Laserfiche WebLink
5 . Perform a Background Check by placing t^:e teflon blank .within the <br /> circular window. Label the analysis as "'HK-nKG After shooting <br /> the teflon blank check the resuits . The results should be less than , <br /> three t'_^es the standard deviation. <br /> - If the results are higher than three times the standard <br /> deviation then perform a background adjustment" . Three <br /> samples are called for by the routine: QUARTZ, TEFLON <br /> and NOTHING. The first two are provided by the <br /> instrument and should be analyzed like the sample cups. <br /> The NOTHING sample is nothing on the probe except the lab <br /> stand shield cup to prevent the escape of radiation. <br /> III. QUALITY CONTROL CHECKS AND ANALYSIS <br /> * This check and analysis sequence is recommended for all uses of the <br /> Spectrace instrument where data will be reported. <br /> *-* QC sample analysis should be analyzed under the same conditions as <br /> sample analysis. Refer to the Spectrace SOP for HDL and other <br /> details. <br /> 1. Analysis times should be set, at a minimum, for 30 seconds on each <br /> source. Generally a 60 second analysis time is recommended for the <br /> primary source. <br /> 2. A reference standard-near- tti&method.-tiatection..linin (DLCS) should <br /> be analyzed. Label - L-Std-<standard name>. <br /> 3. A reference calibration standard nearthe action.level (ALCS) should <br /> be analyzed. Label - M-Std-<standard name>. The determined M-Std <br /> concentration (or corrected concentration) should be within 20 <br /> percent difference of the known value. <br /> 4. Aulacid-washed sand blank should be analyzed. Label - S-BLK. <br /> 5. A pef3•=mince sample of known target analyte concentrations should <br /> be analyzed. Label - P-STD-<standard name>. Optional aualysiS. <br /> 6. After steps 1-5 have been completed, sample analysis may begin. <br /> Multiple measurements are recommended since an average of multiple <br /> measurements will decrease the sample related error caused by sample <br /> heterogeneity. Remember, if multiple measurements are averaged, the <br /> measurements are considered one sample analysis. Sample <br /> designations should begin with an S and then give coordinates and <br /> sample depth (eg. S-1OS15W-1) . <br /> 3 <br />