Advances in X-Ray Analysis: Volume 23 by C. G. Clayton, T. W. Packer (auth.), John R. Rhodes, PDF

By C. G. Clayton, T. W. Packer (auth.), John R. Rhodes, Charles S. Barret, Donald E. Leyden, John B. Newkirk, Paul K. Predecki, Clayton O. Ruud (eds.)

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VON ALFTHAN, P. RAUTALA, AND J. R. RHODES 32 rate I to element concentration C. 1 Ct.. 10 + L j The mathematical model used is Ct. •• lJ I. ij are the slope coefficients. The procedure for measuring and entering the Ct. coefficients is as follows. First the normalized count rates I are measured and noted for a suite of calibration standards. Then the Ct. coefficients are calculated off-line using any convenient calculator and mathematical procedure. Thirdly, the coefficients are entered via the thumbwhee1 switches.

G. Darnley and J. R. Rhodes, Trans. Instn. Mining Met. 2±, 361 (1965). J. R. Rhodes, Analyst 2l, 683 (1966). J. R. Rhodes and T. Furuta in "Advances in X-Ray Analysis", Vol. II, Eds. John B. Newkirk, Gavin R. Mallett and Heinz G. Pfeiffer, 249, Plenum Press, New York (1968). J. E. Trans. Nucl. , NS-25, 777 (1978). M. Hietala and J. Viitanen in "Advances in X-Ray Analysis", Vol. 21, Eds. C. S. Barrett, D. E. Leyden, J. B. Newkirk and C. O. Ruud, 193, Plenum Press, New York (1978). H. Sipila and E.

Powders were analyzed for 65 seconds also. Table 1a shows the reproducibility of the instrument for a given sample; these are readings taken over a period of one day. Table 1b shows a similar sample of Uranium loaded with Thorium showing the stability of the Uranium reading when measuring mixed deposits of U/Th. The measured detection limit for U is 19 ppm. RESULTS AND DISCUSSION Urani urn occurs, broadly speaking, in three main types of deposits (2,3,4). e. e. e. pitchblende vein type The type of deposit to be measured is significant in that the pattern of Uranium concentration within the sample will differ from one type to another and also interfering elements will have significantly different concentrations from deposit to deposit.

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