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Radiation Protection <br /> Standard Operating Procedure <br /> TZTI,E~ Alpha Contamination Surveys <br />tiu~:ber <br /> 4.2.1 If the meter needle does not respond in the "BAIT OK" <br /> range, replace the batteries and reca.librate (Ref.-1). <br />4.3 Turn the range selector to the "XS" position. <br />4.4 Place the detector on a clean piece of paper. <br />4.5 Allow the meter to stabilize (at least SO seconds), then <br /> note and record the average background reading on the survey <br /> form. <br />4.6 Place the detector on the alpha source. <br /> 4.6.1 Turn the range selector switch to the proper scale <br /> ("X1", "X10" or "X100", as appropriate) to assure that <br /> the reading is within meter limits. <br />~ 4.'7 Allow the meter to stablize, then note and record the reading <br /> <br />( on the survey form. <br />' 4.8 Subtract the background reading(Step-4.5) from the source <br /> reading (Step-4.7), and record the results. <br />4.9 Compute the detector efficiency by dividing the results of <br /> Step-4.8 by the total source activity (alphas per minute). <br />4.10 The results of Stap-4.9 should be within plus or minus 15~ ~ <br /> of the efficiency determined during calibration. If this <br /> is true, use the calibration efficiency value. If this is <br /> not truee <br />l <br />` 4.10.1 Use the value obtained in Step-4.9, if the difference <br /> between the source check and calibration efficiency <br />I <br />{ <br />1 <br />~c~y tio~ Dale issued Prepared By page ~ Or i <br /> tt J~ <br />