A method has been devised for calculating the absorption factor for the powder method. It may be used for all values of μ r , where μ is the linear absorption coefficient and r the radius of the specimen. It is, however, especially suitable when μ r exceeds 2. For smaller values of μ r , for which the calculations are tedious and become less accurate, it is better to use Claassen's graphical method. By such a combination of the two methods a set of data was calculated for which the absorption factor may easily be obtained for any value of μ r and for any angle of reflection, with an error not exceeding 1 per cent. The data may also be applied for the calculation of the absorption factor in the lines belonging to the layer of zero order in rotation photographs.
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Andrew Bradley (1935) studied this question.
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