00000nam 2200000za 4500 9.864924 CaOODSP 20221107161656 cr ||||||||||| 181119s1981 onc #ot f|0| 0 eng d 0660110474 CaOODSP eng eng fre n-cn--- M38-13/81-11E-PDF M38-13/81-11E Steger, H. F. DH-la [electronic resource] : a certified uranium-thorium reference ore / by H. F. Steger, W. S. Bowman and G. Zechanowitsch. Ottawa : Energy, Mines and Resources Canada, 1981. iii, 14 p. : figures. CANMET report ; 81-11E Cover title. "September 1981." Includes bibliographic references. "A 122-kg sample of a uranium-thorium ore, DH-la, from Elliot Lake, Ontario, was prepared as a compositional reference material to replace the similar certified ore, DH-1, of which the stock had been exhausted. DR-la was ground to minus 74 11M, blended in one lot and bottled in 200-g units. The homogeneity of DH-la with respect to uran-ium was confirmed in CANMET using the volumetric-umpire method. The recommended value for uranium is based on the data from the confirmation of homogeneity. For thorium, twelve laboratories provided results in a "free-choice" analytical program. A statistical analysis of the data gave a recommended value of 0.263% for uranium and 0.091% for thorium"--Synopsis, p. i. Includes synopsis in French. gccst Minerals gccst Chemistry Zechanowitsch, G. Bowman, W. S. Canada. Energy, Mines and Resources Canada. CANMET report ; 81-11E. (CaOODSP)9.852792 PDF 1.27 MB https://publications.gc.ca/collections/collection_2018/rncan-nrcan/m38-13/M38-13-81-11-eng.pdf