Duke Energy uses the Ludlum model 177 count rate meter with the Ludlum model 44-9 probe. Duke Energy recently learned that the Ludlum model 44-9 probe has a manufacturer stated dead time of 80 microseconds. This would yield a theoretical count rate loss of 67% at 500,000 cpm (the top of the X1K scale). Actual dead time measurements made by Duke Energy yielded slightly better results of 56% count rate loss at 500,000 cpm. Duke Energy would like to know the following:
1) Does your site or utility use the Ludlum model 177 count rate with the model 44-9 probe? 2) Do you have any kind of restriction on the X1K scale due to probe dead time? If so, what? 3) Do you perform any kind of dead time correction for the X1K scale during calibration? If so, what? 4) Do you perform any kind of dead time correction for the X1K scale for field measurements? If so, what? Thanks, Bill Faulkenberry, NRRPT Supervising Scientist, EnRad Labs Duke Energy [EnRad Logo.jpg] 13339 Hagers Ferry Rd Mail Stop MG03A2 Huntersville, NC 28078 Office: 980-875-6893 Mobile: 803-627-4832
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