A Statistical Review of DWPF Laboratory Data Including Measurements of the ARG-1 Standard for Batches 94 - 263.

THOMAS, EDWARDS

Savannah River Site (S.C.)

关键词: Calibration;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Processing;    Calibration Standards;    Tanks;   

DOI  :  10.2172/839496
RP-ID  :  WSRC-TR-2004-00576
RP-ID  :  AC09-96SR18500
RP-ID  :  839496

美国|英语

来源: UNT Digital Library

【 摘 要 】

Measurements of calibration and bench standards as well as samples of ARG-1 that were performed by the DWPF Lab during the processing of batches 94 through 263 were provided to SCS for review. Three datasets, one associated with each of three preparation methods (Cold Chem, Mixed Acid, and Fusion) were included in the review. The review conducted covered several areas of investigation. Biases in these measurements relative to the reference values for the standards including ARG-1 were estimated and found to be of no practical concern. Percent relative standard deviations for these data also were determined. Sources of variation in the measurements (i.e., batch-to-batch and within process batch) were estimated and compared. An investigation into evidence of instrument drift during a group of measurements representing a prototypical block was conducted for each preparation method using pairs of calibration and bench standards. No evidence of instrument drift at levels of practical concern was seen in these data. Also, the replicates of calibration standards at the beginning of each analytical block were found to be unnecessary. The uncertainties of the measurements, which incorporated biases and precision errors, were computed for the calibration standards, bench standards, and ARG-1. The limits for these uncertainties were compared to the current, LIMS operating limits for the errors in the measurements of these standards. These comparisons may provide opportunities for revising the LIMS limits. Comparisons between MFT and SME results were made for both the Mixed Acid and the Fusion prep methods. There was no evidence of differences (in either bias or precision) between the results for these two tanks for either of the two prep methods.