In the present investigation, the variation in the external bremsstrahlung (EB) intensity produced due to the beta particles emitted by the 90 Sr-90 Y source in the elements Al, Cu, Ag, Sn, and Pb as well as some lead compounds was studied as a function of their masses per unit area. By a suitable regression analysis, two new, handy, and simple expressions for the effective atomic number of the radiator were derived in terms of the measured EB intensity. The novelty of the present method is that these expressions require either two different samples of the same mass per unit area or a single sample of two different masses per unit area for determining the effective atomic number. To check the efficacy of the method, from the measured EB intensity of the group of lead compounds, their effective atomic number was determined by making use of these expressions. The results were found to be in good agreement with the modified atomic number Z mod , calculated by using the theoretical expression of Markowicz and Van Grieken. This establishes the fact that this new method employs simple and very handy expressions which will be convenient particularly in the case of samples which are not abundantly available in nature.

-In this paper we show that the effective atomic number of amorphous materials which can be treated as pure incoherent scatterers can itself be used as a constant for normalizing the experimental Compton profiles. This finding is expected to be useful since calculation of the normalization constant by the usual procedure of integrating the Biggs et al. Compton profile values is a tedious task for composite materials. This method is applicable to pure incoherent scatterers of known as well as unknown composition.

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