constant describing the fractional decrease in the intensity of a beam of X-radiation as it passes through an absorbing medium Note 1 to entry: This is expressed in cm2/g. Note 2 to entry: The mass absorption coefficient is a function of the wavelength of the absorbed radiation and the atomic number of the absorbing element. powder sample analyte sample submitted as a powder for direct measurement in the sample cup precision closeness of agreement between independent test results obtained under stipulated conditions Note 1 to entry: Precision depends only on the distribution of random errors and does not relate to the true value or the specified value. Note 2 to entry: The measure of precision is usually expressed in terms of imprecision and computed as a standard deviation of the test results. Less precision is reflected by a larger standard deviation. Note 3 to entry: Quantitative measures of precision depend critically on the stipulated conditions. Repeatability and reproducibility conditions are particular sets of extreme conditions. [SOURCE: ISO 3534-2:2006, 3.3.4] pressed pellet analyte sample prepared by pressing milled material into a disk primary X-ray X-ray by which the sample is radiated quality control sample

constant describing the fractional decrease in the intensity of a beam of X-radiation as it passes through an absorbing medium Note 1 to entry: This is expressed in cm2/g. Note 2 to entry: The mass absorption coefficient is a function of the wavelength of the absorbed radiation and the atomic number of the absorbing element. powder sample analyte sample submitted as a powder for direct measurement in the sample cup precision closeness of agreement between independent test results obtained under stipulated conditions Note 1 to entry: Precision depends only on the distribution of random errors and does not relate to the true value or the specified value. Note 2 to entry: The measure of precision is usually expressed in terms of imprecision and computed as a standard deviation of the test results. Less precision is reflected by a larger standard deviation. Note 3 to entry: Quantitative measures of precision depend critically on the stipulated conditions. Repeatability and reproducibility conditions are particular sets of extreme conditions. [SOURCE: ISO 3534-2:2006, 3.3.4] pressed pellet analyte sample prepared by pressing milled material into a disk primary X-ray X-ray by which the sample is radiated quality control sample