Base calibration of Pacific Northwest Laboratory's gross gamma borehole geophysical logging system

1992 Yearly calibration of Pacific Northwest Laboratory's gross gamma-ray borehole geophysical logging system

“…The maximum absolute deviation of the tape depth from the indicateddepth was between 300 and 350 ft, amounting to 0.22 ft in 300 ft or 0.07% of the indicated depth. Such a deviation is similar to the error reported in the base calibrationreport (Brodeur and Koizumi 1989).…”

“…The base calibration report (Brodeur and Koizumi 1989) and the subsequent yearly calibration report (Arthur 1990 Figure I. A maximum error of 1.4% is found in the 30%-40% of full-scale region.…”

“…The two-source method described in the base calibration document (Brodeur and Koizumi 1989;Scott 1980) was used for the experiment. The exact dead-time correction is then obtained using a second formula.…”

1990 yearly calibration of Pacific Northwest Laboratory's gross-gamma borehole geophysical logging system

“…The dead-timecorrectionvalue was recomputed,in light of the scale and zero miscalibrationson the chart recorder,from the data given in Table 5 as taken from the basecalibration document (Brodeur and Koizumi 1989). The recomputeddead-timecorrectionwas 17.0± 2.5 microseconds_ The uncertainties associatedwith the dead-timevalues are based on acceptedpractices described in various texts dealingwith nuclear statistics (Evans 1955;Bevington 1969;Knoll 1979;Krugers 1973).…”

Field lysimeter studies for performance evaluation of grouted Hanford defense wastes

“…)-long thalliumdoped sodium iodide [NaI('Il)] detector. This system was field-checked annually; however, it was not formally calibrated until after its use in this study (PNL 1993;Brodeur and Koizumi 1989).…”