The determination of mass attenuation coefficients for titanium, vanadium, iron, nickel, copper, praseodymium, gadolinium, and erbium / J.L. Dalton, Mineral Sciences Division.: M38-1/211-1969E-PDF

"Mass attenuation coefficients have been determined for titanium, vanadium, iron, nickel, copper, praseodymium, gadolinium, and erbium. The coefficients for the transition elements were measured over the range 17 keV to 2 keV and the rare earth elements over the range 28 keV to 5 keV. The precision of the measurements -- that is, the calculated relative sample standard deviation for all the replications for a single coefficient -- was less than one per cent in some cases, Agreement of the standard deviation predicted by the law of propagation of error with that obtained by measurement was achieved in favourable cases. Absorbing foils that were not ideally uniform accounted for discrepancies between the predicted and the actual standard deviations that occurred. The accuracy of the measurements is judged to be in the range two to four per cent of the mass attenuation coefficient reported. A statistical analysis of the data yielded constants and exponents making possible the calculation of mass attenuation coefficients in several atomic number-energy regions"--Abstract, page i.

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