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the alpha plateau and then on the beta p lateau. plotting the ratios of the <br />two counts vs. density thickness. The a lpha amplification factor (E) from <br />that curve is used to correct the amplified alpha count on the beta plateau <br />When sigm fl cant alpha activity is indicated by the sample count at th <br />alpha voltage plateau. the beta activity of the sample can be determined b <br />counting the sample at the beta voltage plateau and calculating the activit <br />from the following equation: <br />Beta (pCi/liter) _ (B - AE) x 1.000 <br />2.22xDxV <br />where: <br />B = as defined above. <br />D = as defined above. <br />A = as defined above. <br />E = alpha amplification factor, read from the graph of the <br />ratio of alpha counted at the beta voltage/alpha counted <br />at the alpha voltage vs. sample density thickness. <br />V = volume of sample aliquot (mL). <br />2.22 = conversion factor from dpm/pCi. <br />7.7 Errors associated with the results of the analysis should also b <br />reported. <br />8.0 QUALITY CONTROL <br />8.1 All quality control data should be maint ained and available for easy <br />reference or inspection. <br />6.2 Employ a mim mum of one blank per sample batch to determine i <br />contamination ~s occurring. <br />8.3 Run one duplicate sample for every 10 samples. A duplicate sample i <br />a sample brought through the whole sample-preparation and analytical process. <br />8.4 Spiked samples or standard reference mat er~als shall be periodically <br />employed to ensure that correct procedures are being followed and that al <br />equipment is operating properly. <br />e <br />Y <br />Y <br />e <br />f <br />s <br />9310 - 7 <br />CD-ROM Revision 0 <br />Date September 1986 <br />