Open AccessMonitoring of direct chemical assay of fabricated parts
Author(s) -
Kenneth M. Harmon
Publication year - 1957
Language(s) - English
Resource type - Reports
DOI - 10.2172/90257
Subject(s) - subtraction , analysis of variance , plutonium , variance (accounting) , impurity , statistical analysis , statistics , partition (number theory) , mathematics , chemistry , analytical chemistry (journal) , chromatography , radiochemistry , arithmetic , organic chemistry , combinatorics , accounting , business
The specification for the plutonium content of fabricated parts requires that for each three-months production a statistical estimate be made of process variance (variation in actual plutonium content from part to part). Prior to the fourth quarter of 1956, this requirement was met by the following indirect technique: Chemical assay was made of at least one-half the parts produced; by-difference analysis (subtraction of the measured impurities from 100 per cent) was made of all parts produced; and the chemical assay and by-difference measurements were analyzed to permit partition of the observed, between-part variance in chemical assay results into process variance and analytical variance