these temperatures. Other evidence, from downwind nuclei and precipitation sampling, indicates however, that actual release rates did approach 1013 nuclei sec- 1 . 15 |
